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Occupational Health and Safety Act
Loi sur la santé et la sécurité au travail

R.R.O. 1990, REGULATION 833

Amended to O. Reg. 388/00

CONTROL OF EXPOSURE TO BIOLOGICAL OR CHEMICAL AGENTS

Historical version for the period June 30, 2002 to April 20, 2004.

This Regulation is made in English only.

1. In this Regulation,

“exposure” means exposure by inhalation, ingestion or skin contact. R.R.O. 1990, Reg. 833, s. 1.

2. This Regulation does not apply at a project to an employer who primarily carries on the business of construction or to the workers of such an employer. R.R.O. 1990, Reg. 833, s. 2.

3. (1) Every employer shall take all measures reasonably necessary in the circumstances to protect workers from exposure to a hazardous biological or chemical agent because of the storage, handling, processing or use of such agent in the workplace. R.R.O. 1990, Reg. 833, s. 3 (1).

(2) The measures referred to in subsection (1) shall include the provision and use of engineering controls, work practices, hygiene facilities and practices and, subject to section 6, personal protective equipment. R.R.O. 1990, Reg. 833, s. 3 (2).

4. Without limiting the generality of section 3, but subject to section 9, every employer shall take the measures prescribed in that section to limit the daily and weekly exposure of workers to a biological or chemical agent listed in the Schedule to the concentration limit expressed as a time-weighted average exposure value, a short-term exposure value or a ceiling exposure value set out for the agent in the Schedule as determined in accordance with the methods set out in the Schedule. R.R.O. 1990, Reg. 833, s. 4.

5. In determining the exposure of workers to a hazardous biological or chemical agent under section 3 or 4, no regard shall be had to the wearing and use of personal protective equipment. R.R.O. 1990, Reg. 833, s. 5.

6. Except in the circumstances set out in sections 7 and 9, an employer shall protect workers from exposure to a hazardous biological or chemical agent without requiring the workers to wear and use personal protective equipment. R.R.O. 1990, Reg. 833, s. 6.

7. Where engineering controls required by this Regulation,

(a) are not in existence or are not obtainable;

(b) are not reasonable or not practical to adopt, install or provide because of the duration or frequency of the exposures or because of the nature of the process, operation or work;

(c) are rendered ineffective because of a temporary breakdown of such controls; or

(d) are ineffective to prevent, control or limit exposure because of an emergency,

the employer shall provide, and workers shall wear and use, personal protective equipment appropriate in the circumstances to protect the workers from exposure to a hazardous biological or chemical agent. R.R.O. 1990, Reg. 833, s. 7.

8. (1) Where a worker has been exposed to a hazardous biological or chemical agent and,

(a) the worker or the worker’s physician has reason to believe that the worker’s health has been affected by exposure to the agent and the worker or the worker’s physician has so notified the employer;

(b) the employer believes that the worker has been exposed to the agent, and the worker’s health is likely to be affected thereby and the employer has so notified the worker; or

(c) the Provincial Physician, Ministry of Labour so requires,

the worker, subject to subsection (2), shall at the expense of the employer undergo medical examinations and clinical tests to determine whether the worker has an occupational illness because of the exposure and whether the worker is fit, fit with limitations or unfit to continue working in such an exposure. R.R.O. 1990, Reg. 833, s. 8 (1); O. Reg. 513/92, s. 1.

(2) A notice under clause (1) (a) or (b) shall be in writing and a notice under clause (1) (b) shall notify the worker that the worker may dispute whether he or she must undergo medical examinations and clinical tests by giving notice of the dispute to an inspector. R.R.O. 1990, Reg. 833, s. 8 (2).

(3) Where a dispute arises between an employer and a worker under clause (1) (a) or (b) as to whether a worker must undergo medical examinations or clinical tests the employer or the worker may notify an inspector thereof who shall cause an investigation to be made and give a decision in writing to the employer and the worker. R.R.O. 1990, Reg. 833, s. 8 (3).

(4) The employer shall provide the physician who examines the worker or under whose supervision clinical tests are performed with a copy of the records, if any, of the exposure of the worker to the hazardous biological or chemical agent. R.R.O. 1990, Reg. 833, s. 8 (4).

9. (1) In this section,

“fibrous reinforcing agent” means an agent such as glass fibre or other fibrous substance used to strengthen a plastic material;

“plastic material” means a synthetic resinous polymeric substance that can be shaped or molded. R.R.O. 1990, Reg. 833, s. 9 (1).

(2) Every employer using styrene-based polyester resin in conjunction with a fibrous reinforcing agent to make or repair any goods, substance, article or thing, or part thereof, shall take all necessary measures and procedures by means of engineering controls, work practices and hygiene facilities and practices to ensure that the time-weighted average exposure of a worker to airborne styrene shall not exceed 100 parts styrene per million parts of air by volume, or 426 milligrams styrene per cubic metre of air. R.R.O. 1990, Reg. 833, s. 9 (2).

(3) Where subsection (2) applies, the employer shall provide a worker with respiratory equipment which shall be used by the worker if the time-weighted average exposure of a worker to airborne styrene is greater than 50 but less than 100 parts styrene per million parts of air by volume. R.R.O. 1990, Reg. 833, s. 9 (3).

(4) Despite subsection (2), an employer shall ensure that the exposure of a worker to styrene shall not exceed a short-term exposure concentration, measured over fifteen minutes, of 200 parts styrene per million parts of air by volume or 852 milligrams styrene per cubic metre of air. R.R.O. 1990, Reg. 833, s. 9 (4).

SCHEDULE
EXPOSURE VALUES FOR BIOLOGICAL AND CHEMICAL AGENTS IN WORKPLACES

Agents have been assigned to tables given in Parts 4 through 11 of the Schedule and reference should be made to the Index for the Part in which an agent appears.

Also, many of the agents’ names in the Schedule are based on the naming rules of the International Union of Pure and Applied Chemistry (IUPAC). Reference should be made to the Index for the cross-referencing of common names in IUPAC names.

TABLE OF CONTENTS

 

Part

Biological and Chemical Agents

 

Part 1 Revoked: O. Reg. 388/00, s. 3.

 

Calculation of Exposure Values

2A

Calculation of Exposure Values Where a STEV or CEV is Not Indicated

2B

Explanatory Notes on Chemical Names, CAS Reg. Nos., and Other Notations

3

Time-Weighted Average Exposure Values (TWAEV) and Short-Term Exposure Values (STEV) for Ceiling Exposure Values (CEV)

4

Part 5 Revoked: O. Reg. 388/00, s. 7.

 

Part 6 Revoked: O. Reg. 388/00, s. 7.

 

Part 7 Revoked: O. Reg. 388/00, s. 7.

 

Part 8 Revoked: O. Reg. 388/00, s. 7.

 

Exposure Values for Simple Asphyxiants

9

Known Toxic Agents for Which Exposure Values Have Not Been Established, and to Which Any Exposure Should be Avoided

10

Exposure Values for Acrylonitrile, Benzene and Mercury

11

PART 1 Revoked: O. Reg. 388/00, s. 3.

PART 2A CALCULATION OF EXPOSURE VALUES

_______________________________________________________

1. The time-weighted average exposure value (TWAEV) is the average of the airborne concentrations of a biological or chemical agent determined from air samples of the airborne concentrations to which a worker is exposed in a work day or a work week.

2. The short-term exposure value (STEV) is the maximum airborne concentration of a biological or chemical agent to which a worker is exposed in any fifteen-minute period determined from a single sample or a time-weighted average of sequential samples taken during such period.

3. The ceiling exposure value (CEV) is the maximum airborne concentration of a biological or chemical agent to which a worker is exposed at any time.

4. The airborne concentrations of the agent are expressed as parts of the agent per million parts of air by volume (ppm) or as milligrams of the agent per cubic metre of air (mg/m3).

5. Air sampling of the airborne concentrations of an agent is not required for the full period of a work day or a work week where the air sampling is representative of airborne concentrations of an agent likely to be present during the period.

6. The method of air sampling, the number and volume of the air samples and the method of analyses of the air samples shall be determined according to the nature of the operations or processes and the characteristics of the agent in accordance with recognized industrial hygiene practice.

7. In determining exposure to airborne concentrations of a biological or chemical agent, no regard shall be had or taken to the wearing or use by a worker of respiratory equipment.

8. The daily and weekly time-weighted exposure values shall be calculated as follows:

(a) C1T1 + C2T2 + ... + CnTn = cumulative daily or weekly exposure, where Ci is the concentration found in an air sample and Ti is the total time in hours to which the worker is taken to be exposed to concentration Ci in a work day or a work week for i taking on the values of 1, 2, ..., n.

(b) The time-weighted average exposure shall be calculated by dividing the cumulative daily exposure by 8 and the weekly exposure by 40 respectively.

9. For mixtures of airborne chemical agents which exert an additive health effect and when analytical results of individual airborne agents are available, the following formula shall be used:

where C1, C2, ... , Cn are the concentrations found in the air sample;

and L1, L2, ... , Ln are the respective exposure values for the agents set out in the Schedule.

The sum of these ratios, E, shall not exceed 1.

When calculating E for time-weighted average exposures, C shall be taken to be the time-weighted average exposure value calculated for each agent.

10. Paragraph 9 does not apply where the agents have widely different health effects. In such circumstances, independent exposure values for each agent shall be used and calculated in accordance with paragraph 8.

R.R.O. 1990, Reg. 833, Sched., Part 2A.

PART 2B CALCULATION OF EXPOSURE VALUES WHERE A STEV OR A CEV IS NOT INDICATED

_______________________________________________________

Where a STEV or a CEV is not set out for a biological or chemical agent listed in Part 4 of this Schedule, a worker shall not be exposed to a concentration of the biological or chemical agent that exceeds,

(a) three times the TWAEV set out in the Schedule for the agent for any period of 30 minutes, and

(b) five times the TWAEV set out in the Schedule for the agent for any period of time.

R.R.O. 1990, Reg. 833, Sched., Part 2B; O. Reg. 388/00, s. 4.

PART 3 EXPLANATORY NOTES ON CHEMICAL NAMES, CAS REG. NOS., AND OTHER NOTATIONS

_______________________________________________________

Parts 4, 9, 10 and 11 of this Schedule deal with biological and chemical agents and contain names of the agents, Chemical Abstracts Service Registry Numbers, and some notations.

Chemical Names

The chemical names used in this Schedule conform with nomenclature rules of the International Union of Pure and Applied Chemistry or with common usage. An agent will only be listed under one name and its other names (i.e.: generic, chemical, common, and trade) will be cross-referenced in the index.

Numerals and italicized prefixes (e.g.: o-, p-, n-, O-, N-, sec-, tert-) are disregarded when listing the main entries in alphabetical order, but are used to assign the order when main entry names are identical. For example, “N-methylaniline” is listed under “m”, and “sec-butyl acetate” precedes “tert-butyl acetate”.

Chemical Abstracts Service Registry Number

The Chemical Abstracts Service Registry Number (CAS Reg. No.) is a unique numerical identifier assigned to a chemical substance in the CAS registry system by the Chemical Abstracts Service (P.O. Box 3012, Columbus, Ohio, 43210). The CAS Reg. NO. itself has no chemical or structural significance; it is merely a computer-verifiable number assigned in sequential order to each agent as it is entered in the CAS registry system. Some of the CAS Reg. Nos. listed in this guide were assigned by the CAS under contract for the United States Environmental Protection Agency (U.S. EPA). CAS Reg. Nos. have been used as chemical or biological identifiers in inventories and computer literature-retrieval systems.

The CAS Reg. NO. has the format (xxxxxx-xx-x) and consists of up to 9 digits, separated by hyphens into 3 groups: (1) the first group has up to 6 digits; (b) the second always contains 2 digits; and (c) the third contains 1 digit.

Under the CAS Reg. NO. heading some entries other than the CAS Reg. NO. have been inserted; e.g., (a), (b), (c), as shown below:

   

Example: Agent

Symbol

Comment CAS Reg. No.

(a)

A CAS Reg. NO. has not been assigned.

Cotton dust, raw (a)

(b)

The CAS Reg. NO. is for the parent substance only. In the example given, cobalt is a parent compound. CAS Reg. Nos. have been assigned to individual compounds; e.g.: cobalt chloride.

Cobalt and its compounds (as cobalt) (7440-48-4), (b)

(c)

A CAS Reg. NO. exists but has not been included here because reference to the CAS Reg. NO. data base could be misleading.

Glass, fibrous or dust (c)

Notations

The notation “inhalable” following the name of an agent in this Schedule means that size fraction of the airborne particulate deposited anywhere in the respiratory tract and collected during air sampling with a particle size-selective device that,

(a) meets the American Conference of Governmental Industrial Hygienists (ACGIH) particle size-selective criteria; and

(b) has the cut point of 10 microns at 50 per cent collective efficiency.

The notation “respirable” following the name of an agent in this Schedule means that size fraction of the airborne particulate deposited in the gas-exchange region of the respiratory tract and collected during air sampling with a particle size-selective device that,

(a) meets the American Conference of Governmental Industrial Hygienists (ACGIH) particle size-selective criteria; and

(b) has the cut point of 4 microns at 50 per cent collective efficiency.

The notation “skin” following the name of an agent in this Schedule indicates that direct or airborne contact with the agents may result in significant absorption of the agent through the skin, mucous membranes or eyes. Vehicles, such as certain solvents, may enhance the rate of skin absorption. Inclusion of this notation is intended to suggest that preventative action should be taken against absorption of the agent through the skin, mucous membranes or eyes.

(As...)—In the lists of biological and chemical agents, the notation “(as...)”, e.g.: “nickel carbonyl (as nickel)”, is used to indicate that the agent is to be analyzed for the substance indicated in parentheses, nickel in this example, rather than nickel carbonyl.

R.R.O. 1990, Reg. 833, Sched., Part 3; O. Reg. 388/00, s. 5.

PART 4 TIME-WEIGHTED AVERAGE EXPOSURE VALUES (TWAEV), SHORT-TERM EXPOSURE VALUES (STEV) AND CEILING EXPOSURE VALUES (CEV)

AGENT

TWAEV

STEV

CEV

(CAS Reg. no)

ppm

mg/m3

ppm

mg/m3

ppm

mg/m3

Acetaldehyde

           

(75-07-0)

       

25

 

Acetate acid

           

(64-19-7)

10

25

15

37

   

Acetic anhydride

           

(108-24-7)

       

5

21

Acetone

           

(67-64-1)

500

 

750

     

Acetone cyanohydrin

           

(75-86-5), as CN — Skin

       

4.7

 

Acetonitrile

           

(75-05-8) — Skin

40

67

60

100

   

Acetophenone

           

(98-86-2)

10

         

2-(Acetyloxy) benzoic acid

           

(50-78-2)

5

   

Acrolein

           

(107-02-8)

       

0.1

 

Acrylamide

           

(79-06-1) — Skin

0.03

   

Acrylic acid

           

(79-10-7)

2

         

Adipic acid

           

(124-04-9)

 

5

       

Adiponitrile

           

(111-69-3) — Skin

2

         

Aldrin*

           

(309-00-2) — Skin

0.25

   

Allyl Alcohol

           

(107-18-6) — Skin

0.5

         

Allyl chloride

           

(107-05-1)

1

3

2

6

   

Allyl propyl disulfide

           

(2179-59-1)

2

12

3

18

   

alpha-Alumina (total dust)

           

(1344-28-1)

 

10

       

Aluminum-powder

           

(7429-90-5)

5

   

Aluminum, alkyl derivatives of

           

(7429-90-5), (b)

2

   

Aluminum, metal and oxide dust

           

(7429-90-5), (b)

10

   

Aluminum, water-soluble compounds of

           

(7429-90-5), (b)

2

   

2-Aminoethanol

           

(141-43-5)

3

7.5

6

15

   

2-Aminopyridine

           

(504-29-0)

0.5

2

   

3-Amino-1 H-1,2,4-triazole

           

(61-82-5)

0.2

   

4-Amino-3,5,6-trichloro-2-pyridinecarboxylic acid

           

(1918-02-1)

10

20

   

Ammonia

           

(7664-41-7)

25

17

35

24

   

Ammonium chloride fume

           

(12125-02-9)

10

20

   

Ammonium perfluoro-octanoate

           

(3825-26-1)

 

0.01

       

Ammonium sulfamate

           

(7773-06-0)

10

   

n-Amyl acetate

           

(628-63-7)

100

530

   

sec-Amyl acetate

           

(53496-15-4)

125

660

   

tert-Amyl methyl ether

           

(994-05-8)

250

1,045

310

1,295

   

Aniline and homologues

           

(62-53-3) — Skin

2

8

   

Anisidine (sum of o-, and p-isomers)

           

(29191-52-4) — Skin

0.1

0.5

   

Antimony and its compounds, including antimony trioxide handling and use, but excluding stibine (as antimony)

           

(7440-36-0), (b)

0.5

   

Antimony hydride

           

(7803-52-3)

0.1

0.5

   

Arsine

           

(7784-42-1)

0.05

0.16

   

Asphalt fumes

           

(8052-42-4)

 

5

       

Atrazine

           

(1912-24-9)

5

   

Azinphos-methyl

           

(86-50-0) — Skin

0.2

   

Barium carbonate, chloride, nitrate, or oxide (as barium)

           

(7440-39-3), (b)

0.5

   

Barium sulfate (total dust)

           

(7727-43-7)

 

10

       

Benomyl

           

(17804-35-2)

0.8

9

   

Benzaldehyde

           

(100-52-7)

   

4

17

   

1,2-Benzenedicarboxylic acid bis(2-ethylhexyl) ester

           

(117-81-7)

3

5

   

Benzenethiol

           

(108-98-5)

0.5

2.2

   

Benzotrichloride

           

(98-07-7) — Skin

       

0.1

 

Benzoyl chloride

           

(98-88-4)

       

0.5

 

Benzoyl peroxide

           

(94-36-0)

5

   

Benzyl acetate

           

(140-11-4)

10

         

Benzyl chloride

           

(100-44-7)

1

5

   

Beryllium and its compounds (as beryllium)

           

(7440-41-7)

 

0.002

 

0.01

   

Biphenyl

           

(92-52-4)

0.2

1.3

   

Bis(eta-cyclopentadienyl)iron

           

(102-54-5)

10

   

2,6-Bis(1,1-dimethylethyl)-4-methylphenol

           

(128-37-0)

10

   

Bis(2-(Dimethylaminoethyl)) ether

           

(3033-62-3)

5

33

       

Bis(Dimethylthiocarbonyl) disulfide

           

(137-26-8)

 

1

       

Bismuth telluride

           

(1304-82-1)

10

   

Bismuth telluride, selenium-doped

           

(1304-82-1), (b)

5

   

Borates, tetra, sodium salts

           

(1303-96-4), (b)

           

Anhydrous

1

   

Decahydrate

5

   

Pentahydrate

1

   

Boron oxide

           

(1303-86-2)

10

   

Boron tribromide

           

(10294-33-4)

       

1

10

Boron trifluoride

           

(7637-07-2)

       

1

2.8

Bromacil

           

(314-40-9)

 

10

       

Bromine

           

(7726-95-6)

0.1

 

0.2

     

Bromine pentafluoride

           

(7789-30-2)

0.1

0.7

   

Bromochloromethane

           

(74-97-5)

200

1,060

250

1,320

   

Bromoform

           

(75-25-2) — Skin

0.5

5

   

Bromotrifluoromethane

           

(75-63-8)

1,000

6,085

   

1,3-Butadiene

           

(106-99-0)

5

         

Butane

           

(106-97-8)

800

1,900

   

1-Butanethiol

           

(109-79-5)

0.5

1.8

   

2-Butanone

           

(78-93-3)

200

590

300

885

   

2-Butoxyethanol

           

(111-76-2) — Skin

20

         

2-Butoxyethyl acetate

           

(112-07-02) — Skin

25

164

75

492

   

(Butoxymethyl) oxirane

           

(2426-08-6)

25

133

   

n-Butyl acetate

           

(123-86-4)

150

710

200

950

   

sec-Butyl acetate

           

(105-46-4)

200

950

   

tert-Butyl acetate

           

(540-88-5)

200

950

   

n-Butyl acrylate

           

(141-32-2)

2

         

n-Butyl alcohol

           

(71-36-3) — Skin

       

50

150

sec-Butyl alcohol

           

(78-92-2)

100

303

150

454

   

tert-Butyl alcohol

           

(75-65-0)

100

303

150

454

   

n-Butyl lactate

           

(138-22-7)

5

30

   

n-Butylamine

           

(109-73-9) — Skin

       

5

15

o-sec-Butylphenol

           

(89-72-5) — Skin

5

31

   

p-tert-Butyltoluene

           

(98-51-1)

1

         

tert-Butyl chromate, (as chromate)

           

(1189-85-1) — Skin

         

0.1

. . . . .

           

Cadmium, elemental

           

(7440-43-9), and compounds, as Cd

 

0.01

       

Cadmium, elemental

           

(7440-43-9), and compounds, as Cd, respirable

 

0.002

       

. . . . .

           

Calcium carbonate, including marble (total dust)

           

(471-34-1)

 

10

       

Calcium Chloride

           

(10043-52-4)

 

5

       

Calcium chromate

           

(13765-19-0), as Cr

 

0.001

       

Calcium cyanamide

           

(156-62-7)

0.5

   

Calcium hydroxide

           

(1305-62-0)

5

   

Calcium oxide

           

(1305-78-8)

2

   

Calcium silicate

           

(total dust) (1344-95-2)

 

10

       

Calcium sulfate, including plaster of Paris (total dust)

           

(10101-41-4)

 

10

       

Camphor

           

(76-22-2)

2

12

3

19

   

Caprolactam, vapour and aerosol

           

(105-60-2)

0.25

1

   

Captafol

           

(2425-06-1) — Skin

0.1

   

Captan

           

(133-06-2)

5

   

Carbofuran

           

(1563-66-2)

0.1

   

Carbon black

           

(1333-86-4)

3.5

   

Carbon dioxide

           

(124-38-9)

5,000

9,000

30,000

54,000

   

Carbon disulfide

           

(75-15-0) — Skin

10

31

   

Carbon monoxide

           

(630-08-0)

35

40

400

460

   

Carbon tetrabromide

           

(558-13-4)

0.1

1.4

0.3

4.1

   

Carbon tetrachloride

           

(56-23-5) — Skin

2

13

3

19

   

Carbonyl chloride

           

(75-44-5)

0.1

0.4

   

Carbonyl fluoride

           

(353-50-4)

2

5.4

5

13

   

Cellulose (paper fiber, total dust)

           

(9004-34-6)

 

10

       

Cesium hydroxide

           

(21351-79-1)

2

   

Charcoal, except activated

           

(16291-96-6)

 

10

       

Chloracetaldehyde

           

(107-20-0)

       

1

3

Chlordane

           

(57-74-9) — Skin

0.5

2

   

Chlorinated diphenyl oxides

           

(55720-99-5)

 

0.5

 

2

   

Chlorine

           

(7782-50-5)

0.5

 

1

     

Chlorine dioxide

           

(10049-04-4)

0.1

0.3

0.3

0.9

   

Chlorine trifluoride

           

(7790-91-2)

       

0.1

0.4

Chloroacetone

           

(78-95-5)

       

1

 

Chloroacetyl chloride

           

(79-04-9)

0.05

 

0.15

     

Chlorobenzene

           

(108-90-7)

10

         

o-Chlorobenzaldehyde

           

(89-98-5)

   

4

23

   

o-Chlorobenzylidene malononitrile

           

(2698-41-1) — Skin

       

0.05

0.4

2-Chloro-1,3-butadiene

           

(126-99-8) — Skin

10

36

   

Chlorodifluoromethane

           

(75-45-6)

1,000

3,535

1,250

4,415

   

1-Chloro-2,3-epoxypropane

           

(106-89-8) — Skin

0.5

         

2-Chloroethanol

           

(107-07-3) — Skin

       

1

3.3

p-Chloronitrobenzene

           

(100-00-5)

0.1

0.6

   

1-Chloro-1-Nitropropane

           

(600-25-9)

2

10

   

Chloropentafluoroethane

           

(76-15-3)

1,000

6,315

   

2-Chloro-1-phenylethanone

           

(532-27-4)

0.05

0.32

   

2-Chloropropionic acid

           

(598-78-7) — Skin

0.1

         

o-Chlorostyrene

           

(2039-87-4)

50

283

75

425

   

o-Chlorotoluene

           

(95-49-8)

50

260

75

388

   

2-Chloro-6-(trichloro-methyl)pyridine

           

(1929-82-4)

10

20

   

Chlorpyrifos

           

(2921-88-2) — Skin

0.2

0.6

   

Chromates, dichromates and other hexavalent chromium compounds (as chromium)

           

(7440-47-3), (b)

0.05

   

Chromium

           

(7440-47-3), Insoluble Cr VI compounds, as Cr (b)

 

0.01

       

Chromium metal, and divalent and trivalent chromium compounds (as chromium)

           

(7440-47-3), (b)

0.5

   

Chromyl chloride

           

(14977-61-8)

0.025

0.16

   

Clopidol

           

(2971-90-6)

10

20

   

Coal dust, Anthracite (respirable)

 

0.4

       

Coal dust, Bituminous (respirable)

 

0.9

       

Coal tar pitch volatiles (as total benzene-soluble compounds)

           

(65996-93-2)

 

0.2

       

Cobalt carbonyl and hydrocarbonyl (as cobalt)

           

(7440-48-4), (b)

0.1

   

Cobalt metal, dust and fume (as cobalt)

           

(7440-48-4)

 

0.02

       

N-Coco Morpholine

           

(1541-81-7) — Skin

5

52

       

Copper fume (as copper)

           

(7440-50-8), (b)

0.2

   

Copper dust and mists (as copper)

           

(7440-50-8), (b)

1

   

Cotton Dust, Fabric Knitting

 

0.5

       

Cotton dust, raw

           

(a)

0.2

   

Cotton Dust, Slashing and Weaving

 

0.75

       

Cotton Dust, Waste

 

0.5

       

‘Coumin 100’ Polymer Flakes (total dust)

           

(63393-89-5)

 

5

       

Cresol (sum of o-, m-, and p-isomers)

           

(1319-77-3) — Skin

5

22

   

Crotonaldehyde

           

(4170-30-3)

       

0.3

 

Crufomate

           

(299-86-5)

5

20

   

Cumene

           

(98-82-8) — Skin

50

245

   

Cyanamide

           

(420-04-2)

2

   

. . . . .

           

Cyanogen

           

(460-19-5)

10

21

   

Cyanogen chloride

           

(506-77-4)

       

0.3

0.75

Cyclohexane

           

(110-82-7)

300

1,030

   

Cyclohexanol

           

(108-93-0) — Skin

50

200

   

Cyclohexanone

           

(108-94-1) — Skin

25

100

   

Cyclohexene

           

(110-83-8)

300

1,010

   

Cyclohexylamine

           

(108-91-8)

10

40

   

Cyclopentadiene

           

(542-92-7)

75

200

   

Cyclopentane

           

(287-92-3)

600

1,720

   

Cyhexatin

           

(13121-70-5)

5

   

Cymene (sum of o-,m- and p-isomers)

           

(25155-15-1) — Skin

50

274

       

Decaborane

           

(17702-41-9) — Skin

0.05

0.25

0.15

0.75

   

Demeton

           

(8065-48-3) — Skin

0.01

0.11

   

1,2-Diaminoethane

           

(107-15-3)

10

25

   

Diatomaceous earth, (uncalcined) inhalable

           

(61790-53-2)

 

10(D)

       

Diatomaceous earth (uncalcined) respirable

           

(61790-53-2)

 

3(D)

       

Diazomethane

           

(334-88-3)

0.2

0.34

   

Diborane

           

(19287-45-7)

0.1

0.11

   

Dibromodifluoromethane

     

   

(75-61-6)

100

860

     

2-(Dibutylamino) ethanol

           

(102-81-8) — Skin

0.5

         

Dibutyl phenyl phosphate

           

(2528-36-1) — Skin

0.3

         

Dibutyl phosphate

           

(107-66-4)

1

8.6

2

17

   

Dibutyl phthalate

           

(84-74-2)

5

   

o-Dichlorobenzene

           

(95-50-1)

25

 

50

     

p-Dichlorobenzene

           

(106-46-7)

10

         

Dichlorodifluoromethane

           

(75-71-8)

1,000

4,940

   

1,4-Dichloro-2-butene

           

(764-41-0) — Skin

0.005

         

1,3-Dichloro-5,5-dimethyl-hydantoin

           

(118-52-5)

0.2

0.4

   

1, 3-Dichloro-2-Propanol

           

(96-23-1) — Skin

   

1

5

   

1,1-Dichloroethane

           

(75-34-3)

100

         

1,2-Dichloroethane

           

(107-06-2)

10

40

   

1,1-Dichloroethene

           

(75-35-4)

1

4

20

80

   

1,2-Dichloroethene

           

(540-59-0)

200

790

250

990

   

Dichloroethyne

           

(7572-29-4)

       

0.1

0.4

Dichlorofluoromethane

           

(75-43-4)

10

42

   

Dichloromethane

           

(75-09-2)

50

175

   

1,1-Dichloro-1-nitroethane

           

(594-72-9)

2

12

   

(2,4-Dichlorophenoxy) acetic acid and its esters (as 2,4-D)

           

(94-75-7), (b)

10

   

2-(2,4-Dichlorophenoxy) ethanol hydrogen sulfate sodium salt

           

(136-78-7)

10

   

1,2-Dichloropropane

           

(78-87-5)

75

350

110

510

   

1,3-Dichloropropene

           

(542-75-6) — Skin

1

5

   

2,2-Dichloropropionic acid

           

(75-99-0)

1

6

   

1,2-Dichloro-1,1,2,2-tetra-fluoroethane

           

(76-14-2)

1,000

6,985

   

Dichlorvos

           

(62-73-7) — Skin

0.1

0.9

   

Dicrotophos

           

(141-66-2) — Skin

0.25

   

Dicyclopentadiene

           

(77-73-6)

5

27

   

Dieldrin

           

(60-57-1) — Skin

0.25

   

Diethanolamine

           

(111-42-2)

 

2

       

Diethylamine

           

(109-89-7)

5

 

15

     

2-(Diethylamino)ethanol

           

(100-37-8) — Skin

2

         

Diethylene glycol monoethyl ether

           

(111-90-0)

30

165

       

Diethylenetriamine

           

(111-40-0) — Skin

1

4

   

Diethyl phthalate

           

(84-66-2)

5

   

1,2-Dihydroxybenzene

           

(120-80-9)

5

22

   

1,4-Dihydroxybenzene

           

(123-31-9)

2

   

Diisodecyl phthalate

           

(26761-40-0)

 

5

       

Diisopropylamine

           

(108-18-9) — Skin

5

20

   

Dimethoxymethane

           

(109-87-5)

1,000

3,110

   

N,N-Dimethylacetamide

           

(127-19-5) — Skin

10

36

   

Dimethylamine

           

(124-40-3)

5

 

15

     

3-(Dimethylamino) propylamine

           

(111-90-0) — Skin

0.5

2

       

N,N-Dimethylaniline

           

(121-69-7) — Skin

5

25

10

50

   

ar,ar-Dimethylbenzenamine (sum of all isomers)

           

(1300-73-8) — Skin

0.5

         

Dimethylbenzene (sum of o-, m- and p-isomers)

           

(1330-20-7)

100

435

150

650

   

N, N-Dimethyl-cyclohexylamine

           

(98-94-2)

   

5

26

   

Dimethylethoxysilane

           

(14857-34-2)

0.5

 

1.5

     

N, N-Dimethyl-ethanolamine

           

(108-01-0)

3

11

6

22

   

N,N-Dimethylformamide

           

(68-12-2) — Skin

10

30

   

2,6-Dimethyl-4-heptanone

           

(108-83-8)

25

145

   

1,1-Dimethylhydrazine

           

(57-14-7) — Skin

0.01

         

2-(2,2-Dimethyl-1-oxopropyl)-H-indene-1,3(2H)-dione

           

(83-26-1)

0.1

   

Dimethyl phthalate

           

(131-11-3)

5

   

Dimethyl sulfate

           

(77-78-1) — Skin

0.1

0.5

   

Dimethyl terephthalate

           

(120-61-6)

 

5

       

Dimethyl 2,3,5,6-tetracholorotere-phthalate

           

(1861-32-1)

 

5

       

Dinitrobenzene (sum of m-, o-, and p-isomers:

           

(99-65-0), (528-29-0), and (100-25-4)) — Skin

0.15

1.0

   

Dinitro-o-cresol

           

(534-52-1) — Skin

0.2

   

Dinitrotoluene (sum of all isomers)

           

(25321-14-6) — Skin

 

0.2

       

1,4-Dioxane

           

(123-91-1) — Skin

20

         

Dioxathion

           

(78-34-2) — Skin

0.2

   

N,N-Diphenylamine

           

(122-39-4)

10

   

Dipropylene glycol monomethyl ether

           

(34590-94-8)

100

605

150

910

   

Dipropylene glycol monomethyl ether acetate

           

(88917-22-0)

100

776

150

1,164

   

. . . . .

           

Diquat

           

(2764-72-9) — Skin

 

0.5

       

Diquat, respirable

           

(2764-72-9) — Skin

 

0.1

       

Disulfiram

           

(97-77-8)

2

   

Disulfoton

           

(298-04-4)

0.1

   

Diuron

           

(330-54-1)

10

   

m-Divinylbenzene

           

(108-57-6)

10

53

   

Emery (total dust)

           

(57407-26-8)

 

10

       

Endosulfan

           

(115-29-7) — Skin

0.1

   

Endrin*

           

(72-20-8) — Skin

0.1

   

Enflurane

           

(13838-16-9)

2

16

   

1,2-Epoxy-4-(epoxyethyl)-cyclohexane

           

(106-87-6) — Skin

0.1

         

1,2-Epoxypropane

           

(75-56-9)

20

47

   

2,3-Epoxy-1-propanol

           

(556-52-5)

2

         

Ethanethiol

           

(75-08-1)

0.5

1.3

   

Ethanol

           

(64-17-5)

1,000

1,900

   

Ethion

           

(563-12-2) — Skin

0.4

   

Ethoxyethane

           

(60-29-7)

400

1,210

500

1,515

   

2-Ethoxyethanol

           

(110-80-5) — Skin

5

18

   

2-Ethoxyethyl acetate

           

(111-15-9) — Skin

5

27

   

Ethyl acetate

           

(141-78-6)

400

1,440

   

Ethyl acrylate

           

(140-88-5) — Skin

5

 

15

     

Ethylamine

           

(75-04-7)

5

 

15

     

Ethylbenzene

           

(100-41-4)

100

435

125

540

   

Ethyl bromide

           

(74-96-4)

5

         

Ethyl chloride

           

(75-00-3)

100

         

Ethyl cyanoacrylate

           

(7085-85-0)

0.2

         

Ethyl-3-ethoxy propionate

           

(763-69-9)

50

300

       

Ethylene glycol

           

(107-21-1)

         

100

Ethylene glycol dimethyl ether

           

(110-71-4) — Skin

5

18

       

Ethylene glycol dinitrate

           

(628-96-6) — Skin

0.05

0.31

   

Ethylene glycol mono-n-propyl ether

           

(2807-30-9) — Skin

25

110

       

Ethylene glycol mononitrate

           

(16051-48-2) — Skin

0.05

0.22

       

5-Ethylidene-2-norbornene

           

(16219-75-3)

       

5

25

Ethylenimine

           

(151-56-4) — Skin

0.5

0.9

   

Ethyl formate

           

(109-94-4)

100

300

   

Ethyl methacrylate

           

(97-63-2)

100

470

       

N-Ethylmorpholine

           

(100-74-3) — Skin

5

23

   

O-Ethyl O-p-nitrophenyl phenylphosphonothioate

           

(2104-64-5) — Skin

 

0.1

       

Ethyl silicate

           

(78-10-4)

10

85

   

Fenamiphos

           

(22224-92-6) — Skin

0.1

   

Fensulfothion

           

(115-90-2)

0.1

   

Fenthion

           

(55-38-9) — Skin

0.1

   

Ferbam

           

(14484-64-1)

10

   

Ferrovanadium dust

           

(12604-58-9)

1

3

   

Fluorides (as fluoride)

           

(16984-48-8), (b)

2.5

   

Fluorine

           

(7782-41-4)

1

1.6

2

3.1

   

Fonofos

           

(944-22-9) — Skin

0.1

   

Forane

           

(26675-46-7)

2

15

       

Formaldehyde

           

(50-00-0)

1

1.5

2

3

   

Formamide

           

(75-12-7) — Skin

10

15

   

Formic acid

           

(64-18-6)

5

 

10

     

Furfural

           

(98-01-1) — Skin

2

8

   

Furfuryl alcohol

           

(98-00-0) — Skin

10

40

15

60

   

Gasoline

           

(8006-61-9)

 

900

 

1,500

   

Germanium tetrahydride

           

(7782-65-2)

0.2

0.63

   

. . . . .

           

Glycerin mist

           

(56-81-5)

 

10

       

Glutaraldehyde

           

(111-30-8), activated and inactivated

       

0.05

 

Grain dust (oats, wheat, barley)

           

(a)

4

   

Grain Dust, Not Otherwise Classified (total dust)

 

4

       

Graphite (all forms except graphite fibers), respirable

           

(7782-42-5)

 

2

       

Gypsum (total dust)

           

(10101-41-4)

 

10

       

Hafnium

           

(7440-58-6)

0.5

   

Halothane

           

(151-67-7)

2

16

   

. . . . .

           

Heptachlor

           

(76-44-8) and Heptachlor epoxide (1024-57-3) — Skin

 

0.05

       

n-Heptane

           

(142-82-5)

400

1,635

500

2,045

   

2-Heptanone

           

(110-43-0)

25

115

   

3-Heptanone

           

(106-35-4)

50

 

75

     

4-Heptanone

           

(123-19-3)

50

233

   

Heptyl Acetate

           

(90438-79-2)

50

320

       

Hexachlorobenzene

           

(118-74-1) — Skin

 

0.002

       

Hexachloro-1,3-butadiene

           

(87-68-3) — Skin

0.02

0.21

   

Hexachlorocyclopentadiene

           

(77-47-4)

0.01

0.11

   

Hexachloroethane

           

(67-72-1)

1

         

Hexachloronaphthalene

           

(1335-87-1) — Skin

0.2

   

Hexafluoroacetone

           

(684-16-2) — Skin

0.1

0.7

   

Hexahydro-1,3,5-trinitro-1,3,5-triazine

           

(121-82-4) — Skin

 

0.5

       

Hexamethylenetetramine (HMT)

           

(100-97-0)

   

0.35

2

   

n-Hexane

           

(110-54-3)

50

176

   

Hexane, other isomers of

500

1,760

1,000

3,520

   

1,6-Hexanediamine

           

(124-09-4)

0.5

         

2-Hexanone

           

(591-78-6)

1

4

   

1-Hexene

           

(592-41-6)

30

         

sec-Hexyl acetate

           

(142-92-7)

50

294

   

Hexyl Acetate (isomeric mixture)

           

(88230-35-7)

50

294

       

Hexylene glycol

           

(107-41-5)

       

25

120

Hydrazine

           

(302-01-2) — Skin

0.01

         

Hydrogenated terphenyls1

           

(61788-32-7)

0.5

         

Hydrogen bromide

           

(10035-10-6)

       

3

10

Hydrogen chloride

           

(7647-01-0)

       

5

7.4

Hydrogen cyanide and Cyanide salts, as CN

           

Hydrogen cyanide

           

(74-90-8) — Skin

       

4.7

 

Calcium cyanide

           

(592-01-8) — Skin

         

5

Potassium cyanide

           

(151-50-8) — Skin

         

5

Sodium cyanide

           

(143-33-9) — Skin

         

5

Hydrogen fluoride (as fluoride)

           

(7664-39-3)

       

3

2.5

Hydrogen peroxide (90%)

           

(7722-84-1)

1

1.4

   

Hydrogen selenide (as selenium)

           

(7783-07-5)

0.05

0.16

   

Hydrogen sulfide

           

(7783-06-4)

10

14

15

21

   

4-Hydroxy-4-methyl-2-pentanone

           

(123-42-2)

50

240

75

360

   

2-Hydroxypropyl acrylate

           

(999-61-1) — Skin

0.5

2.7

   

Indene

           

(95-13-6)

10

47

   

Indium and its compounds (as indium)

           

(7440-74-6), (b)

0.1

   

Iodine

           

(7553-56-2)

       

0.1

1

Iodoform

           

(75-47-8)

0.6

10

   

Iron oxide dust and fumes (Fe2O3), as Fe

           

(1309-37-1)

 

5(D)

       

Iron pentacarbonyl (as iron)

           

(13463-40-6)

0.1

0.8

0.2

1.6

   

Iron salts, water-soluble (as iron)

           

(7439-89-6), (b)

1

   

Isoamyl acetate

           

(123-92-2)

100

530

   

Isoamyl alcohol

           

(123-51-3)

100

360

125

450

   

Isobutyl acetate

           

(110-19-0)

150

710

187

887

   

Isobutyl alcohol

           

(78-83-1)

50

150

   

Isooctyl alcohol

           

(26952-21-6) — Skin

 

270

       

2-Isopropoxyethanol

           

(109-59-1)

25

105

   

Isopropyl acetate

           

(108-21-4)

250

1,040

310

1,295

   

Isopropyl alcohol

           

(67-63-0)

400

980

500

1,225

   

Isopropylamine

           

(75-31-0)

5

12

10

24

   

Isopropylaminoethanols

   

400

1,900

   

N-Isopropylaniline

           

(768-52-5) — Skin

2

11

   

Isosorbide Dinitrate

           

(87-33-2) — Skin

 

0.2

       

Kaolin (respirable)

           

(1332-58-7)

 

2(D)

       

Kerosene, straight-run (8008-20-6) and hydrosulfurized

           

(64742-81-0))

35

250

       

Ketene

           

(463-51-4)

0.5

0.9

1.5

2.6

   

L.P.G. (Liquified petroleum gas)

           

(68476-85-7)

 

1,800

       

Lead chromate

           

(7758-97-6), as Cr

 

0.012

       

Limestone (total dust)

           

(1317-65-3)

 

10(D)

       

Lincomycin

           

(154-21-2)

 

0.1

       

Lindane

           

(58-89-9) — Skin

0.5

   

Lithium hydride

           

(7580-67-8)

0.025

   

Lithium Hydroxide, Anyhydrous

           

(1310-65-2)

     

1

   

Lithium Hydroxide, Monohydrate

           

(1310-66-3)

     

1

   

Magnesite (total dust)

           

(546-93-0)

 

10(D)

       

Magnesium oxide fume

           

(1309-48-4)

10

   

Malathion

           

(121-75-5) — Skin

10

   

Maleic anhydride

           

(108-31-6)

0.25

1

   

Manganese, dust and compounds (as manganese)

           

(7439-96-5), (b)

5

   

Manganese-containing fume (as manganese)

           

(7439-96-5), (b)

1

3

   

Manganese cyclo-pentadienyltricarbonyl (as manganese)

           

(12079-65-1) — Skin

0.1

   

Manganese tetroxide (as manganese)

           

(1317-35-7) — Skin

1

   

Mesityl oxide

           

(141-79-7)

15

60

25

100

   

Methacrylic acid

           

(79-41-4)

20

70

   

Methanethiol

           

(74-93-1)

0.5

1

   

Methanol

           

(67-56-1) — Skin

200

260

250

325

   

Methomyl

           

(16752-77-5)

2.5

   

Methoxychlor

           

(72-43-5)

10

   

2-Methoxyethanol

           

(109-86-4) — Skin

5

16

   

2-Methoxyethyl acetate

           

(110-49-6) — Skin

5

24

   

Methoxyflurane

           

(76-38-0)

2

13

       

4-Methoxyphenol

           

(150-76-5)

5

   

1-Methoxy-2-propanol

           

(107-98-2)

100

365

150

550

   

Methyl acetate

           

(79-20-9)

200

605

250

755

   

Methyl acetylene-propadiene mixture (MAPP)

1,000

 

1,250

     

Methyl acrylate

           

(96-33-3) — Skin

2

         

Methylamine

           

(74-89-5)

5

 

15

     

N-Methylbenzenamine

           

(100-61-8) — Skin

0.5

2.2

   

Methylbenzene

           

(108-88-3)

50

         

Methyl bromide

           

(74-83-9) — Skin

1

         

3-Methyl-2-butanone

           

(563-80-4)

200

705

   

Methyl chloride

           

(74-87-3)

50

103

100

205

   

Methyl 2-cyanoacrylate

           

(137-05-3)

0.2

         

Methylcyclohexane

           

(108-87-2)

400

1,600

   

2-Methylcyclohexanol

           

(583-59-5)

50

233

   

2-Methylcyclohexanone

           

(583-60-8) — Skin

50

230

75

345

   

2-Methylcyclopentadienyl-manganese tricarbonyl (as manganese)

           

(12108-13-3) — Skin

0.2

   

Methyl demeton

           

(8022-00-2) — Skin

0.5

   

2-Methyl-3,5-dinitrobenzamide

           

(148-01-6)

5

10

   

Methylene bis (4-cyclohexyl isocyanate)

           

(5124-30-1)

0.005

         

4,4´-Methylenebis-(2-chloroaniline)

           

(101-14-4) — Skin

0.0005

0.005

   

4,4´-Methylene-dianiline

           

(101-77-9) — Skin

0.04

   

((1-Methylethoxy)methyl)-oxirane

           

(4016-14-2)

50

237

75

356

   

Methyl ethyl ketone peroxides (a)

       

0.2

1.5

Methyl formate

           

(107-31-3)

100

245

150

370

   

5-Methyl-3-heptanone

           

(541-85-5)

25

130

   

5-Methyl-2-hexanone

           

(110-12-3)

50

233

   

Methylhydrazine

           

(60-34-4) — Skin

0.01

         

Methyl iodide

           

(74-88-4) — Skin

2

12

   

Methyl methacrylate

           

(80-62-6)

100

410

   

Methyl parathion

           

(298-00-0) — Skin

0.2

   

4-Methyl-2-pentanol

           

(108-11-2) — Skin

25

104

40

167

   

4-Methyl-2-pentanone

           

(108-10-1)

50

205

75

305

   

2-Methyl-2-propenenitrile

           

(126-98-7) — Skin

1

2.7

   

N-Methyl-2-pyrrolidone

           

(872-50-4)

 

400

       

alpha-Methylstyrene

           

(98-83-9)

50

241

100

482

   

Methyl tert-butyl ether (MTBE)

           

(1634-04-4)

40

         

1-Methyl-2,4,6-trinitrobenzene

           

(118-96-7) — Skin

0.01

0.1

0.02

0.2

   

Methyl vinyl ketone

           

(78-94-4) — Skin

       

0.2

 

Metribuzin

           

(21087-64-9)

5

   

Mevinphos

           

(7786-34-7) — Skin

0.01

0.1

0.03

0.3

   

Mica, respirable

           

(12001-26-2)

 

3(D)

       

Mineral Spirits

 

525

       

Molybdenum metal, dioxide and disulfide (as molybdenum)

           

(7439-98-7), (b)

10

   

Molybdenum trioxide and molybdates (as molybdenum)

           

(7439-98-7), (b)

5

   

Monocrotophos

           

(6923-22-4)

0.25

   

Morpholine

           

(110-91-8) — Skin

20

70

30

105

   

Naled

           

(300-76-5) — Skin

3

   

Naphthalene

           

(91-20-3)

10

52

15

78

   

1-Naphthyl N-methyl-carbamate

           

(63-25-2)

5

   

alpha-Naphthylthiourea

           

(86-88-4)

0.3

   

Nepheline Syenite (total dust)

           

(37244-96-5)

 

10

       

. . . . .

           

Nickel carbonyl (as nickel)

           

(13463-39-3)

0.05

0.35

   

Nickel, elemental/metal

           

(7440-02-0), inhalable

 

1

       

Nickel, insoluble compounds, as Ni, inhalable

           

(7440-02-0)

 

0.2

       

Nickel, soluble compounds, as Ni, inhalable

           

(7440-02-0)

 

0.1

       

Nickel subsulfide, inhalable

           

(12035-72-2), as Ni

 

0.1

       

. . . . .

           

Nicotine

           

(54-11-5) — Skin

0.5

   

Nitramine

           

(479-45-8) — Skin

1.5

   

Nitric acid

           

(7697-37-2)

2

5

4

10

   

Nitric oxide

           

(10102-43-9)

25

31

   

p-Nitroaniline

           

(100-01-6) — Skin

3

   

Nitrobenzene

           

(98-95-3) — Skin

1

5

   

Nitroethane

           

(79-24-3)

100

306

   

Nitrogen dioxide

           

(10102-44-0)

3

5.6

5

9.4

   

Nitrogen trifluoride

           

(7783-54-2)

10

29

   

Nitroglycerine

           

(55-63-0) — Skin

0.05

0.5

   

Nitromethane

           

(75-52-5)

20

         

1-Nitropropane

           

(108-03-2)

25

90

   

2-Nitropropane

           

(79-46-9)

1

35

20

70

   

Nitrotoluene (sum of m-, o-, and p-isomers:

           

(99-08-1), (88-72-2), and (99-99-0)) — Skin

2

11

   

Nitrous oxide

           

(10024-97-2)

25

45

   

Nonane

           

(111-84-2)

200

1,050

   

Octachloronaphthalene

           

(2234-13-1) — Skin

0.1

0.3

   

Octane

           

(111-65-9)

300

1,400

375

1,750

   

Oil, mineral — Mist

           

(8012-95-1)

 

5

 

10

   

Osmium tetroxide (as osmium)

           

(20816-12-0)

0.0002

0.002

0.0006

0.006

   

Oxalic acid

           

(144-62-7)

1

2

   

1,1´-Oxybisbenzene

           

(101-84-8)

1

7

2

14

   

1,1´-Oxybis(2-chloroethane)

           

(111-44-4) — Skin

5

29

10

58

   

Oxybis (chloromethane)

           

(542-88-1)

0.001

0.005

   

2,2´-(Oxybis(methylene))-bisoxirane

           

(2238-07-5)

0.1

0.53

   

2,2´-Oxybis(propane)

           

(108-20-3)

250

1,045

310

1,295

   

Oxygen difluoride

           

(7783-41-7)

       

0.05

0.1

Ozone

           

(10028-15-6)

0.1

0.2

0.3

0.6

   

Paraffin wax fume

           

(8002-74-2)

 

2

       

Paraquat

           

(1910-42-5)

0.1

   

Parathion

           

(56-38-2) — Skin

0.05

   

Particulates (insoluble) Not Otherwise Classified (PNOC)

           

inhalable particulate

 

10(D)

       

respirable particulate

 

3(D)

       

Penicillin (total dust)

           

(1406-05-9)

 

0.1

       

Pentaborane

           

(19624-22-7)

0.005

0.013

0.015

0.039

   

Pentachloronaphthalene

           

(1321-64-8)

0.5

   

Pentachloronitrobenzene

           

(82-68-8)

 

0.5

       

Pentachlorophenol

           

(87-86-5) — Skin

0.5

   

Pentaerythritol (total dust)

           

(115-77-5)

 

10

       

Pentaerythritol tetrabenzoate

           

(4196-86-5)

     

2

   

Pentane

           

(109-66-0)

600

1,770

750

2,210

   

2-Pentanone

           

(107-87-9)

200

700

250

880

   

3-Pentanone

           

(96-22-0)

200

 

300

     

Perchloryl fluoride

           

(7616-94-6)

3

13

6

25

   

Perlite (a)

 

10(D)

       

Perfluoroisobutylene

           

(382-21-8)

       

0.01

 

. . . . .

           

Persulfates, ammonium (7727-54-1), sodium (7775-27-1) and potassium persulfates (7727-21-1)

 

0.1

       

Petroleum Ether

 

500

       

Petroleum Coke (total dust)

           

(64741-79-3) (A)

 

3.5

       

Phenol

           

(108-95-2) — Skin

5

19

   

Phenothiazine

           

(92-84-2) — Skin

5

   

2-Phenoxyethanol

           

(122-99-6) — Skin

25

141

       

(Phenoxymethyl)oxirane

           

(122-60-1)

0.1

         

o-Phenylenediamine

           

(95-54-5)

 

0.1

       

m-Phenylenediamine

           

(108-45-2)

 

0.1

       

p-Phenylenediamine

           

(106-50-3) — Skin

0.1

   

Phenylhydrazine

           

(100-63-0) — Skin

0.1

         

Phenylphosphine

           

(638-21-1)

       

0.05

0.23

Phorate

           

(298-02-2) — Skin

0.05

0.2

   

Phosphine

           

(7803-51-2)

0.3

0.4

1

1.4

   

Phosphoric acid

           

(7664-38-2)

1

3

   

Phosphorothionic acid 0,0-diethyl 0-(6-methyl)-2-(1-methylethyl)-4-pyrimidinyl)ester

           

(333-41-5) — Skin

0.1

   

Phosphorus (yellow or white)

           

(7723-14-0)

0.1

   

Phosphorus oxychloride

           

(10025-87-3)

0.1

0.6

0.5

3

   

Phosphorus pentachloride

           

(10026-13-8)

0.1

0.85

   

Phosphorus pentasulfide

           

(1314-80-3)

1

3

   

Phosphorus trichloride

           

(7719-12-2)

0.2

1.1

0.5

2.8

   

Phthalic anhydride

           

(85-44-9)

1

6

   

m-Phthalodinitrile

           

(626-17-5)

5

   

Piperazine dihydrochloride

           

(142-64-3)

5

   

Platinum metal

           

(7440-06-4)

1

   

Platinum, water-soluble compounds of, including chloroplatinates (as platinum)

           

(7440-06-4), (b)

0.002

   

Polychlorinated biphenyls (PCBs)1

 

0.05

       

Portland cement (total dust)

           

(65997-15-1)

 

10(D)

       

Potassium hydroxide

           

(1310-58-3)

         

2

Poultry Dust (total dust)

 

5

       

Precipitated silica (total dust)

           

(1309-37-1)

 

10

       

Propane

           

(74-98-6)

2,500

         

Propargyl alcohol

           

(107-19-7) — Skin

1

2.3

   

((2-Propenyloxy) methyl) oxirane

           

(106-92-3) — Skin

1

         

beta-Propiolactone

           

(57-57-8)

0.5

1.5

   

Propionic acid

           

(79-09-4)

10

30

   

Propoxur

           

(114-26-1)

0.5

   

n-Propyl acetate

           

(109-60-4)

200

830

250

1,040

   

n-Propyl alcohol

           

(71-23-8) — Skin

200

490

250

615

   

1,2-Propylene glycol dinitrate

           

(6423-43-4) — Skin

0.05

0.34

   

1,2-Propylene glycol, total vapour & aerosol

           

(57-55-6)

50

155

       

1,2-Propylene glycol, aerosol only

           

(57-55-6)

 

10(C)

       

Propylene glycol monomethyl ether acetate

           

(108-65-6)

50

270

       

Propylenimine

           

(75-55-8) — Skin

2

4.7

   

n-Propyl nitrate

           

(627-13-4)

25

105

40

170

   

Propyne

           

(74-99-7)

1,000

1,635

1,250

2,045

   

Pyrethrum

           

(8003-34-7)

5

   

Pyridine

           

(110-86-1)

5

16

   

Quinone

           

(106-51-4)

0.1

0.44

   

Resin core solder pyrolysis products (as formaldehyde)

 

0.1

       

Resorcinol

           

(108-46-3)

10

45

20

90

   

Rhodium, metal and water-insoluble compounds of (as rhodium)

           

(7440-16-6), (b)

1

   

Rhodium, water-soluble compounds of, including chloride, nitrate, and sulfate (as rhodium)

           

(7440-16-6), (b)

0.01

   

Ronnel

           

(299-84-3)

10

   

Rotenone (commercial)

           

(83-79-4)

5

   

Rouge (total dust)

           

(1309-37-1)

 

10(D)

       

Rubber solvent1 (a)

 

1,600

       

Selenium and its compounds except selenium hexafluoride and hydrogen selenide (as selenium)

           

(7782-49-2), (b)

0.2

   

Selenium hexafluoride (as selenium)

           

(7783-79-1)

0.025

0.1

   

Shellac dust (total dust)

           

(9000-59-3)

 

10

       

Silane

           

(7803-62-5)

5

6.6

   

Silica fume, respirable

           

(69012-64-2)

 

2

       

Silica fused, respirable

           

(60676-86-0)

 

0.1

       

Silica gel

           

(112926-00-8)

 

10

       

Silicon (total dust)

           

(7440-21-3)

 

10

       

Silicon carbide (total dust)

           

(409-21-2)

 

10(D)

       

Silver, metal

           

(7440-22-4)

0.1

   

Silver, water-soluble compounds of (as silver)

           

(7440-22-4), (b)

0.01

   

Sisal dust (total dust)

 

2

       

Soap dust

           

(68918-36-5)

 

5

       

Soapstone (a), total dust

 

6

       

Soapstone (a), respirable

 

3

       

Sodium azide

           

(26628-22-8)

       

0.1

0.26

Sodium bisulfite

           

(7631-90-5)

5

   

Sodium fluoroacetate

           

(62-74-8) — Skin

0.05

0.15

   

Sodium hydroxide

           

(1310-73-2)

         

2

Sodium metabisulfite

           

(7681-57-4)

5

   

Spectinomycin

 

2

       

Starch (total dust)

           

(9005-25-8)

 

10

       

Stearates (total dust) (a)

 

10

       

Stoddard solvent1

           

(8052-41-3)

 

525

       

140 Degree C Flash Aliphatic Solvent, Type of Stoddard Solvent

 

525

       

Strontium chromate, as Cr

           

(7789-06-2)

 

0.0005

       

Strychnine

           

(57-24-9)

0.15

   

Styrene**

           

(100-42-5)

50

213

200

852

   

Sucrose (total dust)

           

(57-50-1)

 

10

       

Subtilisins(proteolytic enzymes as 100% pure crystalline enzyme)

           

(9014-01-1)

         

0.00006

Sulfometuron methyl

 

5

       

(74222-97-2)

           

Sulfur dioxide

           

(7446-09-5)

2

5.2

5

10.4

   

Sulfur hexafluoride

           

(2551-62-4)

1,000

5,970

   

Sulfur monochloride

           

(10025-67-9)

       

1

6

Sulfur pentalfluoride

           

(5714-22-7)

       

0.01

0.1

Sulfur tetrafluoride

           

(7783-60-0)

       

0.1

0.4

Sulfuric acid

           

(7664-93-9)

 

1

 

3

   

Sulfuryl fluoride

           

(2699-79-8)

5

21

10

42

   

Sulprofos

           

(35400-43-2)

1

   

Synthetic Vitreous Fibers (Man made Mineral Fibers)

           

Continuous filament glass fibers

1f/cc

         

Continuous filament glass fibers, inhalable

 

5

       

Glass wool fibers

1f/cc

         

Rock wool fibers

1f/cc

         

Slag wool fibers

1f/cc

         

Special purpose glass fibers

1f/cc

         

Synthetic vitreous fibers, not otherwise classified (excluding fibrous glass dust and mineral wool fiber)

1f/cc(E)

         

Talc (containing no asbestos fibres), respirable

           

(14807-96-6)

 

2(D)

       

Talc (containing fibres other than those of asbestos and tremolite asbestos)

 

2f/cc(B)

       

Tantalum, metal and oxide (total dust)

           

(7440-25-7), (b)

 

10

       

Tellurium and its compounds except tellurium hexafluoride (as tellurium)

           

(13494-80-9), (b)

0.1

   

Tellurium hexafluoride (as tellurium)

           

(7783-80-4)

0.01

0.1

   

Temephos

           

(3383-96-8)

10

   

Terephthalic acid

           

(100-21-0)

 

10

       

Terphenyls (sum of o-, m-, and p-isomers)

           

(84-15-1), (92-06-8), (92-94-4)

       

0.5

4.7

1,1,2,2-Tetrabromoethane

           

(79-27-6)

1

14

   

1,1,1,2-Tetrachloro-2,2-difluoroethane

           

(76-11-9)

500

4,165

   

1,1,2,2-Tetrachloro-1,2-difluoroethane

           

(76-12-0)

500

4,165

   

1,1,2,2-Tetrachloroethane

           

(79-34-5) — Skin

1

7

   

Tetrachloroethylene

           

(127-18-4)

25

 

100

     

Tetrachloronaphthalene

           

(1335-88-2)

2

   

Tetrachlorophathalic Anhydride

           

(117-08-8)

 

0.1

       

Tetrachlorophenol

           

(25167-83-3) — Skin

 

0.5

       

Tetraethyl dithiono-pyrophosphate

           

(3689-24-5) — Skin

0.2

   

Tetraethyl pyrophosphate

           

(107-49-3) — Skin

0.004

0.047

   

Tetrahydrofuran

           

(109-99-9)

200

590

250

735

   

Tetramethoxysilane

           

(681-84-5)

1

6.2

   

Tetramethylsuccino-dinitrile

           

(3333-52-6) — Skin

0.5

2.8

   

Tetranitromethane

           

(509-14-8)

0.005

         

Tetrasodium pyrophosphate

           

(7722-88-5)

5

   

Thallium, water-soluble compounds of (as thallium)

           

(7440-28-0), (b) — Skin

0.1

   

4,4´-Thiobis(6-tert-butyl-m-cresol)

           

(96-69-5)

10

   

Thioglycolic acid

           

(68-11-1) — Skin

1

3.8

   

Thionyl chloride

           

(7719-09-7)

       

1

5

Tin, metal, oxide and inorganic compounds of, except stannane (as tin)

           

(7440-31-5), (b)

2

   

Tin, organic compounds of (as tin)

           

(7440-31-5) — Skin

0.1

   

Titanium dioxide (total dust)

           

(13463-67-7)

 

10

       

Toluidine (sum of o-, m- and p-isomers:

           

(95-53-4), (108-44-1), and (108-49-0)) — Skin

2

9

   

Toxaphene1

           

(8001-35-2) — Skin

 

0.5

 

1

   

Tributyl phosphate

           

(126-73-8)

0.2

2.2

   

Trichloroacetic acid

           

(76-03-9)

1

6.7

   

1,2,4-Trichlorobenzene

           

(120-82-1)

       

5

37

1,1,1-Trichloro-2,2-bis-(p-chlorophenyl)ethane

           

(50-29-3)

1

   

1,1,1-Trichloroethane

           

(71-55-6)

350

1,910

450

2,455

   

1,1,2-Trichloroethane

           

(79-00-5) — Skin

10

55

   

Trichloroethylene

           

(79-01-6)

50

 

100

     

Trichlorofluoromethane

           

(75-69-4)

       

1,000

5,600

Trichloromethane

           

(67-66-3)

10

49

   

Trichloromethanesulfenyl chloride

           

(594-42-3)

0.1

0.8

   

Trichloronaphthalene

           

(1321-65-9) — Skin

5

   

Trichloronitromethane

           

(76-06-2)

0.1

0.67

0.3

2

   

(2,4,5-Trichlorophenoxy) acetic acid and esters of (as 2,4,5-T)

           

(93-76-5), (b)

10

   

1,2,3-Trichloropropane

           

(96-18-4) — Skin

10

60

   

1,1,2-Trichloro-1,2,2-trifluoroethane

           

(76-13-1)

1,000

7,650

1,250

9,560

   

Tri-ortho-cresyl phosphate

           

(78-30-8) — Skin

0.1

   

Triethanolamine

           

(102-71-6)

0.5

3.1

       

Triethylamine

           

(121-44-8)

1

 

3

     

Triethylenediamine

           

(280-57-9) — Skin

1

4.6

       

Triethylenetetramine

           

(112-24-3) — Skin

0.5

3

       

1,3,5-Triglycidyl-s-triazinetrione

           

(2451-62-9)

 

0.05

       

3,5,5-Trimethyl-2-cyclohexen-1-one

           

(78-59-1)

       

5

28

Trimellitic anhydride

           

(552-30-7)

         

0.04

Trimethoxyvinylsilane

           

(2768-02-7)

   

10

60

   

Trimethylamine

           

(75-50-3)

5

 

15

     

Trimethylbenzene (sum of isomers)

           

(25551-13-7)

25

123

   

Trimethyl phosphite

           

(121-45-9)

2

10

   

2,4,6-Trinitrophenol

           

(88-89-1) — Skin

0.1

0.3

   

Triphenyl amine

           

(603-34-9)

5

   

Triphenyl phosphate

           

(115-86-6)

3

   

Trixylylphosphate

           

(25155-23-1)

 

0.1

       

Tungsten, water-insoluble compounds of (as tungsten)

           

(7440-33-7), (b)

5

10

   

Tungsten, water-soluble compounds of, including tungstic acids, phosphotungstic acids and their salts (as tungsten)

           

(7440-33-7), (b)

1

3

   

Turpentine

           

(8006-64-2)

 

560

       

Uranium (natural) and its compounds (as uranium)

           

(7440-61-1), (b)

0.2

0.6

   

V.M.& P. Naphtha1

           

(8030-30-6)

 

1,350

       

n-Valeraldehyde

           

(110-62-3)

50

175

   

Vanadium respirable dust and fume (as vanadium pentoxide)

           

(1314-62-1), (b)

0.05

   

Vegetable oils (mists) except mists of irritant oils such as oils of castor and cashew nut (a)

 

10

       

Vinyl acetate

           

(108-05-4)

10

 

15

     

Vinyl bromide

           

(593-60-2)

0.5

         

4-Vinyl cyclohexene

           

(100-40-3)

0.1

         

Vinyl fluoride

           

(75-02-5)

1

         

Vinylidene fluoride

           

(75-38-7)

500

         

Vinyltoluene (mixture of m- and p-isomers)

           

(25013-15-4)

50

241

100

482

   

Warfarin

           

(81-81-2)

0.1

   

Welding fume or particulate

           

Aluminum-containing (as aluminum)

           

(7429-90-5), (b)

 

5

       

Iron-containing (as iron)

           

(7439-89-6), (b)

 

5

       

Other, not otherwise classified (total weight, oil free) (a)

 

5

       

Wheat Flour Dust (total dust)

 

3

       

Wood dust

           

— certain hardwoods as beech and oak, (a)

1

   

— softwood, (a)

5

10

   

m-Xylene-alpha, alpha’-diamine

           

(1477-55-0) — Skin

         

0.1

Yttrium, metal and compounds (as yttrium)

           

(7440-65-5), (b)

1

   

Zinc chromates,

           

(13530-65-9;11103-86-9;37300-23-5) as Cr

 

0.01

       

Zinc chloride fume

           

(7646-85-7)

1

2

   

Zinc oxide dust (total dust)

           

(1314-13-2)

 

10

       

Zinc oxide fume

           

(1314-13-2)

5

10

   

Zirconium compounds (as zirconium)

           

(7440-67-7), (b)

5

10

   

* Not licenced for use in Ontario as a pesticide.

** Special exceptions may apply to this substance; see section 9 of the Regulation.

Footnotes

(A) Provided that the total dust contains less than 0.7% vanadium.

(B) Provided that the respirable dust concentration does not exceed 2 mg/m3.

(C) For assessing the visibility in a work environment where 1,2-propylene glycol aerosol is present.

(D) The value is for particulate matter containing no asbestos and less than 1% crystalline silica.

(E) A secondary limit of 5 mg/m3 (total dust) is recommended to deal with dusty operations where fibre counts are usually difficult to determine.

Where both types of measurements are made simultaneously, the more restrictive limit should be used to assess the exposures.

1As sum of components assayed by chromatographic procedure with reference to the bulk sample.

R.R.O. 1990. Reg. 833, Sched., Part 4; O. Reg. 597/94, s. 1; O. Reg. 388/00, ss. 6, 9.

PART 5 Revoked: O. Reg. 388/00, s. 7.

PART 6 Revoked: O. Reg. 388/00, s. 7.

PART 7 Revoked: O. Reg. 388/00, s. 7.

PART 8 Revoked: O. Reg. 388/00, s. 7.

PART 9 EXPOSURE VALUES FOR SIMPLE ASPHYXIANTS

The agents listed below are examples of simple asphyxiants which have not been assigned any definite exposure values. These agents cause asphyxiation by diluting the atmospheric oxygen level below that required to maintain normal respiratory function. If any of the listed gases and vapours is present in the air, the minimal oxygen content should not be less than 18 per cent by volume at any time. A number of the simple asphyxiants can form explosive mixtures in air; therefore, the explosive hazard should be considered when limiting the airborne concentration of these asphyxiants.

Agent

(CAS Reg. No.)

Acetylene

(74-86-2)

Argon

(7440-37-1)

Ethane

(74-84-0)

Ethylene

(74-85-1)

Helium

(7440-59-7)

Hydrogen

(1333-74-0)

Methane

(74-82-8)

Neon

(7440-01-9)

Nitrogen

(7727-37-9)

Propane

(74-98-6)

Propylene

(115-07-1)

R.R.O. 1990, Reg. 833, Sched., Part 9.

PART 10 KNOWN TOXIC AGENTS FOR WHICH EXPOSURE VALUES HAVE NOT BEEN ESTABLISHED, AND TO WHICH ANY EXPOSURE SHOULD BE AVOIDED

Agent

(CAS Reg. No.)

Benzidine — Skin

(92-87-5)

Benzo(a)pyrene

(50-32-8)

(1,1´-Biphenyl)-4-amine — Skin

(92-67-1)

Chloromethyl methyl ether

(107-30-2)

Chrysene

(218-01-9)

1,2-Dibromoethane — Skin

(106-93-4)

3,3´Dichlorobenzidine — Skin

(91-94-1)

3,3´-Dimethyl-(1,1´-biphenyl)-4,4´­diamine — Skin

(119-93-7)

Dimethylcarbamoyl chloride

(79-44-7)

Hexamethylphosphoric triamide — Skin

(680-31-9)

beta-Naphthylamine

(91-59-8)

4-Nitrobiphenyl

(92-93-3)

N-Nitrosamines — Skin (e.g. N­Nitrosodimethylamine)

(a)

1,2-Oxathiolane 2,2-dioxide

(1120-71-4)

N-Phenyl-beta-naphthylamine

(135-88-6)

R.R.O. 1990, Reg. 833, Sched., Part 10.

PART 11 EXPOSURE VALUES* FOR ACRYLONITRILE, BENZENE AND MERCURY

Agent

TWAEV

STEV

CEV

(CAS Reg. No.)

ppm

mg/m3

ppm

mg/m3

ppm

mg/m3

Acrylonitrile

           

(107-13-1)

2

4.3

10

21.5

Benzene

           

(71-43-2)

1

 

5.0

     

Mercury

           

All forms of except alkyl (as mercury)

           

(7439-97-6), (b) — Skin

 

0.025

       

Alkyl compounds of (as mercury)

           

(7439-97-6), (b) — Skin

 

0.01

 

0.03

   

* The values listed in this part apply to work places to which the designated substance regulation does not apply.

R.R.O. 1990, Reg. 833, Sched., Part 11; O. Reg. 388/00, s. 8.

R.R.O. 1990, Reg. 833, Sched.; O. Reg. 597/94, ss. 1, 2; O. Reg. 388/00, ss. 1-9.