# 2-Hexanone (Methyl n-butyl ketone) — US workplace chemical exposure limits: federal OSHA vs Cal/OSHA, side by side

For 2-Hexanone (Methyl n-butyl ketone), cas no. is 591-78-6; pel (ppm) is 100; pel (mg/m³) is 410, verified against its source on 2026-08-05.

- **Substance:** 2-Hexanone (Methyl n-butyl ketone)
- **CAS No.:** 591-78-6
- **PEL (ppm):** 100
- **PEL (mg/m³):** 410

## What the source says

> 2-Hexanone (Methyl n-butyl ketone) | 591-78-6 | 100 | 410 | - |

## Source

- https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1

Last verified: 2026-08-05. Review by: 2027-08-05.
Part of [US workplace chemical exposure limits: federal OSHA vs Cal/OSHA, side by side](https://referencesource.org/workplace-exposure-limits/).