Factories Act
(See Rule 41-F)
PERMISSIBLE LEVELS OF CERTAIN CHEMICAL SUBSTANCES IN WORK ENVIRONMENT
Serial No. |
Substance |
Permissible limits of exposure |
||||
Time-weighted average Concentration (TWA) (8 hrs.) |
Short-term exposure limit (STEL) (15 min.)* |
|||||
|
|
ppm |
Mg/m3** |
ppm |
Mg/m3** |
|
(1) |
Acetaldehyde |
100 |
180 |
150 |
270 |
|
(2) |
Acetic Acid |
10 |
25 |
15 |
37 |
|
(3) |
Acetone |
750 |
1780 |
1000 |
2375 |
|
(4) |
Acrolein |
0.1 |
0.25 |
0.3 |
0.8 |
|
(5) |
Acrylonitrile--skin |
2 |
4.5 |
-- |
-- |
|
(6) |
Aldrin Skin |
-- |
0.25 |
-- |
0.75 |
|
(7) |
Allyl Chloride |
1 |
3 |
2 |
6 |
|
(8) |
Ammonia |
25 |
18 |
35 |
27 |
|
(9) |
Aniline---skin |
2 |
10 |
-- |
-- |
|
(10) |
Anisidine (o-pisomers)--Skin |
0.1 |
0.5 |
-- |
-- |
|
(11) |
Arsenic & Compounds (as As) |
-- |
0.2 |
-- |
-- |
|
(12) |
Benzene (H.C.) |
0.5 |
1.5 |
25 |
7.5 |
|
(13) |
Beryllium & compounds *as Be) (S.C.) |
-- |
0.002 |
-- |
-- |
|
(14) |
Boron trifluride |
1 |
3 |
-- |
-- |
|
(15) |
Bromine |
0.1 |
0.7 |
0.3 |
2 |
|
(16) |
Butane |
800 |
1900 |
-- |
-- |
|
(17) |
2 Butanon (Methyl-ethyle Ketone-MBK) |
200 |
590 |
300 |
885 |
|
(18) |
n-Butyl acetate |
150 |
710 |
200 |
950 |
|
(19) |
n-Butyl alcohol—skin—C |
50 |
150 |
-- |
-- |
|
(20) |
Sec/tert. Butyl Acetate |
200 |
950 |
-- |
-- |
|
(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 disulphide—Skin |
10 |
30 |
-- |
-- |
|
(27) |
Carbon monoxide |
50 |
55 |
400 |
440 |
|
(28) |
Carbon terrachloride—Skin (S.C.) |
5 |
30 |
- |
- |
|
(29) |
Chlorodane-skin |
-- |
0.5 |
-- |
2 |
|
(30) |
Chlorine |
1 |
3 |
3 |
9 |
|
(31) |
Chlorobenzene (Monochlorobenzene) |
75 |
350 |
-- |
-- |
|
(32) |
Chloroform |
10 |
50 |
-- |
-- |
|
(33) |
bis (Chloromethyl ether (H.C.) |
0.001 |
0.005 |
-- |
-- |
|
(34) |
Chromic acid and chromates (as Cr) |
-- |
0.05 |
-- |
-- |
|
(35) |
Chromic salts (as Cr) |
-- |
0.5 |
-- |
-- |
|
(36) |
Copper fume |
-- |
0.2 |
-- |
-- |
|
(37) |
Cotton dust, raw |
-- |
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) |
Demeron—Skin |
0.01 |
0.1 |
-- |
-- |
|
(43) |
Diazinon—Skin |
-- |
0.1 |
-- |
-- |
|
(44) |
Dibutyl Phthalate |
-- |
5 |
-- |
-- |
|
(45) |
Dicholorvos (DDVP)—Skin |
0.1 |
1 |
-- |
-- |
|
(46) |
Dieldrin—Skin |
-- |
0.25 |
-- |
-- |
|
(47) |
Dinitrobenzene (all isomers) –Skin |
0.15 |
1 |
-- |
-- |
|
(48) |
Dinitrotoluene—Skin |
-- |
1.5 |
-- |
-- |
|
(49) |
Diphenyl (Biphenyl) |
0.2 |
1.5 |
-- |
-- |
|
(50) |
Endosulfan (Thiodan)—Skin |
-- |
0.1 |
-- |
-- |
|
(51) |
Endrin—Skin |
-- |
0.1 |
-- |
-- |
|
(52) |
Ethyl acetate |
400 |
1400 |
-- |
-- |
|
(53) |
Ethyl alcohol |
1000 |
1900 |
-- |
-- |
|
(54) |
Ethylamin |
10 |
18 |
-- |
-- |
|
(55) |
Fluorides (as F) |
-- |
2.5 |
-- |
-- |
|
(56) |
Flourine |
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 cyanide—skin C |
10 |
10 |
-- |
-- |
|
(63) |
Hydrogen fluoride (as F)—C |
3 |
2.5 |
-- |
-- |
|
(64) |
Hydrogen peroxide |
1 |
1.5 |
-- |
-- |
|
(66) |
Hydrogen Sulphide |
10 |
14 |
15 |
21 |
|
(67) |
Iodine-C |
0.1 |
1 |
-- |
-- |
|
(68) |
Iron Oxide Fume (Fe2O3) (as Fe) |
-- |
5 |
-- |
-- |
|
(69) |
Isoamyl acetate |
100 |
525 |
-- |
-- |
|
(70) |
Isoamyl alcohol |
100 |
360 |
125 |
450 |
|
(71) |
Isobutyl alcohol |
50 |
150 |
-- |
-- |
|
(72) |
Lead, inorg, dusts and fames (as Pb) |
-- |
0.15 |
-- |
-- |
|
(73) |
Lindane—Skin |
-- |
0.5 |
-- |
-- |
|
(74) |
Malathion—Skin |
-- |
10 |
-- |
-- |
|
(75) |
Manganese (as Mn) dust and compounds-C |
-- |
5 |
-- |
-- |
|
(76) |
Manganese Fume (as Mn) |
-- |
1 |
-- |
3 |
|
(77) |
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 |
-- |
-- |
||
(78) |
Methyl alcohol (Mathanol)-Skin |
200 |
260 |
250 |
310 |
|
(79) |
Methyl cellosolve (2-Methoxyethanol) -Skin |
5 |
16 |
-- |
-- |
|
(80) |
Methyl isobutyl Ketone-Skin |
50 |
205 |
75 |
300 |
|
(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) |
Nitrobenzen—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 (yellow) |
-- |
1 |
-- |
3 |
|
(96) |
Phosphorus pentachloride |
0.1 |
1 |
-- |
-- |
|
(97) |
Phosphorus trichloride |
0.2 |
1.5 |
0.5 |
3 |
|
(98) |
Picric acid—Skin |
-- |
0.1 |
-- |
0.3 |
|
(99) |
Pyridine |
5 |
15 |
-- |
-- |
|
(100) |
Silane (silicon tetrahydride) |
5 |
7 |
-- |
-- |
|
(101) |
Sodium hydroxide—C |
-- |
2 |
-- |
-- |
|
(102) |
Syrene, monomer (Phenylethylen) |
50 |
215 |
100 |
425 |
|
(103) |
Sulphur dioxide |
2 |
5 |
5 |
10 |
|
(104) |
Sulphur hexafluoride |
1000 |
6000 |
-- |
-- |
|
(105) |
Sulphuric acid |
-- |
1 |
-- |
-- |
|
(106) |
Tetraethyl lead (as Pb) – Skin |
-- |
0.1 |
-- |
-- |
|
(107) |
Tolune (Toluol) |
100 |
375 |
150 |
560 |
|
(108) |
O-Tuluidine—Skin (S.C.) |
2 |
9 |
-- |
-- |
|
(109) |
Tributyl phosphate |
0.2 |
2.5 |
-- |
-- |
|
(110) |
Trichloroethylene |
50 |
270 |
200 |
1080 |
|
(111) |
Uranium, natural (as U) |
-- |
0.2 |
-- |
0.6 |
|
(112) |
Vinyl chloride (H.C.) |
5 |
10 |
-- |
-- |
|
(113) |
Welding fumes |
-- |
5 |
-- |
-- |
|
(114) |
Xylene (o-,m-,p-isomers) |
100 |
435 |
150 |
655 |
|
(115) |
Zinc oxide |
|
|
|
|
|
(i) Fume |
-- |
5.0 |
-- |
10 |
||
(ii) Dust (Total dust) |
-- |
10.00 |
-- |
-- |
||
(116) |
Zirconium compounds (as Zr) |
-- |
5 |
-- |
10 |
|
|
|
|
|
|
|
|
*Not more than 4 times a day with at least 60 min. interval between successive exposures.
*Lint-free dust as measured by the vertical elutriator cotton-dust sampler
ppm, |
Parts of vapour or gas prmillion parts of contaminated air by volume at 250 C and 760 mm of Hg. |
Mg/m3 |
Milligra of substance per cubic metere of air |
* |
Note more than 4 time a day wit at least 60 min. interval between successive exposure. |
** |
Molecular weight Mg/m3------------------------- x ppm 24.45 |
G |
Denotes Ceiling Limit |
Skin |
Denote potential contribution to the overall exposure – by the cutaneous route including mucous membrances and eye |
S.C. |
Denotes Suspected Human Carcinogen |
H.C. |
Denote Confirmed Human Carcinogen |
C |
Denotes ceiling limits. |
Substance |
Permissible time – weighted Average concentration (TWA) 8 hours |
|
(i) |
Silica SiO2 (a) Crystalline (i) Quartz 10600 (1) In terms of dust count -------------------- mppcm % Quartz + 10
10 (2) In terms of respirable dust --------------------------------- mg/m3 % respirable quartz + 2 30 (3) In terms of total dust ------------------------ mg/m3 % quartz + 3 |
|
|
(ii) Cristabalite |
Half the limits given against quartz |
|
(iii) Tridymite |
Half the limits given against guartz |
|
(iv) Silica fused |
Same limit as for quartz. |
|
(v) Tripoli
|
Same limit as in formula in item 2 given against quartz. |
|
(b) Amorphous Silicates |
10 mg/m3 Total dust |
|
Asbestos (H.C.) |
(a) Amonite - 0.5 fibre/cc *** |
|
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.
*** (i) For fibres greater than five microns in length and less than 5
microns in breadth with length to breadth ratio equal to or no greater than
3:1.
(ii) As determined by the membrane filter method at 400-450x magnification (5
mm objective) phase contrast illumination.
Respirable Dust :
Fraction passing a size - selector with the following characteristics :
Aerodynamic Diameter (u m) (unit density sphere) |
% passing selector |
2 |
90 |
2.5 |
75 |
3.5 |
50 |
5.0 |
25 |
10 |
0 |