Hexachlorocyclopentadiene — workplace exposure limit
What is the pel (ppm) for Hexachlorocyclopentadiene — workplace exposure limit?
For Hexachlorocyclopentadiene, pel (ppm) is 0.01; pel (mg/m³) is 0.11; cas no. is 77474, verified against its source on 2026-08-05.
77474 | | Hexachlorocyclopentadiene | 0.01 | 0.11
— dir.ca.gov, retrieved 2026-08-05
0.01
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
- Hexachlorocyclopentadiene verified
- CAS No.
- 77474 verified
- PEL (ppm)
- 0.01 verified
- PEL (mg/m³)
- 0.11 verified
- NIOSH REL (ppm)
- TWA 0.01 per cdc.gov
- NIOSH REL (mg/m³)
- 0.1 per cdc.gov
What cdc.gov says
NIOSH REL TWA 0.01 ppm (0.1 mg/m3)
— cdc.gov, retrieved 2026-09-08
Sources
- dir.ca.govhttps://www.dir.ca.gov/title8/5155.html
- cdc.govhttps://www.cdc.gov/niosh/npg/npgd0315.html