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Highly flammable liquids and gases. 2 [THE SECOND SCHEDULE] (See section 41 F) PERMISSIBLE LEVELS OF CERTAIN CHEMICAL SUBSTANCES IN WORK ENVIRONMENT Permissible Limits of exposure Serial No. Substance Time-weighted average contraction (8 hrs.) Short-term exposure limit (15 min)* ppm Mg./mg** ppm Mg./m3** 1 2 3 4 5 6 (1) Acetaldehyde 100 180 150 270 (2) Acetic acid 10 25 15 37 (3) Acetone 750 1780 1000 2375 (4) Acrolin 0.1 0.25 0.3 0.8 (5) Acrylonitrile-Skin 2 4.5 - -- (6) Aldrin-skin - 0.25 - -- (7) Allyl chloride 1 3 2 6 (8) Ammonia 25 18 35 27 (9) Aniline-Skin 2 10 - - (10) Anisidine (o-p-isomers) Skin 0.1 0.5 - - (11) Arsenic & soluble compounds (As) - 0.2 - - (12) Benzene (S.C.) 10 30 - - (13) Beryllium & compound (as Be) (S,C) - 0.002 - - (14) Borontrifluride - C 1 3 - - (15) Bromine 0.1 0.7 0.3 2 (16) Butane 800 1900 - - (17) 2 - Butanone (Methyl Ethyl Ketene - MEEK) 200 590 300 835 (18) N-Butyl acetate 150 710 200 950 - (19) N-Butylealcohol-Skin-C 50 150 - - 2 Substituted by S.O. 170(E), dated 2nd March, 1989, Published in the Gazette of India, Extry., No. 107, dated 2-3-1989, Pt. II, Sec 3(ii) p. 6. (20) Sce/tert, Butly acetate 200 950 - - 1 2 3 4 5 6 (21) Butyl mercaptan 0.5 1.5 - - (22) Cadmium Dusts and salts (as Cd) - 0.05 - - (23) Calcium oxide - 2 - - (24) Carbaryl (Sevin) - 5 - - (25) Carbofuran (Furadan) - 0.1 - - (26) Carbon disolphide - Skin 10 30 - - (27) Carbon monoxide 50 55 400 440 (28) Carbon to tetrachloride-Skin (S.C.) 5 30 - - (29) Chlordane - Skin - 0.5 - - (30) Chlorine 1 3 3 9 (31) Chlorobenzene (Monochlorobenzene) 75 350 - - (32) Chloroform (S.C.) 10 50 - - (33) bis (Chronometry) ether (H.C.) 0.001 0.005 - - (34) Chromic acid and chromates (as Cr) - 0.05 - - (35) Chromous salts (as Cr) - 0.05 - - (36) Copper Fume - 0.2 - - (37) Cotton dust, raw3 - 0.2* - - (38) Cresol, all isomers-Skin 5 22 - - (39) Cyanides (as CN)-Skin - 5 - - (40) Cyanogen - 10 20 - (41) DDT (Dichlorodiphenyl trichloroethane) - 1 - - (42) Dometon-Skin 0.01 0.1 - - (43) Diazinon-Skin - 0.1 - - (44) Dibutyl phthalate - 5 - - (45) Dichlorvos (DDVP)-Skin 0.1 1 - - (46) Dieldrin-Skin - 0.25 - - (47) Dinitrobenzene (all isomers)- Skin 0.15 1 - - (48) Trinitrotoluene-Skin - 1.5 - - (49) Diphenyl- (Biphenyl) 0.2 1.5 - - 3 Lint-free dust as measured by the vertical elutriator cotton-dust sampler. (50) Endosulfan (Thiodan)-Skin - 0.1 - - 1 2 3 4 5 6 (51) Endrin-Skin - 0.1 - - (52) Ethyl acetate 400 1400 - - (53) Ethyl alcohol 1000 1900 - - (54) Ethylamine 10 18 - - (55) Fluorides (as F) - 2.5 - - (56) Fluorine 1 2 2 4 (57) Formaldehyde (S.C.) 1.0 1.5 2 3 (58) Formic acid 5 9 - - (59) Gasoline 300 900 500 1500 (60) Hydrazine-.Skin (S.C.) 0.1 0.1 - - (61) Hydrogen chloride-C 5 7 - - (62) Hydrogen cyamide-Skin-C 10 10 - - (63) Hydrogen fluoride (as F)-C 3 2.5 - - (64) Hydrogen peroxide 1 1.5 - - (65) Hydrogen sulphide 10 14 15 21 (66) Iodine-C 0.1 1 - - (67) Iron-Oxide Fume (F°20)) (as Fe - 5 - - (68) Isoamyl acetate 100 525 - - (69) Isoamyl alcohol 100 360 125 4500 (70) Isobutyl alcohol 50 150 - - (71) Lead, inorg, dusts and fumes (as Ph) - 0.15 - - (72) Lindane-Skin - 0.5 - - (73) Malathion-Skin - 10 - - (74) Manganese (as Mn) dust and compounds-C - 5 - - (75) Manganese fume (as Mn) - 1 - 3 (76) Mercury (as Hg)-Skin- (i) Alkyl compounds - 0.01 - 0.03 (ii) All forms except alkyl vapour - 0.05 - - (77) Aryl and inorganic compounds - 0.1 - - (78) Methyl alcohol (Methanol)- Skin 200 260 250 310 (79) Methyl Cellosolve (2- Methoxyethanol) Skin 5 16 - - (80) Methyl isobutyl ketone 50 205 75 300 1 2 3 4 5 6 (81) Methyl isocyanate - Skin 0.02 0.05 - - (82) Naphthalene 10 50 15 75 (83) Nickel carbonyl (as Ni) 0.05 0.35 - - (84) Nitric acid 2 5 4 10 (85) Nitric oxide 25 30 - - (86) Nitrobenzene-Skin 1 5 - - (87) Nitrogen dioxide 3 6 5 10 (88) Oil mist-mineral - 5 - 10 (89) Ozone 0.1 0.2 0.3 0.6 (90) Parathion-Skin - 0.1 - (91) Phenol-Skin 5 19 - - (92) Phorate (Thimet)-Skin - 0.05 - 0.2 (93) Phosgene (Carbonyl chloride) 0.1 0.4 - - (94) Phosphine 0.3 0.4 1 1 (95) Phosphoric acid - 1 - 3 (96) Phosphorus (yellow) - 0.1 - - (97) Phosphorus pentachloride 0.1 1 - - (98) Phosphorus trichloride 0.2 1.5 0.5 3 (99) Picric acid-Skin - 0.1 - 0.3 (100) Pyridine 5 15 - - (101) Silans (Silicon tetrahydride) 5 7 - - (102) Sodium hydroxide -C - 2 - - (103) Styrene, monomer (phenylethylene) 50 215 100 425 (104) Sulphur dioxide 2 5 5 10 (105) Sulphur hexafluoride 1000 6000 - - (106) Sulphuric acid - 1 - - (107) Tetraethyl lead (as Pb)-Skin - 0.1 - - (108) Toluene (Toluol) 100 375 150 560 (109) O - Toluidine - Skin (S.C.) 2 9 - - (110) Tributyphosphate 0.2 2.5 - - (111) Trichloroethylene 50 270 200 1080 (112) Uranium, natural (as U) - 0.2 - 0.6 (113) Vinyl chloride (H.C.) 5 10 - - (114) Welding fumes - 5 - - (115) Xylene (o-. m-, p-isomers) 100 435 150 655 (116) Zinc oxide- (i) Fume - 5.0 - 10 (ii) Dust (Total dust) - 10.0 - - (117) Zirconium compounds (as Zr) - 5 - 10 Ppm3 Parts of vapour or gas per million parts of contaminated air by volume at 25.C and 760 mm of Hg. mg/m2 milligrams of substance per cubic metre of air. * Not more than 4 times a day with at least 60 min. interval between successive exposures. ** Molecular weight mg/m2= --------------------------------------------------------------- xppm 24.45 G denotes ceiling limit. Skin denotes potential contribution to the overall exposure by the cutaneous route including mucous membranes and eye. S.C. denotes suspected human carcinogens. H.C. denotes confirmed human carcinogens. Substance Permissible time-weighted average concentration (TWA) (8 hours) Silica, SiO2 (a) Crystalline (i) Quartz 10600 (1) In term of mppcm dusts count ----------------------------- %Quartz+l0 (2) 10 In term of respirable -------------------------------- mg/m2 dust respirable Quartz+2 (3) 30 In term of ---------------------------- total dust ---- mg/m2 % Quartz+3 (ii) Cristobalite Half the limits given against quartz (iii) Triovmite Half the limits given against quartz (iv) Silica, fused Same limits as for quartz (v) Tripoli Same limit as in formula in item (2) given against quartz (b) Amorphous Silicate 10mg/m3, Total dust Asbestos (H.C.) *2 fibres/ml, greater than 5 urn in length and less than 3 um in breadth Portland cement 10 mg/m3, Total dust containing less than 1% quartz Coal Dust 2 mg/m3, respirable dust fraction containing less than 5% quartz mppcm-Million particles per cubic metre of air based on impinger samples counted by light- field techniques. *As determined by the membrane-fiter method at 400--- 450 x megnification (4 mm objective) phase contrast illumination. Respirable Dust: Fraction passing a size-selector with the following characteristics: Aerodynamic Diameter (u.m.) (Unit density sphere) %passing sector VI 2 90 2.5 75 3.5 50 5.0 25 10 0 1 [ THE THIRD SCHEDULE ] (See sections 89 and 90) LIST OF NOTIFIABLE DISEASES