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Highly flammable liquids and gases. 58 THE SECOND SCHEDULE (Seesection 41 F) PERMISSIBLE LEVELS OF CERTAIN CHEMICAL SUBSTANCES IN WORK ENVIRONMENT Substance Permissible limits of exposure Time-weighted average concentration (8 hrs) Short-term exposure limit (15 min) ppm Mg/m3 ppm Mg/m3 Acetaldehyde 100 180 150 270 Acetic acid 10 25 15 37 Acetone 750 1780 1000 2375 Acrolein 0.1 0.25 0.3 0.8 Acrylonitrile-Skin (S.C.) 2 4.5 . . . . Aldrin-skin . . 0.25 . . 0.75 Allychloride 1 3 2 6 Ammonia 25 18 35 27 Aniline-Skin 2 10 . . . . Anisidine (o-,p-isomers) Skin 0.1 0.5 . . . . Arsenic A soluble compounds (as As) . . 0.2 . . . . Benzene (S.C.) 05 1.5 25 7.5 Beryllium & Compound (as Be) (S.C.) . . 0.002 . . . . Boron trifluoride-C 1 3 . . . . Bromine 0.1 0.7 0.3 2 Butane 800 1900 . . . . 2-Butanone (Methyl-ethyl Ketone-MEK) 200 590 300 835 n-Butyl acetate 150 710 200 950 n-Butyle alcohol-Skin-C 50 150 . . . . sec/tert. Butylacetate 200 950 . . . . Butyl mercaptan 0.5 1.5 . . . . Cadmium Dusts and salts (as Cd) . . 0.05 . . . . Calcium oxide . . 2 . . . . Carbaryl (Sevin) . . 5 . . . . Carbofuran (Furadan) . . 0.1 . . . . Carbon disulphade-Skin 10 30 . . . . 59 ppm Mg/m3 ppm Mg/m3 Carbon monoxide 50 55 400 440 Carbon tetrachloride-Skin (S.C.) 5 30 . . . . Chlordane-Skin . . 0.5 . . . . Chlorine 1 3 3 9 Chlorobenzene (Monochlorobenzene) 75 350 . . . . Chloroform (S.C.) 10 50 . . . . bis (Chloromethyl) ether (H.C.) 0.001 0.005 . . . . Chromic acid and chromates (as Cr) (Water Soluble) . . 0.05 . . . . Chromous salts (as Cr) . . 0.05 . . . . Copper Fume . . 0.2 . . . . Cotton dust, raw . . 0.2 . . 0.6 Crosol, all isomers—Skin 5 22 . . . . Cyanides (as CN)—Skin . . 5 . . . . Cyanogen 10 20 . . . . DDT (Dichlorodiphenyltrichloroethane) . . 1 . . 3 demeron-Skin 0.01 0.1 0.03 0.3 Diazinon-Skin . . 0.1 . . 0.3 Dibutylphthalale . . 5 . . 10 Dichlorvos (DDVP)—Skin 0.1 1 0.3 3 Dieldrin—Skin . . 0.25 . . 0.75 Dinitrobenzene (all isomers)—Skin 0.15 1 0.5 3 Dinitrotolune-Skin . . 1.5 . . 5 Diphenyl-(Biphenyl) 0.2 1.5 0.6 4 Endosulfan (Thiodan)—Skin . . 0.1 . . 0.4 Endrin—Skin . . 0.1 . . 0.3 Ethyl acetate 400 1400 . . . . Ethyl alcohol 1000 1900 . . . . Ethylamine 10 18 . . . . Fluorides (as F) . . 2.5 . . . . Fluorine 1 2 2 4 Formaldehyde (S.C.) 1.0 1.5 2 3 Formic acid 5 9 . . . . Gasoline 300 900 500 1500 Hydrazine—Skin (S.C.) 0.1 0.1 . . . . Hydrogen chloride—C 5 7 . . . . 60 ppm Mg/m3 ppm Mg/m3 Hydrogen cyanide—Skin—C 10 10 . . . . Hydrogen fluoride (as F)—C 3 2.5 . . . . Hydrogen peroxide 1 1.5 . . . . Hydrogen sulphide 10 14 15 21 Iodine—C 0.1 1 . . . . Iron-Oxide Fume (Fe2O3) (as Fe) . . 5 . . . . Isoamyl acetate 100 525 . . . . Isoamyl alcohol 100 360 125 4500 Isobutyl alcohal 50 150 . . . . Lead, inorg, dusts and fumes (as Pb) . . 0.15 . . . . Lindane-Skin . . 0.5 . . . . Malathion-Skin . . 10 . . . . Manganese dust and compounds (as Mn)—C . . 5 . . . . Manganese fume (as Mn) . . 1 . . 3 Mercury (as Hg)—Skin— (i) Alkyl compounds . . 0.01 . . 0.03 (ii) All forms except alkyl vapour . . 0.05 . . . . (iii) Aryl and inorganic compounds . . 0.1 . . . . Methyl alcohol (Methanol)—Skin 200 260 250 310 Methyl Cellosolve (2-Methoxy-ethanol) Skin 5 16 . . . . Methyl isobutyl ketone 50 205 75 300 Methyl isocyanate-Skin 0.02 0.05 . . . . Napthalene 10 50 15 75 Nickel carbonyl (as Ni) 0.05 0.35 . . . . Nitric acid 2 5 4 10 Nitric oxide 25 30 . . . . Nitrobenzene—Skin 1 5 . . . . Nitrogen dioxide 3 6 5 10 Oil mist-mineral . . 5 . . 10 Ozone 0.1 0.2 0.3 0.6 Parathion—Skin . . 0.1 . . . . Phenol—Skin 5 19 . . . . Phorate (Thimet)—Skin . . 0.05 . . 0.2 Phosgene (Carbonyl chloride) 0.1 0.4 . . . . Phosphine 0.3 0.4 1 1 61 ppm Mg/m3 ppm Mg/m3 Phosphoric acid . . 1 . . 3 Phosphorus (yellow) . . 0.1 . . . . Phosphorus pentachloride 0.1 1 . . . . Phosphorus trichloride 0.2 1.5 0.5 3 Picric acid—Skin . . 0.1 . . 0.3 Pyridine 5 15 . . . . Silane (Silicon tetrahydride) 5 7 . . . . Sodium hydroxide—C . . 2 . . . . Styrene, monomer (Phenylethylene) 50 215 100 425 Sulphur dioxide 2 5 5 10 Sulphur hexafluoride 1000 6000 . . . . Sulphuric acid . . 1 . . . . Tetraethyl lead (as Pb)—Skin . . 0.1 . . . . Toluene (Toluol) 100 375 150 560 O—Toluidinz—Skin (S.C.) 2 9 . . . . Tributyl phosphate 0.2 2.5 . . . . Trichloroethylene 50 270 200 1080 Uranium, natural (as U) . . 0.2 . . 0.6 Vinyl chloride (H.C.) 5 10 . . . . Welding fumes . . 5 . . . . Xylene (o-, m-, p-isomers) 100 435 150 655 Zinc oxide— (i) Fume . . 5.0 . . 10 (ii) Dust (Total dust) . . 10.0 . . . . Zirconium compounds (as Zr) . . 5 . . 10 C denotes ceiling limit *Not more than 4 times a day with at least 60 min. interval between successive exposures. Substance Permissible (8 hours) Time- weighted average concentration (i) Silica (a) Crystalline (b) Quartz (1) In term of dusts count 10600 mppcm % Quartz+10 62 Substance Permissible (8 hours) Time- weighted average concentration (2) In terms of respirable dust (3) In terms of total dust 10 mg/m3 % respirable quartz+2 10 mg/m3 % Quartz+3 (ii) Cristobalite Half the limits given against quartz. (iii) Tridymite Half the limits given against quartz. (iv) Silica, fused Same limits as for quartz. (v) (a) Tripoli Same limit as in formula in item 2 given against quartz. (b) Amorphous 705 mppcm.] ___________ 63 1[THE THIRD SCHEDULE] (See sections 89 and 90) LIST OF NOTIFIABLE DISEASES