1,1,1,2-Tetrachloro-2,2-difluoroethane — workplace exposure limit
What is the pel (ppm) for 1,1,1,2-Tetrachloro-2,2-difluoroethane — workplace exposure limit?
For 1,1,1,2-Tetrachloro-2,2-difluoroethane, pel (ppm) is 500; pel (mg/m³) is 4170; cas no. is 76-11-9, verified against its source on 2026-08-05.
1,1,1,2-Tetrachloro-2,2-difluoroethane | 76-11-9 | 500 | 4170 | - |
— osha.gov, retrieved 2026-08-05
500
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
- 1,1,1,2-Tetrachloro-2,2-difluoroethane verified
- CAS No.
- 76-11-9 verified
- PEL (ppm)
- 500 verified
- PEL (mg/m³)
- 4170 verified
- NIOSH REL (ppm)
- TWA 500 per cdc.gov
- NIOSH REL (mg/m³)
- 4170 per cdc.gov
What dir.ca.gov says
76119 | | 1,1,1,2-Tetrachloro-2,2-difluoroethane | 500 | 4170
— dir.ca.gov, retrieved 2026-08-05
What cdc.gov says
NIOSH REL TWA 500 ppm (4170 mg/m3)
— cdc.gov, retrieved 2026-09-08
Sources
- osha.govhttps://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1
- dir.ca.govhttps://www.dir.ca.gov/title8/5155.html
- cdc.govhttps://www.cdc.gov/niosh/npg/npgd0595.html