Methyl chloroform — CAS 71-55-6 — workplace exposure limit

What is the niosh rel (ppm) for Methyl chloroform — CAS 71-55-6 — workplace exposure limit?

For Methyl chloroform, niosh rel (ppm) is C 350; niosh rel (mg/m³) is 1900; cas no. is 71-55-6, verified against its source on 2026-09-08.

NIOSH REL C 350 ppm (1900 mg/m3) [15-minute]

— cdc.gov, retrieved 2026-09-08

Substance: Methyl chloroform verified
CAS No.: 71-55-6 verified
NIOSH REL (ppm): C 350 verified
NIOSH REL (mg/m³): 1900 verified
PEL (ppm): 350 per osha.gov
PEL (mg/m³): 1900 per osha.gov
Ceiling: 800 ppm per dir.ca.gov
Ceiling notation: a ceiling value in addition to the TWA values per dir.ca.gov
STEL (ppm): 450 per dir.ca.gov
STEL (mg/m³): 2450 per dir.ca.gov

Verified2026-09-08

Review by2027-08-05

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 - Methyl chloroform

CAS No.

CAS No. 71-55-6

— all from cdc.gov, retrieved 2026-09-08

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

— osha.gov, retrieved 2026-08-05

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

— dir.ca.gov, retrieved 2026-09-28

71556 | | 1,1,1-Trichloroethane; see Methyl chloroform

— dir.ca.gov, retrieved 2026-08-05

cdc.govhttps://www.cdc.gov/niosh/npg/npgd0404.html
osha.govhttps://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1
dir.ca.govhttps://www.dir.ca.gov/title8/5155.html

Last verified against source: 2026-09-08. Due for re-check by 2027-08-05. This page as Markdown · OKF bundle · full dataset as JSON.