Methylcyclohexanol — CAS 25639-42-3 — workplace exposure limit
What is the pel (ppm) for Methylcyclohexanol — CAS 25639-42-3 — workplace exposure limit?
For Methylcyclohexanol, pel (ppm) is disputed: 100 per osha.gov, 50 per dir.ca.gov; pel (mg/m³) is disputed: 470 per osha.gov, 235 per dir.ca.gov; cas no. is 25639-42-3, verified against its source on 2026-08-05.
Methylcyclohexanol | 25639-42-3 | 100 | 470 | - |
— osha.gov, retrieved 2026-08-05
- Substance
- Methylcyclohexanol verified
- CAS No.
- 25639-42-3 verified
- PEL (ppm)
- 100 sources disagree
- PEL (mg/m³)
- 470 sources disagree
- NIOSH REL (ppm)
- TWA 50 per cdc.gov
- NIOSH REL (mg/m³)
- 235 per cdc.gov
What cdc.gov says
NIOSH REL TWA 50 ppm (235 mg/m3)
— cdc.gov, retrieved 2026-09-08
Substance
CDC - NIOSH Pocket Guide to Chemical Hazards - Methylcyclohexanol
CAS No.
CAS No. 25639-42-3
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 100, as of 2026-08-05.
Methylcyclohexanol | 25639-42-3 | 100 | 470 | - |
https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1
dir.ca.gov says pel (ppm) is 50, as of 2026-08-05.
25639423 | | Methylcyclohexanol (meta- and para-isomer mixture) | 50 | 235
https://www.dir.ca.gov/title8/5155.html
PEL (mg/m³)
osha.gov says pel (mg/m³) is 470, as of 2026-08-05.
Methylcyclohexanol | 25639-42-3 | 100 | 470 | - |
https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1
dir.ca.gov says pel (mg/m³) is 235, as of 2026-08-05.
25639423 | | Methylcyclohexanol (meta- and para-isomer mixture) | 50 | 235
Sources
- osha.govhttps://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1
- cdc.govhttps://www.cdc.gov/niosh/npg/npgd0407.html
- dir.ca.govhttps://www.dir.ca.gov/title8/5155.html