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OHS Research
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Loan, Calibration and Repairs
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substance
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substance
September 06, 2025
Chlorodifluoromethane
French name in the regulation:
Chlorodifluorométhane
CAS :
75-45-6
Synonyms:
Fréon 22
Exposure Standards in RROHS regulation
Permissible exposure values (PEV)
ppm
mg/m
3
f/cc
Notes
TWAEV
1000
3540
-
-
STEV
-
-
-
-
Ceiling
-
-
-
-
Carcinogenicity
Sensitizer
Simple asphyxiant
Percutaneous
Prohibited use
Prohibited recirculation
Minimum exposure
Explosion hazard
Ototoxic
TWA adjustment for unusual work schedules
1C
: No adjustment
CNESST – Toxicological Index Service
Consult REPTOX file:
Chlorodifluoromethane
Analysis:
Chlorodifluorométhane (F22)
Method: IRSST - 153-1
Sampling protocol
Sampling device:
Sampling media required:
#IRSST
Description
2121
Activated charcoal 400/200 mg
Parameters:
Flow rate: 0,2 L/min
TWA sampling volume: 5 L
STEL sampling volume: -
Remarks:
Chlorodifluoromethane must be sampled specifically due to the sampling device used. Freon 22. However, simultaneous sampling and analysis of 1,1,2-trichloro-1,2,2-ethane (Freon 113) are possible.
Analytical protocol
Principle:
Gas chromatography with flame ionization detection (GC-FID)
Precision (%):
10,4
Reference
IRSST. "Analyse du chlorodifluorométhane (fréon 22)". Méthode 153-1. Non publiée.
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