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OHS Research
Research at the IRSST
Reference Framework
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Publications and Tools
IRSST's Production
Magazine and Newsletter
Scientific Watch
Documentation Center
Useful Links
Laboratory Services
Laboratories
Analysis and Testing Services
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Masks Efficacy Evaluation
Workplace Air Contaminants
Slip Resistance Test for Protective Footwear
Loan, Calibration and Repairs
Recognition Programs
CQ Fibres
Quality Control of Fiber Counts
CQ Vrac
Recognized Laboratories
Interlaboratory quality
control program
Guides and Tools
Instruments and Sampling Material
Register
Research Fund and Partnerships
Research Fund and Partnerships
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Scholarships
Master’s Scholarship and Supplement
Doctoral Scholarship and Supplement
Postdoctoral Fellowship
Research partnerships
Institute
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substance
August 28, 2025
Dichlorodifluoromethane
French name in the regulation:
Dichlorodifluorométhane
CAS :
75-71-8
Synonyms:
Fréon 12
Exposure Standards in RROHS regulation
Permissible exposure values (PEV)
ppm
mg/m
3
f/cc
Notes
TWAEV
1000
4950
-
-
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:
Dichlorodifluoromethane
Analysis:
Dichlorodifluorométhane
Recommended method by the IRSST:
Method: NIOSH - 1018
Sampling protocol
Sampling device:
Two 400/200 mg et 100/50 mg activated charcoal tubes in series.
Parameters:
Flow rate: 0,01-0,05 L/min
TWA sampling volume: 4 L
STEL sampling volume: -
Remarks:
Contact the IRSST before sampling. Freon 12.
Analytical protocol
Principle:
Gas chromatography with flame ionization detection (GC-FID)
Reference
NIOSH Manual of Analytical Methods, 4th ed., Method 1018 : Dichlorodifluoromethane, 1994.
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