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August 28, 2025

Methyl chloroform

French name in the regulation: Méthylchloroforme

CAS : 71-55-6

Synonyms: Trichloro-1,1,1 éthane

Exposure Standards in RROHS regulation

Permissible exposure values (PEV)

	ppm	mg/m³	f/cc	Notes
TWAEV	350	1910	-	-
STEV	450	2460	-	-
Ceiling	-	-	-	-

Carcinogenicity		Sensitizer
Simple asphyxiant		Percutaneous
Prohibited use		Prohibited recirculation
Minimum exposure		Explosion hazard
Ototoxic

TWA adjustment for unusual work schedules

II : Daily adjustment

CNESST – Toxicological Index Service

Consult REPTOX file: Methyl chloroform

Analysis:

Méthylchloroforme

Method: IRSST - 100-1

Sampling protocol

Sampling device:
Sampling media required:

#IRSST	Description
2120	Activated charcoal tube 100/50 mg

Parameters:
Flow rate: Max: 0,2 L/min
TWA sampling volume: 6 L
STEL sampling volume: 3 L

Analytical protocol

Principle: Gas chromatography with flame ionization detection (GC-FID)
Precision (%): 6,4
Minimum reported value: 450 µg

Reference

IRSST. "Analyse du trichloro 1-1-1 éthane dans l'air". Méthodes analytiques. Montréal: IRSST, 1988.

Methyl chloroform

Method: IRSST - 416

Sampling protocol

Sampling device:
Sampling media required:

#IRSST	Description
2696	566AT passive dosimeter

Parameters:
Flow rate: 0,00793 L/min
TWA sampling volume: -
STEL sampling volume: -
Remarks: For the monitors, the flow must be considered as being a sampling rate.

Analytical protocol

Principle: Gas chromatography with flame ionization detection (GC-FID)
Precision (%): 2,7
Minimum reported value: 80 µg

Reference

IRSST. "Dosage des composés organiques volatils dans l'air par dosimétrie passive". Méthode 416. Non publiée.