beta-Chloroprene — CAS 126-99-8 — workplace exposure limit
What is the pel (ppm) for beta-Chloroprene — CAS 126-99-8 — workplace exposure limit?
For beta-Chloroprene, pel (ppm) is disputed: 25 per osha.gov, 10 per dir.ca.gov; pel (mg/m³) is disputed: 90 per osha.gov, 36 per dir.ca.gov; cas no. is 126-99-8, verified against its source on 2026-08-05.
beta-Chloroprene | 126-99-8 | 25 | 90 | X |
— osha.gov, retrieved 2026-08-05
- Substance
- beta-Chloroprene verified
- CAS No.
- 126-99-8 verified
- PEL (ppm)
- 25 sources disagree
- PEL (mg/m³)
- 90 sources disagree
- NIOSH REL (ppm)
- C 1 per cdc.gov
- NIOSH REL (mg/m³)
- 3.6 per cdc.gov
What cdc.gov says
NIOSH REL Ca C 1 ppm (3.6 mg/m3) [15-minute]
— cdc.gov, retrieved 2026-09-08
Substance
CDC - NIOSH Pocket Guide to Chemical Hazards - beta-Chloroprene
CAS No.
CAS No. 126-99-8
What dir.ca.gov says
126998 | S | 2-Chloro-1,3-butadiene; see Chloroprene
— dir.ca.gov, retrieved 2026-08-05
Sources disagree
More than one authority states this, and they do not state the same thing. Both are reproduced with the source each came from — deciding between them is yours, not ours.
PEL (ppm)
osha.gov says pel (ppm) is 25, as of 2026-08-05.
beta-Chloroprene | 126-99-8 | 25 | 90 | X |
https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1
dir.ca.gov says pel (ppm) is 10, as of 2026-08-05.
126998 | S | Chloroprene; 2-chloro-1,3-butadiene | 10 | 36
https://www.dir.ca.gov/title8/5155.html
PEL (mg/m³)
osha.gov says pel (mg/m³) is 90, as of 2026-08-05.
beta-Chloroprene | 126-99-8 | 25 | 90 | X |
https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1
dir.ca.gov says pel (mg/m³) is 36, as of 2026-08-05.
126998 | S | Chloroprene; 2-chloro-1,3-butadiene | 10 | 36
Sources
- osha.govhttps://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1
- cdc.govhttps://www.cdc.gov/niosh/npg/npgd0133.html
- dir.ca.govhttps://www.dir.ca.gov/title8/5155.html