2-Hexanone — CAS 591-78-6 — workplace exposure limit
What is the niosh rel (ppm) for 2-Hexanone — CAS 591-78-6 — workplace exposure limit?
For 2-Hexanone, niosh rel (ppm) is TWA 1; niosh rel (mg/m³) is 4; cas no. is 591-78-6, verified against its source on 2026-09-08.
NIOSH REL TWA 1 ppm (4 mg/m3)
— cdc.gov, retrieved 2026-09-08
- Substance
- 2-Hexanone verified
- CAS No.
- 591-78-6 verified
- NIOSH REL (ppm)
- TWA 1 verified
- NIOSH REL (mg/m³)
- 4 verified
- PEL (ppm)
- 100 per osha.gov
- PEL (mg/m³)
- 410 per osha.gov
- STEL (ppm)
- 10 per dir.ca.gov
- STEL (mg/m³)
- 40 per dir.ca.gov
Where each value comes from
This source states these in separate places, so each value is shown with the passage that states it.
Substance
CDC - NIOSH Pocket Guide to Chemical Hazards - 2-Hexanone
CAS No.
CAS No. 591-78-6
— all from cdc.gov, retrieved 2026-09-08
What osha.gov says
2-Hexanone (Methyl n-butyl ketone) | 591-78-6 | 100 | 410 | - |
— osha.gov, retrieved 2026-08-05
What dir.ca.gov says
591786 | S | Methyl n-butyl ketone; 2-hexanone | 1 | 4 | | 10 | 40
— dir.ca.gov, retrieved 2026-08-05
What dir.ca.gov says
591786 | | 2-Hexanone; see Methyl butyl ketone
— dir.ca.gov, retrieved 2026-08-05
Sources
- cdc.govhttps://www.cdc.gov/niosh/npg/npgd0325.html
- osha.govhttps://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1
- dir.ca.govhttps://www.dir.ca.gov/title8/5155.html