Substance |
8-hour time weighted average |
Acceptable ceiling concentration |
Acceptable maximum peak above the acceptable ceiling concentration for an 8-hr shift |
Concentration |
Maximum duration |
Benzene(a) (Z37.40-1969) |
10 ppm |
25 ppm |
50 ppm |
10 minutes. |
Beryllium and beryllium compounds (Z37.29-1970) |
2 ug/m(3) |
5 ug/m(3) |
25 ug/m(3) |
30 minutes. |
Cadmium fume(b) (Z37.5-1970) |
0.1 mg/m(3) |
0.3 mg/m(3) |
......... |
|
Cadmium dust(b) (Z37.5-1970) |
0.2 mg/m(3) |
0.6 mg/m(3) |
|
|
Carbon disulfide (Z37.3-1968) |
20 ppm |
30 ppm |
100 ppm |
30 minutes. |
Carbon tetrachloride (Z37.17-1967) |
10 ppm |
25 ppm |
200 ppm |
5 min. in any 3 hrs. |
Chromic acid and chromates (Z37-7-1971)(c) |
.......... |
1 mg/10 m(3) |
|
|
Ethylene dibromide (Z37.31-1970) |
20 ppm |
30 ppm |
50 ppm |
5 minutes. |
Ethylene dichloride (Z37.21-1969) |
50 ppm |
100 ppm |
200 ppm |
5 min. in any 3 hrs. |
Fluoride as dust (Z37.28-1969) |
2.5 mg/m(3) |
........... |
......... |
|
Formaldehyde: see 1910.1048 |
........... |
........... |
......... |
|
Hydrogen fluoride (Z37.28-1969) |
3 ppm |
.......... |
......... |
|
Hydrogen sulfide (Z37.2-1966) |
.......... |
20 ppm |
50 ppm |
10 mins. once only if no other meas. exp. occurs. |
Mercury (Z37.8-1971) |
.......... |
1 mg/10m(3) |
........ |
|
Methyl chloride (Z37.18-1969) |
100 ppm |
200 ppm |
300 ppm |
5 mins. in any 3 hrs. |
Methylene Chloride: see 1910.1052 |
|
|
|
|
Organo (alkyl) mercury (Z37.30-1969) |
0.01mg/m(3) |
0.04 mg/m(3) |
......... |
|
Styrene (Z37.15-1969) |
100 ppm |
200 ppm |
600 ppm |
5 mins. in any 3 hrs. |
Tetrachloroethylene |
100 ppm |
200 ppm |
300 ppm |
5 mins. in any 3 hrs. |
Toluene (Z37.12-1967) |
200 ppm |
300 ppm |
500 ppm |
10 minutes |
Trichloroethylene (Z37.19-1967) |
100 ppm |
200 ppm |
300 ppm |
5 mins. in any 2 hrs. |