Factories Act 1948
1THE SECOND SCHEDULE
(See Section 41-F)
Permissible Levels of Certain Chemical Substances in work environment.
Sr. No. | Substance | Permissible limits of exposure | |||
Time weighted average concentration (TWA)
(8hrs) |
Short term exposure limit (STEL)
(15 min) |
||||
ppm. | mg/m3** | 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 | 1,780 | 1,000 | 2,375 |
4. | Acrolein | 0.1 | 0.25 | 0.3 | 0.8 |
5. | Acrylonitrile-Skin (S.C.) | 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 As) | — | 0.2 | — | — |
2[12. | Benzene (H.C.) | 0.5 | 1.5 | 25 | 7.5 |
13. | Beryllium & compounds (as Be) (S.C.) | — | 0.002 | — | — |
14. | Boron trifluorid-C | 1 | 3 | — | — |
15. | Bromine | 0.1 | 0.7 | 0.3 | 2 |
16. | Butane | 800 | 1,900 | — | — |
17. | 2-Butanone (Methyl ethyl Ketone-MEK) | 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 (Lime) | — | 2 | — | — |
24. | Carbaryl (Sevin) | — | 5 | — | — |
25. | Carbofuran (Furadan) | — | 0.1 | — | — |
26. | Carbon disulphide-Skin | 10 | 30 | — | — |
1 Ins. by Act 20 of 1987, S.45 (w.e.f. 1.12.1987)
2 Subs. By S.O.342 (E) dt.19.4.2001 (w.e.f) 19.4.2001, Gaz. Of India Ext. No. 247, dt. 19.4.2001, Pt. II, sec.3 (ii).
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(Cont’d) – Page 2
Sr. No. | Substance | Permissible limits of exposure | |||
Time weighted average concentration (TWA)
(8hrs) |
Short term exposure limit (STEL)
(15 min) |
||||
ppm. | mg/m3** | ppm. | mg/m3**
|
||
1 | 2 | 3 | 4 | 5 | 6
|
27. | Carbon Monoxide | 50 | 55 | 400 | 440 |
28. | Carbon Tetrachloride Skin (S.C.) | 5 | 30 | — | — |
29. | Chlordane-Skin | — | 0.5 | — | 2 |
30. | Chlorine | 1 | 3 | 3 | 9 |
31. | Chlorobenzene (Monochlorobenzene) | 75 | 350 | — | — |
32. | Chloroform (S.C.) | 10 | 50 | — | — |
33. | bis (Chloromethyl) ether (H.C.) | 0.001 | 0.005 | — | — |
34. | Chromic acid and chromates (as Cr) (Water soluble) | — | 0.05 | — | — |
35. | Chromous salts (as Cr) | — | 0.5 | — | — |
36. | Copper Fume | — | 0.2 | — | — |
37. | Cotton dust, raw | — | 0.2*1 | — | — |
38. | Cresol, all isomers-Skin | 5 | 22 | — | — |
39. | Cyanide (as CN)-Skin | — | 5 | — | — |
40. | Cyanogen | 10 | 20 | — | — |
41. | DDT (Dichlorodiphenyl trichlorothane) | — | 1 | — | — |
42. | Demeton-Skin | 0.01 | 0.1 | — | — |
43. | Diazino-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. | 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 | 1,400 | — | — |
53. | Ethyl alcohol | 1,000 | 1,900 | — | — |
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 | 1,500 |
60. | Hydrazine-Skin (S.C.) | 0.1 | 0.1 | — | — |
1 *Lint-free dust as measured by the vertical elutricator cotton dust sampler.
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(Cont’d) – Page 3
Sr. No. | Substance | Permissible limits of exposure | |||
Time weighted average concentration (TWA)
(8hrs) |
Short term exposure limit (STEL)
(15 min) |
||||
ppm. | mg/m3** | ppm. | mg/m3**
|
||
1 | 2 | 3 | 4 | 5 | 6
|
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 | — | — |
65. | Hydrogen Sulphide | 10 | 14 | 15 | 21 |
66. | Iodine-C | 0.1 | 1 | — | — |
67. | Iron Oxide Fume (Fe2 O3) (as Fe) | — | 5 | — | — |
68. | Isoamyl acetate | 100 | 525 | — | — |
69. | Isoamyl Alcohol | 100 | 360 | 125 | 450 |
70. | Isobutyl alcohol | 50 | 150 | — | — |
71. | Lead, inorg, dusts & fumes (as Pb) | — | 0.15 | — | — |
72. | Lindane-Skin | — | 0.5 | — | — |
73. | Malathion-Skin | — | 10 | — | — |
74. | Manganese dust & compounds (Mn)-C | — | 5 | — | — |
75. | Manganese fume (as Mn) | — | 1 | — | 0.03 |
76. | 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 | — | — | |
77. | Methyl alcohol (Methanol)-Skin | 200 | 260 | 250 | 310 |
78. | Methyl cello solve (2-Metho-xyethanol)-Skin | 5 | 16 | — | — |
79. | Methyl isobutyl ketone | 50 | 205 | 75 | 300 |
80. | Methyl isocyanate-Skin | 0.02 | 0.05 | — | — |
81. | Naphthalene | 10 | 50 | 15 | 75 |
82. | Nickel carbonyl (as Ni) | 0.05 | 0.35 | — | — |
83. | Nitric Acid | 2 | 5 | 4 | 10 |
84. | Nitric oxide | 25 | 30 | — | — |
85. | Nitrobenzene-Skin | 1 | 5 | — | — |
86. | Nitrogen dioxide | 3 | 6 | 5 | 10 |
87. | Oil mist mineral | — | 5 | — | 10 |
88. | Ozone | 0.1 | 0.2 | 0.3 | 0.6 |
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(Cont’d) – Page 4
Sr. No. | Substance | Permissible limits of exposure | |||
Time weighted average concentration (TWA)
(8hrs) |
Short term exposure limit (STEL)
(15 min) |
||||
ppm. | mg/m3** | ppm. | mg/m3**
|
||
1 | 2 | 3 | 4 | 5 | 6
|
89. | Parathion-Skin | — | 0.1 | — | — |
90. | Phenol-Skin | 5 | 19 | — | — |
91. | Phorate (Thimet)-Skin | — | 0.05 | — | 0.2 |
92. | Phosgene (Carbonyl chloride) | 0.1 | 0.4 | — | — |
93. | Phosphine | 0.3 | 0.4 | 1 | 1 |
94. | Phosphoric acid (yellow) | — | 1 | — | 3 |
95. | Phosphorous (yellow) | — | 0.1 | — | — |
96. | Phosphorous pentachloride | 0.1 | 1 | — | — |
97. | Phosphorous trichloride | 0.2 | 1.5 | 0.5 | — |
98. | Picric acid-Skin | — | 0.1 | — | 0.3 |
99. | Pyridine | 5 | 15 | — | — |
100. | Silane (Silicon tetrahydride) | 5 | 7 | — | — |
101. | Sodium Hydroxide C | — | 2 | — | — |
102. | Styrene, monomer (Phenylethylene) | 50 | 215 | 100 | 425 |
103. | Sulphur dioxide | 2 | 5 | 5 | 10 |
104. | Sulphur hexafluoride | 1,000 | 6,000 | — | — |
105. | Sulphuric acid | — | 1 | — | — |
106. | Tetraethyl lead (as Pb)-Skin | — | 0.1 | — | — |
107. | Toluene (Toluol) | 100 | 375 | 150 | 560 |
108. | O-Toludine-Skin (S.C.) | 2 | 9 | — | — |
109. | Tributyl phosphate | 0.2 | 2.5 | — | — |
110. | Trichloroethylene | 50 | 270 | 200 | 1,080 |
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 |
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(Cont’d) – Page 5
Unit | Details
|
ppm | Parts particulate matter: Parts of vapour or gas per million parts of contaminated air by volume at 25o C
and 760 toor (mm of mercury)
|
mg/m3 | Milligram of substance per cubic metre of air
|
* | Not more than 4 times a day with at least 60 min. interval between successive exposures
|
** | mg/m3 Molecular weight
——————————- x ppm 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
|
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(Cont’d) – Page 6
Substance | Permissible time-weighted average concentration (TWA) (8hours)
|
Silica, (Si O2)
|
|
a. Crystalline
|
|
i. Quartz
|
|
(1) In terms of dust count | 10600
—————————— mppcm % Quartz + 10
|
(2) In terms of respirable dust | 10
—————————— mg/m3 % Quartz + 2
|
(3) In terms of total dust | 30
—————————— mg/m3 % Quartz + 3
|
ii. Cristobalite | Half the limits given against quartz
|
iii. Tridimite | 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
|
1[b. Amorphous Silicates | 10 mg/m3, Total dust
|
Asbestos (H.C.) |
|
a. Amosite | 0.1 fibre/cc***
|
b. Chrysolite | 0.1 fibre/cc***
|
c. Crocidolite | 0.1 fibre/cc***
|
c. Portland cement: | 10 mg/m3, Total dust containing less than 1% quartz
|
d. Coal Dust | 2 mg/m3, respirable dust fraction containing less than 5% quartz
|
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(Cont’d) – Page 7
Unit | Details
|
Mppcm | Million particles per cubic metre of air, based on impinge samples counted by light field techniques
|
*** | i. For fibres greater than 5 micro metre in length and less than 5 micro metre in breadth with length to breadth ration equal to or greater than 3:1.
|
ii. As determined by the membrane filter method at 400-450 x magnification (4mm objective) phase contrast illumination.]
|
Substance | Details
|
Respirable Dust | Fraction passing a size-selector with the following characteristics:
|
Aerodynamic Diameter (Micro Metre) (Unit density sphere) |
% passing selector |
< or = 2 | 90
|
2.5 | 75
|
3.5 | 50
|
5.0 | 25
|
10 | 0
|
1 Subs. by S.O. 3422 (E) dt. 04.11.2013 (w.e.f.) 12.11.2013, Gaz. Of India, Ext. No. 2582,
- 12.11.2013, Pt. II, sec. 3 (ii)