Hexachlorobutadiene — workplace exposure limit
What is the pel (ppm) for Hexachlorobutadiene — workplace exposure limit?
For Hexachlorobutadiene, pel (ppm) is 0.02; pel (mg/m³) is 0.24; cas no. is 87683, verified against its source on 2026-08-05.
87683 | S | Hexachlorobutadiene | 0.02 | 0.24
— dir.ca.gov, retrieved 2026-08-05
0.02
The most of this substance workplace air may legally contain, averaged over an 8-hour shift — OSHA's permissible exposure limit (PEL), in parts per million, from the agency's own table row quoted below. Where federal OSHA and Cal/OSHA disagree, both limits are stated, each with its own agency's table row as evidence. NIOSH's number, where there is one, is shown separately: it is a recommended limit, not a legal one, and it is often the strictest of the three.
- Substance
- Hexachlorobutadiene verified
- CAS No.
- 87683 verified
- PEL (ppm)
- 0.02 verified
- PEL (mg/m³)
- 0.24 verified
- NIOSH REL (ppm)
- TWA 0.02 per cdc.gov
- NIOSH REL (mg/m³)
- 0.24 per cdc.gov
What cdc.gov says
NIOSH REL Ca TWA 0.02 ppm (0.24 mg/m3) [skin]
— cdc.gov, retrieved 2026-09-08
Sources
- dir.ca.govhttps://www.dir.ca.gov/title8/5155.html
- cdc.govhttps://www.cdc.gov/niosh/npg/npgd0314.html