Substance

TWA OEL-RL ppm

TWA OEL-RL mg/m³

Short Term OEL-RL ppm

Short Term OEL-RL mg/m³

1995 Notes

Acrylamide

CH2=CHCONH2

-

0.3

-

-

Sk

Acrylonitrile

CH2=CHCN

2

4

Sk

Arsenic and compounds

As

-

0.1

-

-

except Arsine (as As)

Asbestos - all forms

See Asbestos Regulations

Benzene

C6H6

5

16

Bis-(chloromethyl) ether (BCME)

ClCH2OCH2Cl

0.001

0.005

New

Buta-1,3-diene

CH2=CHCH=CH2

10

22

2-Butoxyethanol (EGBE)

C4H9OCH2CH2OH

25

120

Sk

Cadmium compounds except CdO fumes and CdS

Cd

-

0.05

-

-

Cadmium Oxide fumes

CdO

0.05

0.05

Cadmium Sulphide pigments (respirable dust Cd)

CdS

0.04

Carbon Disulphide

CS2

10

30

Sk

Chromium IV compounds

0.05

1,2 Dibromoethane (ethylene dibromide)

BrCH2CH2Br

0.5

4

Sk

Dichloromethane

CH2Cl2

100

350

2,2'Dichloro-4,4'methylene dianiline (MbOCA)

CH3(C6H3ClNH2)2

0.005

Sk

2-Ethoxyethanol

C2H5OCH2CH2OH

10

37

Sk

2-Ethoxyethyl acetate

C2H5OCH2CH2OOCCH3

10

54

Sk

Ethylene oxide

5

10

Formaldehyde

2

2.5

2

2.5

Grain dust

See Annexure 7

10

Sen

Hydrogen cyanide

10

10

Sk

Isocyanate (all isomers) as NCO

0.02

0.07

Sen

Lead and compounds- as Pb

See the Lead Regulations

2-Methoxyethanol

CH3OCH2CH2OH

5

16

Sk

2-Methoxyethyl acetate

CH3COOCH2CH2OCH3

5

24

Sk

Nickel

Ni

0.05

Nickel compounds

as Ni

0.1 0.5

soluble insoluble

Rubber process dust

8

See Annexure 6

Rubber fume

0.6

Silica crystalline

SiO2

0.1

respirable dust

Styrene

C6H5CHCH2

100

420

250

1050

1,1,1-Trichloroethane

CH3CCl3

350

1900

450

2450

Trichloroethylene

CCl2=CHCl

100

535

150

802

Skin

Vinyl chloride

CH2=CHCl

7

annual TWA OEL-CL of 3 ppm

Vinylidene chloride

CH2=CCl2

10

40

Wood dust (hard wood)

5

Sen