LIST OF APPROVED OCCUPATIONAL EXPOSURE STANDARDS ...

Long-term exposure Short-term exposure 

limit (8 hour TWA limit (15 minute 

reference period) reference period) 

LIST OF APPROVED OCCUPATIONAL EXPOSURE STANDARDS (correct at 23/07/04) 

Substance CAS ppm mg.m-³ ppm mg.m-³ Notes MDHS OEL summary & Health R phrases (in 

Number 

other guidance 

ASL) 

Acetaldehyde 75-07-0 20 37 50 92 70 EH64/D95 R36/37, 40 

Acetic Acid 64-19-7 10 25 15 37 ILV 96 R35 

Acetic anhydride 108-24-7 0.5 2.5 2 10 EH64/D1 R10, 20/22, 34 

Acetone 67-64-1 500 1210 1500 3620 New, IOELV 88,96 CD156 & CD166 R36, 66, 67 

Acetonitrile 75-05-8 40 68 60 102 ILV 72,80,88,96 R23/24/25 

Acetylene 74-86-2 Asphyxiant 

o-Acetylsalicylic acid 50-78-2 5 

Acrylaldehyde 107-02-8 0.1 0.23 0.3 0.70 70 R25, 26 34 

Acrylic acid 79-10-7 10 30 20 60 R21/22, 35, 50 

Aldrin (ISO) 309-00-2 0.25 0.75 Sk R24/25, 40, 48/24/25 

Allyl alcohol 107-18-6 2 4.8 4 9.7 IOELV, Sk 88,96 R23/24/25, 36/37/38 

Allyl-2,3-epoxypropyl ether 106-92-3 OES withdrawn R 20, 43 

Aluminium alkyl componds 2 R34 

*Alumini um metal 7429-90-5 14/3 EH64/D3 

total inhalable dust 10 

respirable dust 4 

*Aluminium oxides 1344-28-1 14/3 EH64/D4 



Aluminium salts, soluble 2 

2-Aminoethanol 141-43-5 3 7.6 6 15 96 R20, 36/37/38 

Ammonia, anhydrous 7664-41-7 25 18 35 25 IOELV CD156 R23, 34 

Ammonium chloride, fume 12125-02-9 10 20 14/3 R22, 36 

Ammonium, sulphamidate 7773-06-0 10 20 

Anisidines o & p 90-04-0 0.1 0.51 CHAN 96 Ortho isomer – R45, 

26/27/28, 33 

†p-Aramid respirable fibres 26125-61-1 87, 14/3 EH64/D72, EH65/17 

Argon 7440-37-1 Asphyxiant 

*Note: The OES for aluminium does not include exposure to aluminium coated with mineral oil, or to fume arising from aluminium welding 

processes. The OES for welding fume applies to this type of exposure. 

†Note p-Aramid respirable fibres are subject to an occupational exposure standard of 0.5 fibres/ml, 8-hour TWA. 

- 1 -




Substance CAS ppm mg.m-³ ppm mg.m-³ Notes MDHS OEL summary & Health R phrases (in 

Number 

other guidance ASL) 

Arsine 7784-42-1 0.05 16 EH73 R26, 48/20 

Asphalt, petroleum fumes 8052-42-4 5 10 

Azinphos-methyl (ISO) 86-50-0 0.2 0.6 Sk MS17 (including 

biological monitoring) 

R24, 26/28, 43 

Barium compounds, 

soluble (as BA) 

7440-39-3 0.5 ILV 91 

Barium sulphate, 7727-43-7 14/3 EH64/96, EH72/9 



Benomyl (ISO) 17804-35-2 10 15 R40 

Benzenethiol 108-98-5 0.5 2.3 

p-Benzoquinone 106-51-4 0.1 0.45 0.3 1.3 R23/25,36/37/38 

Benzyl butyl phthalate 85-68-7 5 32,96 

Biphenyl 92-52-4 0.2 1.3 0.6 3.8 R36/37/38 

Bis(2,3-epoxypropyl) ether 2238-07-5 OES 

withdrawn 

Bis(2-ethylhexyl) phthalate 117-81-7 5 10 32,96 

Bornan-2-one 76-22-2 2 13 3 19 88, 96 

Boron tribromide 10294-33-4 1 10 70 EH64/D7 R26/28, 35 

Boron trifluoride 7637-07-2 1 2.8 70 EH64/D8 R26, 35 

Bromacil (ISO) 314-40-9 1 11 2 22 

Bromine 7726-95-6 0.1 0.66 0.3 2.0 ILV R26, 35 

Bromine pentafluoride 7789-30-2 0.1 0.73 0.3 2.2 

Bromochloromethane 74-97-5 200 1080 250 1340 CHAN 88,96 CD150 

Bromoethane 74-96-4 200 906 250 1130 CHAN 72,80,88,96 R20/22, 40 

Bromoform 75-25-2 0.5 5.3 Sk 88,96 R23, 36/38 

Bromomethane 74-83-9 5 20 15 59 Sk EH72/3 R23/25,36/37/38,40,48/20 

Bromotrifluoromethane 75-63-8 1000 6190 1200 7430 96 

Butane 106-97-8 600 1450 750 1810 60 

Butan-1-ol 71-36-3 50 154 Sk 72,80,88,96 R22, 37/38, 41, 67 

Butan-2-ol 78-92-2 100 308 150 462 88, 96 R36/37, 67 

- 2 -




Substance CAS ppm mg.m-³ ppm mg.m-³ Notes MDHS OEL summary & Health R phrases 

Number 

other guidance (in ASL) 

Butan-2-one (methyl ethyl 

ketone) 

78-93-3 200 600 300 899 IOELV,Sk,Bmgv 72,88 CD156 R36. 66, 67 

2-Butoxyethanol (butyl 

cellosolve) 

111-76-2 25 50 New,Sk,Bmgv,IOELV 72,80 CD156 R20/21/22, 37 

2-Butoxyethyl acetate 112-07-02 20 50 New, IOELV, Sk CD156 R20/21/22, 37 

Butyl acetate 123-86-4 150 724 200 966 72,80,88,96 R66, 67 

sec-Butyl acetate 105-46-4 200 966 250 1210 88,96 R66 

tert-Butyl acetate 540-88-5 200 966 250 1210 72,88 R66 

n-Butyl acrylate 141-32-2 1 5 5 26 New, IOELV 80,88 CD157 R36/37/38, 43 

n-Butylamine 109-73-9 5 15 Sk 70 EH64/D10 R20/21/22, 35 

n-Butyl chloroformate 592-34-7 1 5.7 R23, 34 

n-Butyl glycidyl ether (BGE) 2426-08-6 OES withdrawn 88, 96 R20, 43 

Butyl lactate 138-22-7 5 30 

2-sec-Butylphenol 89-72-5 5 31 Sk 

Caesium hydroxide 21351-79-1 2 91 

Calcium carbonate 1317-65-3 14/3 



Calcium cyanamide 156-62-7 0.5 1 R22, 37, 41 

Calcium hydroxide 1305-62-0 5 ILV 

Calcium oxide 1305-78-8 2 

Calcium silicate 1344-95-2 

total inhalable dust 10 14/3 


Captafol (ISO) 2425-06-1 0.1 R45, 43 

Captan (ISO) 133-06-2 5 15 94 R36, 40, 43 

Carbofuran (ISO) 1563-66-2 0.1 R26/28 

Carbon black 1333-86-4 3.5 7 14/3 EH21 

Carbon dioxide 124-38-9 5000 9150 15000 27400 ILV 

Extended periods of exposure to carbon monoxide around the STEL, particularly without interruption, raise concerns for adverse health effects hould be avoided. 

- 3 -




Substance CAS ppm mg.m-³ ppm mg.m- Notes MDHS OEL summary & Health R phrases 

Number 

³ 


Carbon monoxide* 630-08-0 30 35 200 232 Bmgv EH43, EH64/D101 R23, 48/23, 61 

Carbon tetrabromide 558-13-4 0.1 1.4 0.3 4.1 88 

Carbon tetrachloride 56-23-5 2 13 Sk 72,80,88,96 EH64/D11, EH65/10 R23/24/25, 40, 48/23 

Cellulose (pure) 9004-34-6 

total inhalable dust 10 20 14/3 


Chlorine 7782-50-5 0.5 1.5 1 2.9 70 EH64/D12 R23,36/37/38 

Chlorine dioxide 10049-04-4 0.1 0.28 0.3 0.84 EH64/D105 R6,8,50 

Chlorine trifluoride 7790-91-2 0.1 0.38 70 EH64/D13 

Chloroacetaldehyde 107-20-0 1 3.3 70 EH64/D14 R24/25,26,34,40 

2-Chloroacetophenone 532-27-4 0.05 0.32 

2-Chlorobuta-1,3-diene 126-99-8 10 37 Sk 88,96 R20/22, 36 

Chlorodifluoromethane 75-45-6 1000 3590 IOELV 96 EH64/D16, EH65/7 

Chloroethane 75-00-3 1000 2700 1250 3380 CHAN, IOELV 96 CD157 R12, 40,52,53 

2-Chloroethanol 107-07-3 1 3.4 Sk 88,96 EH64/D17 R26/27/28 

Chloroform 67-66-3 2 9.9 Sk, IOELV 80,88,96 EH64/D18,CD156 R22,38,40,48/20/22 

Chloromethane 74-87-3 50 105 100 210 R40, 48/20 

1-Chloro-4-nitrobenzene 100-00-5 1 2 Sk R23/24/25, 33 

Chloropentafluoroethane 76-15-3 1000 6420 

3-Chloropropene 107-05-01 CHAN EH72/4 R11,R26,R50 

Chlorosulphonic acid 7790-94-5 1 70 EH64/D19 R35,37 

2-Chloroto luene 95-49-8 50 264 88 R20 

2-Chloro-6- 

(trichloromethyl) pyridine 

1929-82-4 10 20 R22 

Chlorpyrifos (ISO) 2921-88-2 0.2 0.6 Sk 94 MS17 (including 

R24/25 


Chromium 7440-47-3 0.5 12/2, 91 EH2,EH6,MS24,TR21 

Chromium (II) 

compounds (as Cr) 0.5 12/2,91 EH2, MS24, TR21 

Chromium (III) 

compounds (as Cr) 0.5 12/2,91 EH2, MS24, TR21 

Coal dust 

respirable dust 2 14/3 

- 4 -





Copper 

Number 

³ 


fume 7440-50-8 0.2 91 EH64/D20 

dusts and mists (asCu) 7440-50-8 1 2 91 EH44,EH64/C44 

Cresols, all isomers 1319-77-3 5 22 Sk, ILK 96 R24/25, 34 

Cryofluorane (INN) 76-14-2 1000 7110 1250 8890 96 

Cumene 98-82-8 25 125 50 250 New,IOELV, SK 72,80,88,96 EH64/D21, CD166 R37 

Cyanamide 420-04-2 2 R21,25,36/38,43 

Cyanides 

except hydrogen cyanide, 

cyanogen & cyanogen 

chloride, (as CN) 

57-12-5 5 Sk 

Cyanogen chloride 506-77-4 0.3 0.77 EH64/D22 

Cyclohexane 110-82-7 100 350 300 1050 60,88,96 EH64/D23 R38,65,67 

Cyclohexanol 108-93-0 50 208 88,96 R20/22,37/38 

Cyclohexanone 108-94-1 10 20 New, IOELV, Sk 72,88,96 CD157 & CD166 R20 

Cyclohexene 110-83-8 300 1020 72,80,88,96 

Cyclohexylamine 108-91-8 10 41 R21/22,34 

Cyhexatin (ISO) 13121-70-5 5 10 R20/21/22 

2,4-D (ISO) 94-75-7 10 20 R22, 36/37/38 

Dialkyl 79 phthalate 83968-18-7 5 

Diallyl phthalate 131-17-9 5 R22 

1,2-diaminoethane 

Diammonium 

107-15-3 10 25 CHAN EH72/7 R21/22,34,42/43 

peroxodisulphate([S208]) 

7727-54-0 1 R22,36/37/38,42/43 

Diatomaceous earth, 61790-53-2 

natural, respirable dust 1.2 14/3 

Diazinon (ISO) 333-41-5 0.1 0.3 Sk MS17 (including 


R22 

Dibenzoyl peroxide 94-36-0 5 R36,43 

Dibismuth tritelluride 1304-82-1 10 20 91 

- 5 -





Number 

³ 


Dibismuth tritelluride, 91 

selenium doped 5 10 

Diborane 19287-45-7 0.1 0.12 

Diboron trioxide 1303-86-2 10 20 

Dibromodifluoromethane 75-61-6 100 872 150 1310 96 

Dibutyl hydrogen phosphate 107-66-4 1 8.7 2 17 

Dibutyl phthalate 84-74-2 5 10 32 TR14 

Dichloroacetylene 7572-29-4 0.1 0.39 EH64/D24 R40,48/20 

1,2-Dichlorobenzene 

95-50-1 25 153 50 360 New,IOELV, Sk 88,96 CD156 R22,36/37/38 

(orthodichlorobenzene) 

1,4-Dichlorobenzene 

(para-dichlorobenzene) 

106-46-7 25 153 50 306 IOELV 88,96 CD156 R22,36/38 

Dichlorodifluoromethane 

1,3-Dichloro-5, 

75-71-8 1000 5030 1250 6280 96 

5-dimethyl-hydantoin 118-52-5 0.2 0.4 

1,1-Dichloroethane 

1,2-Dichloroethylene 

75-34-3 100 New, IOELV, Sk 88,96 CD156, EH65/4 R22,36/37 

cis:trans isomers 60:40 540-59-0 200 806 250 1010 88,96 R20 

Dichlorofluoromethane 75-43-4 10 43 96 

Dichlorvos (ISO) 62-73-7 Sk, OES 

R24/25 

Dicyclohexyl phthalate 84-61-7 5 32 TR14 

Dicyclopentadiene 77-73-6 5 27 R20/22,36/37/38 

Dieldrin (ISO) 60-57-1 0.25 0.75 Sk R25,27,40,48/25 

Diethylamine 109-89-7 10 30 25 76 ILV 96 R20/21/22,35 

2-Diethylaminoethanol 100-37-8 10 49 Sk 96 R20/21/22,34 

Diethyl ether 60-29-7 100 310 200 620 New, IOELV 88,96 CD157 & CD166 R22,66,67 

Diethyl phthalate 84-66-2 5 10 32 

Diisobutyl phthalate 84-69-5 5 32 TR14 

Diisodecyl phthalate 26761-40-0 5 32 TR14 

Diisononyl phthalate 28553-12-0 5 32 TR14 

Diisooctyl phthalate 27554-26-3 32 TR14 

Diisopropylamine 108-18-9 5 21 R20/22,34 

withdrawn 

- 6 -





Number 


Diisopropyl ether 108-20-3 250 1060 310 1310 88,96 R66/67 

Dimethoxymethane 109-87-5 1000 3160 1250 3950 88,96 

NN-Dimethylacetamide 127-19-5 10 36 20 72 Sk,Bmgv,IOELV 88,96 EH64/D68,EH65/3 R20/21,36 

Dimethylamine 124-40-3 2 3.8 6 11 IOELV EH64/D106 R12,20,37/38,41 

Dimethylaminoethanol 108-01-0 2 7.4 6 22 EH64/D91,EH72/2 R20/21/22,34 

NN-Dimethylaniline 121-69-7 5 25 10 50 Sk 88,96 R23/24/25,40 

1,3-Dimethylbutyl acetate 108-84-9 50 299 100 599 88 

Dimethyl ether 115-10-6 400 766 500 958 IOELV CD156 

NN-Dimethylethylamine 598-56-1 10 30 15 46 70 EH64/D28 R20/22,34 

Dimethylformamide 68-12-2 10 30 20 61 Sk 88 R61,20/21,36 

2,6-Dimethylheptan-4-one 108-83-8 25 148 88,96 R37 

Dimethyl phthalate 131-11-3 5 10 

Dinitrobenzene, all isomers 25154-54-5 0.15 1.0 0.5 3.5 Sk 

Dinonyl phthalate 84-76-4 5 32 TR14 

1,4-Dioxane, (tech. grade) 123-91-1 25 91 100 366 Sk 80,88,96 R36/37, 40 

Dioxathion (ISO) 78-34-2 0.2 Sk MS17 (including R24,26/28 


Diphenylamine 122-39-4 10 20 R23/24/25,33 

Diphenyl ether (vapour) 101-84-8 1 7.1 88,96 

Diphosphorus pentasulphide 1314-80-3 1 3 ILV TR30 R20/22 

Diphosphorus pentoxide 1314-56-3 2 ILV EH64/D75,TR30 R35 

Dipotassium 

peroxodisulphate ([S208]) 7727-21-1 1 79 R22,36/37/38,42/43 

Diquat dibromide (ISO) 85-00-7 0.5 1 R22,26,36/37/38,43, 

48/25 

Disodium disulphate 7681-57-4 5 

Disodium peroxodisulphate 7775-27-1 1 79 

([S208]) 

Disodium tetraborate, 

anhydrous 1330-43-4 1 

decahydrate 1303-96-4 5 

pentahydrate 11130-12-4 1 

- 7 -





Number 

³ 


Disulfoton (ISO) 298-04-4 0.1 0.3 R27/28 

Disulphur decafluoride 5714-22-7 0.025 0.26 0.075 0.79 

Disulphur dichloride 

2,6-Ditertiary-butyl- 

10025-67-9 1 5.6 70 EH64/D29 R20,25,29,35 

Para-cresoL 

6,6-Di-tert-butyl-4, 

128-37-0 10 

4-thiodi-m-cresol 96-69-5 10 20 

Diuron (ISO) 330-54-1 10 R22,40,48/22 

Divinylbenzene 1321-74-0 CHAN 32 88 

Emery 1302-74-5 14/3 

Total inhalable dust 10 


Endosulphan (ISO) 115-29-7 0.1 0.3 Sk 94 R24/25,36 

Endrin (ISO) 72-20-8 0.1 0.3 Sk R24,28 

Enflurane 13838-16-9 50 

383 80,88 EH64/D30 

2,3 Epoxypropyl 

isopropyl ether 4016-14-2 OES withdrawn 80,96 

Ethane 74-84-0 Asphyxiant 

Ethane-1,2-diol, 107-21-1 R22 

particulate 10 IOELV,Sk 14/3 CD156 

vapour 52 104 New,IOELV,Sk 88 CD156 

Ethanethiol 75-08-1 0.5 1.3 2 5.2 88 R20 

Ethanol 64-17-5 1000 1920 70,72,80,8 

8,96 

Ethyl acetate 141-78-6 200 400 Rev 80,88,96 EH64/D113 R36,66,67 

Ethyl acrylate 140-88-5 5 21 15 62 72,88,96 R20/21/22,36/37/38,43 

Ethylamine 75-04-7 2 3.8 6 11 IOELV EH64/D107 R12,36/37 

Ethylbenzene 100-41-4 100 441 125 552 New,IOELV, Sk 72,80,88,9 CD156 & CD166 R20 

Ethyl chloroformate 541-41-3 1 4.5 R22,26,34 

Ethyl cyanoacrylate 7085-85-0 0.3 1.5 90 EH64/D108 R12,36/37/38 

6 

- 8 -





Number 

³ 


Ethylene 74-85-1 Asphyxiant 

Ethylene dinitrate 628-96-6 CHAN 31, Sk 96 R26/27/28,33 

Ethyl formate 109-94-4 100 308 150 462 96 R20/22,36/37 

2-Ethylhexyl chloroformate 24468-13-1 1 8 

4-Ethylmorpholine 100-74-3 5 24 20 96 Sk 

Fenchlorphos (ISO) 299-84-3 10 R21/22 

Ferbam (ISO) 14484-64-1 10 20 R36/37/38,42 

Ferrocene 102-54-5 10 20 

Fluoride (inorganic, as F) 16984-48-8 2.5 IOELV 35/2 CD156 

Fluorine 7782-41-4 1 1 New, IOELV 70 CD156 R26,35 

Formamide 75-12-7 20 37 30 56 

Formic acid 64-18-6 5 9.6 ILV R35 

Furfuryl alcohol 98-00-0 CHAN 33, Sk 86,96 R20/21/22 

Germane 7782-65-2 0.2 0.64 0.6 1.9 

Glycerol, mist 56-81-5 10 

Glycerol trinitrate 55-63-0 CHAN 30, Sk 96 R26/27/28,33 

Graphite 7440-44-0 14/3 



Gypsum 10101-41-4 14/3 



Hafnium 7440-58-6 0.5 1.5 91 

Halothane` 151-67-7 10 82 80,88 EH64/D33 

Helium 7440-59-7 Asphyxiant 

Heptan-2-one 110-43-0 50 237 100 475 Sk, IOELV 88,96 EH64/D76 R20/22 

Heptan-3-one 106-35-4 35 166 100 475 New,IOELV,Sk 88,96 CD156 & CD166 R20,36 

n-Heptane 142-82-05 500 New,IOELV CD156 

- 9 -




Substance CAS ppm mg.m-³ ppm mg.m-³ Notes MDHS OEL summary & 

Number 


Hexachloroethane 67-72-1 

vapour 5 49 88,96 


respirable dust 4 14/3 

Hexahydro-1,3,5-trinitro- 

1,3,5-triazine 

121-82-4 1.5 3 Sk 

Health R phrases 

(in ASL) 

n-Hexane 110-54-3 20 72 72,80,88,96 EH64/D34 R38,48/20 

1,6-Hexanolactam 

(e-Caprolactam) 

105-60-2 R20/22,36/37/38 

dust only 1 3 IOELV 14/3 CD156 

dust and vapour 10 20 New, IOELV CD156 

Hexan-2-one 591-78-6 5 21 Sk 88,96 R48/23,62,67 

Hydrazoic acid (as vapour) 7782-79-8 0.1 0.18 70 EH64/D6 

Hydrogen 133-74-0 Asphyxiant 

Hydrogen bromide 10035-10-6 3 10 IOELV 70 EH64/D35 R35,37 

Hydrogen chloride 

(gas and aerosol mists) 

7647-01-0 1 2 5 8 ILV 70 EH64/D36 R23,35 

Hydrogen fluoride (as F) 7664-39-3 1.8 1.5 3 2.5 New, IOELV 35/2 CD156 R26/27/28,35 

Hydrogen peroxide 7722-84-1 1 1.4 2 2.8 R34 

Hydrogen sulphide 7783-06-4 5 7 10 14 New CD157 R26 

Hydroquinone 123-31-9 2 4 CHAN, ILV CD157 R22,40,41,43,50 

4-Hydroxy-4-methylpentan-2-one 

123-42-2 50 241 75 362 88,96 R36 

2-Hydroxypropyl acrylate 999-61-1 0.5 2.7 Sk R23/24/25,34,43 

2,2’-Iminodiethanol 111-42-2 3 13 R22,38,41,48/22 

2,2’ Iminodi (ethylamine) 111-40-0 1 4.3 Sk R21/22,34,43 

Indene 95-13-6 10 48 15 72 

Indium & compounds (as In) 7440-74-6 0.1 0.3 91 

Iodine 7553-56-2 0.1 1.1 70 EH64/D38 R20/21 

Iodoform 75-47-8 0.6 9.8 1 16 

Iron oxide, fume (as Fe) 1309-37-1 5 10 91 

Iron salts (as Fe) 1 2 91 

- 10 -





Number 


Isobutyl acetate 110-19-0 150 724 187 903 72,88,96 R66 

Isoflurane 

Isooctyl alcohol 

26675-46-7 50 383 80,88 EH64/39 

(mixed isomers) 26952-21-6 50 271 88 

Isopropyl acetate 108-21-4 200 849 72,96 R36,66,67 

Isopropyl chloroformate 108-23-6 1 5.1 

Kaolin 1332-58-7 

respirable dust 2 14/3 EH64/D77, EH65/13 

Ketene 463-51-4 0.5 0.87 1.5 2.6 

Limestone 1317-65-3 14/3 



Lindane (γ-BHC (ISO)) 58-89-9 0.1 Sk, Bmgv 94 EH64/D78 R23/24/25,36/38 

Liquefied petroleum gas (LPG) 68476-85-7 1000 1750 1250 2180 

Lithium hydride 7580-67-8 0.025 14/3 plus 

titrimetry 

EH64/D41 

Lithium hydroxide 1310-65-2 1 ILV 

Magnesite 546-93-0 14/3 



Magnesium oxide (as Mg) 1309-48-4 14/3 EH64/D42 


fume and respirable dust 4 10 

Malathion (ISO) 121/75/5 10 Sk MS17 (including 


Manganese, fume (as Mn) 7439-96-5 1 3 CHAN 91 CD157 

Manganese and compounds 7439-96-5 5 CHAN 91 EH64/D43, CD157 

(as Mn) 

Marble 1317-65-3 14/3 



R22 

- 11 -





Number 


Mequinol (INN) 150-76-5 5 R22,36,43 

Mercaptoacetic acid 68-11-1 1 3.8 

Mercury alkyls (as Hg) 0.01 0.03 Sk R26,27/28,33 

Mercury & its inorganic 16(vapour) EH17,EH64/D79, 

EH65/19,MS12 

divalent compounds 7439-97-6 0.025 Bmgv 

Methacrylic acid 79-41-4 20 72 40 143 R34 

Methacrylonitrile 126-98-7 1 2.8 Sk R23/24/25,43 

Methane 74-82-8 Asphyxiant 

Methanethiol 74-93-1 0.5 1.0 70 R20 

Methanol 67-56-1 200 266 250 333 Sk, ILV 72,80,96 R23/24/25,39/23/24/25 

Methomyl (ISO) 16752-77-5 2.5 R28 

Methoxychlor (ISO) 

(2-Methoxymethylethoxy) 

72-43-5 10 

propanol 34590-94-8 50 308 IOELV, Sk 72 EH64/D109 R36 

1-Methoxypropan-2-ol 107-98-2 100 375 150 560 New,IOELV,Sk CD156 

1-Methoxypropylacetate 108-65-6 50 274 100 548 New,IOELV,Sk 72 CD166 R10,36 

Methyl acetate 79-20-9 200 616 250 770 72,80,88,96 

Methyl acrylate 96-33-3 10 36 88,96 EH64/D45 R20/21/22,36/37/38 

Methylamine 74-89-5 10 13 R20,37/38,41 

N-Methylaniline 100-61-8 0.5 2.2 Sk R23/24/25,33 

3-Methylbutan-1-ol 123-51-3 100 366 125 458 88,96 

Methyl-tert-butyl ether 1634-04-4 25 92 75 275 88,96 

Methyl cyanoacrylate 137-05-3 0.3 1.4 ILV 90 EH64/D108 R36/37/38 

Methylcyclohexanol 25639-42-3 50 237 75 356 88,96 

2-Methylcyclohexanone 583-60-8 50 233 75 350 96 R20 

2-Methyl-4,6-dinitrophenol 

Methyl ethyl ketone 

534-52-1 0.2 0.6 Sk R26/27/28,38,40,41,43, 

44 

peroxides (MEKP) 1338-23-4 0.2 1.5 EH64/D47 

Methyl formate 107-31-3 100 250 150 374 88 R20/22,36/37 

5-Methylheptan-3-one 541-85-5 10 20 New,IOELV 88 CD156 R36/37 

5-Methylhexan-2-one 110-12-3 20 95 100 475 New,IOELVSk 72,88 CD156 & CD166 R20 

Methyl methacrylate 80-62-6 50 208 100 416 72,80,88,96 EH64/D80, EH65/16 R36/37/38,43 

- 12 -





Number 

³ 


2-Methylpentane-2,4-diol 107-41-5 25 123 25 123 R36/38 

4-Methylpentan-2-ol 108-11-2 25 106 40 170 Sk 88,96 R37 

4-Methylpentan-2-one 108-10-1 50 208 100 416 IOELV,SkBmgv 80,88,96 CD156 & CD166 R20,36/37,66 

4-Methylpent-3-en-2-one 141-79-7 15 61 25 102 88 R20/21/22 

2-Methylpropan-1-ol 78-83-1 50 154 75 231 72/88,96 R37/38,41,67 

2-Methylpropan-2-ol 75-65-0 100 308 150 462 72,88,96 R20 

1-Methyl-2-pyrrolidone 

Methylstyrenes, 

872-50-4 25 103 75 309 Sk, 72,80,88,96 EH64/D103,EH72/10 R36/38 

all isomers except 

α-methylstyrene 

N-Methyl-N-2,4 

25013-15-4 100 491 150 736 72,96 

6-tetranitroaniline 479-45-8 1.5 3 R23/24/25,33 

Mevinphos (ISO) 7786-34-7 0.01 0.09 0.03 0.28 Sk MS17 (including R27/28 


Mica 12001-26-2 14/3 


respirable dust 0.08 

Molybdenum compounds 91 

(as Mo), 

soluble compounds 5 10 

insoluble compounds 10 20 

Monochloroacetic acid 79-11-8 0.3 1.2 Sk 70 EH64/D48 R25,34 

Morpholine 110-91-8 20 72 30 109 Sk 88 R20/21/22,34 

Naled (ISO) 300-76-5 3 6 MS17 (including 


R21/22,36/38 

Naphthalene 91-20-3 10 53 15 80 CHAN 72,80,88,96 EH64/D104 

Neon 

Nickel, organic compounds 

7440-01-9 Asphyxiant 

(as Ni) 1 3 

Nicotine 54-11-5 0.5 1.5 Sk, ILV 96 R25,27 

Nitric acid 7697-37-2 2 5.2 4 10 R35 

4-Nitroaniline 100-01-6 6 Sk 70 EH64/D49 R23/24/25,33 

Nitrobenzene 98-95-3 1 5.1 2 10 Sk, ILV 72,96 R23/24/25,40, 

48/23/24,62 

Nitroethane 79-24-3 100 312 R20/22 

- 13 -





Number 


Nitrogen 17778-88-0 Asphyxiant 

Nitrogen dioxide 10102-44-0 CHAN 29 OES withdrawn R26,34 

Nitrogen monoxide 10102-43-9 CHAN 28, ILV OES withdrawn 

Nitrogen trifluoride 7783-54-2 10 30 15 44 

Nitromethane 75-52-5 100 254 150 381 R22 

1-Nitropropane 108-03-2 25 93 R20/21/22 

Nitrotoluene, all isomers 5 29 10 57 Sk 96 

Nitrous oxide 10024-97-2 100 183 80 EH64/D50 

Octachloronaphthalene 2234-13-1 0.1 0.3 Sk 

Oil mist, mineral 5 10 84 EH58,EH49,EH62 

Orthophosphoric acid 7664-38-2 1 2 New, IOELV CD166,TR30 R34 

Osmium tetraoxide (as Os) 20816-12-0 0.0002 0.002 0.0006 0.006 R26/27/28,34 

Oxalic acid 144-62-7 1 2 ILV R21/22 

Oxalonitrile 460-19-5 10 22 R23 

2,2’-Oxydiethanol 111-46-6 23 101 70 EH64/D51 

Ozone 10028-15-6 0.2 0.40 EH38,EH64/D83 

Paracetamol 103-90-2 14/3 EH64/D84,EH65/14 


Paraffin wax, fume 8002-74-2 2 6 

Paraquat dichloride (ISO) 1910-42-5 

respirable dust 0.08 14/3 

Parathion (ISO) 56-38-2 0.1 0.3 Sk MS17 (including 

biological monitoting) 

Parathion-methyl (ISO) 298-00-0 0.2 0.6 Sk MS17 (including 


Pentacarbonyliron (as Fe) 13463-40-6 0.01 0.08 

Pentachlorophenol 87-86-5 0.5 1.5 Sk TR5 R24/25,26, 

36/37/38,40 

Pentaerythritol 115-77-5 14/3 

total inhalable dust 10 20 


Pentan-2-one 107-87-9 200 716 250 895 88,96 

Pentan-3-one 96-22-0 200 716 250 895 88 R37,66,67 

Pentyl acetates (all isomers) 50 270 100 541 IOELV EH64/D111 R10,66 

R27/28 

R24,28 

- 14 -





Number 


Perchloryl fluoride 7616-94-6 3 13 6 26 

p-Phenylenediamine 106-50-3 0.1 R23/24/25,36,43 

Phenyl-2,3-epoxypropyl ether 122-60-1 OES withdrawn 96 R21,43 

Phenylhydrazine 100-63-0 CHAN EH72/1 R23/24/25,36,50 

2-Phenylpropene 98-83-9 50 246 100 491 New, IOELV 72,88,96 CD156 R36/37 

Phorate (ISO) 298-02-2 0.05 0.2 Sk MS17 (including R27/28 


Phosgene 75-44-5 0.02 0.08 0.06 0.25 IOELV CD156 R26,34 

Phosphine 7803-51-2 0.3 0.42 EH64/D53 

Phosphorus, yellow 7723-14-0 0.1 0.3 

Phosphorus pentachloride 10026-13-8 0.1 0.87 ILV TR30 R22,26,34,48/20 

Phosphorus trichloride 7719-12-2 0.2 1.1 0.5 2.9 TR30 R26/28,35,48/20 

Phosphoryl trichloride 10025-87-3 0.2 1.3 0.6 3.8 TR30 R22,26,35,48/23 

Picloram (ISO) 1918-02-1 10 20 

Picric acid 88-89-1 0.1 0.3 ILV R23/24/25 

Piperidine 110-89-4 1 3.5 Sk 70 EH64/D54 R23/24,34 

Plaster of Paris 26499-65-0 



Platinum metal 

Platinum compounds 

7440-06-4 5 ILV 46/2 EH64/D86,EH65/24 

soluble (except 

certain halogeno-platinum 

compounds) (asPt) 

0.002 46/2 

Polyvinyl chloride 9002-86-2 14/3 EH31 



Portland cement 65997-15-1 14/3 EH64/D55,EH65/12 



Potassium hydroxide 1310-58-3 2 14/3 plus 

titrimetry 

EH64/D56 R22,35 

Propane 74-98-6 Asphyxiant 

- 15 -




Substance CAS ppm mg.m-³ ppm mg.m-³ Notes MDHS OEL summary & 

Number 


Propane-1,2-diol 

total (vapour and 

57-55-6 

particulates) 150 474 14/3 

EH64/D57 

(particulates) 

Health R phrases 

(in ASL) 

particulates 10 

Propan-1-ol 71-23-8 200 500 250 625 Sk 72,88,96 R41,67 

Propan-2-ol 67-63-0 400 999 500 1250 72,80,88,96 R36,67 

Propionic acid 79-09-4 10 31 15 46 IOELV R34 

Propoxur (ISO) 114-26-1 0.5 2 R25 

Propranolol 525-66-6 2 6 EH64/D87,EH65/18 

n-Propyl acetate 109-60-4 200 849 250 1060 72,88,96 R36,66,67 

Propylene 115-07-1 Asphyxiant 

Propylene dinitrate 6423-43-4 CHAN 36, Sk OES withdrawn 

Prop-2-yn-1-ol 107-19-7 1 2.3 3 7.0 Sk R23/24/25,34 

Pulverised fuel ash 14/3 EH44,EH64/D70, 

EH65/2 

total inahalable dust 10 


Pyrethrins (ISO) 8003-34-7 5 10 ILV 

Pyridine 110-86-1 5 16 10 33 ILV 72,88,96 R20/21/22 

2-Pyridylamine 504-29-0 0.5 2.0 2 7.8 

Pyrocatechol 120-80-9 5 23 R21/22,36/38 

Resorcinol 108-46-3 10 46 20 92 ILV 88 R22,36/38 

Rhodium (as Rh) 7440-16-6 

metal fume and dust 0.1 0.3 91 

soluble salts 0.001 0.003 

Rotenone (ISO) 83-79-4 5 10 R25,36/37/38 

Rouge 1309-37-1 14/3 



Selenium and compounds, 

except hydrogen selenide (as Se) 7782-49-2 0.1 91 EH64/D58 

Silane 7803-62-5 0.5 0.67 1 1.3 

- 16 -





Number 


Silica, amorphous 14/3 EH44 


respirable dust 2.4 

Silica, fused 60676-86- 

0 

respirable dust 0.08 14/3 EH44 

Silicon 7440-21-3 



*Silicon carbide (not whiskers) 409-21-2 14/3 



Silver compounds (as Ag) 0.01 ILV 91 EH64/D59 

Silver (metallic) 7440-22-4 0.1 IOELV 91 CD156 

Sodium azide (as NaN3) 

Sodium 2- 

26628-22- 

8 

0.1 0.3 New,IOELV,Sk 70 CD156 R28,32 

(2,4-dichlorophenoxy) 

ethyl sulphate 

136-78-7 10 20 

Sodium fluoroacetate 62-74-8 0.05 0.15 Sk R26/27/28 

Sodium hydrogen sulphite 7631-90-5 5 R22,31 

Sodium hydroxide 1310-73-2 2 14/3 EH64/D60 R35 

Starch 9005-25-8 14/3 



Stibine 7803-52-3 0.1 0.52 0.3 1.6 EH19 

Strychnine 57-24-9 0.15 0.45 R27/28 

Substilisins (proteolytic OES withdrawn 

enzymes as 100% pure 

crystalline enzyme) 

CHAN 24 14/3 EH44 

Sucrose 57-50-1 10 20 

Sulfotep (ISO) 3689-24-5 0.1 New,IOELV,Sk CD156,MS17 (including 


R27/28 

Sulphur dioxide 7446-09-5 CHAN 34 OES withdrawn R23,34 

* Potential users of silicon carbide whiskers should carefully consider the extremely hazardous nature of this material and whether less hazardous alternatives are available. If silicone carbide 

whiskers are used, it would be prudent to adopt a strict exposure regime as such that described for carcinogenic substances in the COSHH Regulations 1999. 

- 17 -





Number 


Sulphur hexafluoride 2551-62-4 1000 6070 1250 7590 

Sulphuric acid 7664-93-9 CHAN 25 OES withdrawn R35 

Sulphur tetrafluoride 7783-60-0 0.1 0.45 0.3 1.3 

Sulphuryl difluoride 2699-79-8 5 21 10 42 R23/25,36/37/38 

2,4,5-T (ISO) 93-76-5 10 20 R22,36/37/38 

TEPP (ISO) 107-49-3 0.004 0.05 0.01 0.12 Sk MS17 (including 


R27/28 

Talc 14807-96-6 

respirable dust 1 14/3 EH44,EH64/D92 

Tantalum 

Tellurium & compounds, 

7440-25-7 5 10 91 

except hydrogen 

telluride, (as Te) 

13494-80-9 0.1 91 

Terphenyls, all isomers 26140-60-3 0.5 4.8 EH64/D62 

1,1,2,2-Tetrabromoethane 79-27-6 0.5 7.2 Sk 96 R26,36 

Tetracarbonylnickel (as 

Ni) 

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

13463-39-3 0.1 0.24 EH60,TR19 R26,40,61 

2-difluoroethane 

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

76-11-9 100 847 100 847 88,96 

2-difluoroethane 76-12-0 100 847 100 847 88,96 

Tetrachloroethylene 127-18-4 50 345 100 689 72,80,88,96 EH64/93 R40 

Tetrachloronaphthalenes, 

all isomers 

1335-88-2 2 4 

Tetraethyl orthosilicate 

1,1,1,2-Tetrafluoroethane 

78-10-4 10 87 30 260 R20,36/37 

(HFC 134a) 811-97-2 1000 4240 EH64/D88,EH65/15 

Tetrahydrofuran 109-99-9 50 150 100 300 New,Sk,IOELV 88,96 CD156 & CD166, 

EH64/D89 

R36/37 

Tetramethyl orthosilicate 681-84-5 1 6.3 5 32 

Tetramethyl succinonitrile 3333-52-6 0.5 2.8 2 11 Sk 

Tetrasodium pyrophosphate 7722-88-5 5 

Thallium, soluble compounds 

(as Ti) 

7440-28-0 0.1 Sk 91 

Thionyl chloride 7719-09-7 1 4.9 R20/22,29,35 

Thiram (ISO) 137-26-8 5 10 R20/22,36/37,40,43 

- 18 -





Tin compounds, inorganic, 

Number 


Except SnH4, (as Sn) 7440-31-5 2 4 ILV 91 

Tin compounds, organic, 

except cyhexatin (ISO), 

(as Sn) 

0.1 0.2 Sk 

Titanium dioxide 13463-67-7 14/3 



Toluene 108-88-3 50 191 150 574 Sk 72,80,88,96 EH64/D63,TR20 R20 

p-Toluenesulphonyl chloride 

Tributyl phosphate, 

98-59-9 5 70 EH64/D64 

all isomers 126-73-8 5 5 R22 

Tricarbonyl (eta-cyclopentadienyl) 

manganese (as Mn) 

12079-65-1 0.1 0.3 Sk 

Tricarbonyl(methylcyclopentadienyl)manganese 

(as Mn) 

12108-13-3 0.2 0.6 Sk 

1,2,4-Trichlorobenzene 

1,1,1-Trichlorobis 

120-82-1 1 5 New,IOELV,Sk 28,72,80 CD166 

(chlorophenyl)ethane 50-29-3 1 3 

1,1,1-Trichloroethane 71-55-6 100 555 200 1110 New,IOELV 72,80,88,96 CD156,TR9 R20 

Trichlorofluoromethane 75-69-4 1000 5710 1250 7140 96 

Trichloronitromethane 76-06-2 0.1 0.68 0.3 2.1 R22,26,36/37/38 

1,2,3-Trichloropropane 96-18-4 50 306 75 460 96 R20/21/22 

1,1,2-Trichlorotrifluoroethane 76-13-1 1000 7790 1250 9740 80,88,96 

Triethylamine 121-44-8 2 8 4 17 New,IOELV,Sk CD157 R20/21/22,35 

Trimanganese tetraoxide 1317-35-7 1 CHAN 91 CD157 

Trimethylamine 

Trimethylbenzenes, 

75-50-3 10 25 15 37 R20,37/38,41 

all isomers or mixtures 25551-13-7 25 125 IOELV 72,80,88,96 EH64/D71,EH65/1 

- 19 -





3,5,5-Trimethylcyclohex- 

Number 


2-enone 78-59-1 5 29 72,88,96 EH64/D65 R21/22,36/37,40 

Trimethyl phosphite 121-45-9 2 10 

2,4,6-Trinitrotoluene 118-96-7 0.5 Sk 70 EH64/D66 R23/24/25,33 

Triphenyl phosphate 115-86-6 3 6 

Tri-o-tolyl phosphate 78-30-8 0.1 0.3 R39/23/24/25 

Tungsten & compounds (as W) 7440-33-7 91 

soluble 1 3 

insoluble 5 10 

Turpentine 8006-64-2 100 566 150 850 60 R20/21/22,36/38,43 

Uranium compounds 

natural, soluble, (as U) 7440-61-1 0.2 0.6 91 R26/28,33 

Vinyl acetate 108-05-4 10 36 20 72 88 

N-Vinyl pyrrolidone 88-12-0 CHAN EH64/D100 

Warfarin (ISO) 81-81-2 0.1 0.3 R48/25,61 

Welding fume 5 EH54,EH55 

Xylene, o-, m-, p- or 

mixed isomers 1330-20-7 50 220 100 441 New,Sk,IOELV 72,80,88,96 CD166,TR26 R20/21,38 

Xylidine, all isomers 1300-73-8 2 10 10 50 Sk R23/24/25,33 

Yttrium 7440-65-5 1 3 91 

Zinc chloride, fume 7646-85-7 1 2 91 

Zinc distearate 557-05-1 91 

total inhalable dust 10 20 


Zinc oxide, fume 1314-13-2 5 10 14/3 

Zirconium compounds (as Zr) 7440-67-7 5 10 91 

- 20 -

LIST OF APPROVED OCCUPATIONAL EXPOSURE STANDARDS ...

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