# Methyl chloroform; 1,1,1-trichloroethane — US workplace chemical exposure limits: federal OSHA vs Cal/OSHA, side by side

For Methyl chloroform; 1,1,1-trichloroethane, pel (ppm) is 350; pel (mg/m³) is 1900; ceiling is 800 ppm; stel (ppm) is 450; stel (mg/m³) is 2450, verified against its source on 2026-08-05.

- **Substance:** Methyl chloroform; 1,1,1-trichloroethane
- **PEL (ppm):** 350
- **PEL (mg/m³):** 1900
- **Ceiling:** 800 ppm
- **STEL (ppm):** 450
- **STEL (mg/m³):** 2450

## What the source says

> 71556 | | Methyl chloroform; 1,1,1-trichloroethane | 350 | 1900 | 800 ppm | 450 | 2450

## Source

- https://www.dir.ca.gov/title8/5155.html

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/).