---
type: threshold
id: methyl-chloroform-1-1-1-trichloroethane
asset: workplace-exposure-limits
title: "Methyl chloroform (1,1,1-Trichloroethane) — US workplace chemical exposure limits: federal OSHA vs Cal/OSHA, side by side"
sources:
  - https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1
source_quote: "Methyl chloroform (1,1,1-Trichloroethane) | 71-55-6 | 350 | 1900 | - |"
generated: true
harvested: 2026-08-05
stale_after: 2027-08-05
substance: "Methyl chloroform (1,1,1-Trichloroethane)"
cas_number: "71-55-6"
pel_ppm: "350"
pel_mgm3: "1900"
verified: true
---
**Substance:** Methyl chloroform (1,1,1-Trichloroethane)

**CAS No.:** 71-55-6

**PEL (ppm):** 350

**PEL (mg/m³):** 1900

> Methyl chloroform (1,1,1-Trichloroethane) | 71-55-6 | 350 | 1900 | - |

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