Annexure 2.1 EHS Guidelines
Rev.76, 202517
PERMISSIBLE LEVELS OF CERTAIN CHEMICAL
SUBSTANCES IN WORK ENVIRONMENT
Permissible limits of exposure
--------------------------------------
Sl.No. Substance Time-weighted Short Term
Average concentration exposure limit
(TWA) (8 hrs.) (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
____________________________________________________________________________________________________________________
As per Second Schedule of the Factories Act 1948, Section 41-F or permissible levels from respective state specific rules to be followed
____________________________________________________________________________________________________________________
Page 1 of 9
, Annexure 2.1 EHS Guidelines
Rev.76, 202517
1. 2. 3. 4. 5. 6. __
(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 --- ---
(12) Benzene (H.C.) 0.5 1.5 25 7.5
(13) Beryllium & compounds (as Be) (S.C.) --- 0.002 --- ---
(14) Boron trifluoride – 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 --- 2 --- ---
(24) Carbaryl (Sevin) --- 5 --- ---
(25) Carbofuran (Furadan) --- 0.1 --- ---
____________________________________________________________________________________________________________________
Page 2 of 9
Rev.76, 202517
PERMISSIBLE LEVELS OF CERTAIN CHEMICAL
SUBSTANCES IN WORK ENVIRONMENT
Permissible limits of exposure
--------------------------------------
Sl.No. Substance Time-weighted Short Term
Average concentration exposure limit
(TWA) (8 hrs.) (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
____________________________________________________________________________________________________________________
As per Second Schedule of the Factories Act 1948, Section 41-F or permissible levels from respective state specific rules to be followed
____________________________________________________________________________________________________________________
Page 1 of 9
, Annexure 2.1 EHS Guidelines
Rev.76, 202517
1. 2. 3. 4. 5. 6. __
(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 --- ---
(12) Benzene (H.C.) 0.5 1.5 25 7.5
(13) Beryllium & compounds (as Be) (S.C.) --- 0.002 --- ---
(14) Boron trifluoride – 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 --- 2 --- ---
(24) Carbaryl (Sevin) --- 5 --- ---
(25) Carbofuran (Furadan) --- 0.1 --- ---
____________________________________________________________________________________________________________________
Page 2 of 9
