IRSST - Institut de recherche Robert-Sauvé en santé et en sécurité du travail

1,2 Dichloro-1,1,2,2-tetrafluoroethane

French name in the regulation: Dichloro-1,2 tétrafluoro-1,1,2,2 éthane
CAS : 76-14-2
Synonyms: Halocarbon 114

Exposure Standards in RROHS regulation

Permissible exposure values (PEV)
ppm mg/m3 f/cc Notes
TWAEV 1000 6990 - -
STEV - - - -
Ceiling - - - -
Simple asphyxiant Percutaneous
Minimum exposure Sensitizer
Prohibited use Prohibited recirculation

TWA adjustment for unusual work schedules

1C : No adjustment

CNESST – Toxicological Index Service


Dichloro-1,2 tétrafluoro-1,1,2,2 éthane

Recommended method by the IRSST:
Method: NIOSH - 1018
Sampling device: Two 400/200 mg and 100/50 mg activated charcoal tubes in series.
Flow rate: 0,01-0,05 L/min
TWA sampling volume: 4 L
STEL sampling volume: -
Remarks: Contact the IRSST before sampling. Freon 114.
Principle: Gas chromatography with flame ionization detection (GC-FID)
NIOSH Manual of Analytical Methods, 4th ed., Method 1018 : Dichlorodifluoromethane, 1994.
Following the amendment of Appendix 1 of the Quebec Regulation respecting occupational health and safety (RSST, RLRQ, c. S-2.1, r. 13), part of Quebec Occupational Health and Safety Act, which came into effect on March 26, 2020, the TWAEV, STEL and Ceiling values for certain substances are now expressed in ppm. For these substances, the IRSST performed the conversion calculations to express these TWAEV, TWA and Ceiling values in mg/m3, which thus appears in its Sampling Guide for Air Contaminants in the Workplace (Guide d'échantillonnage des contaminants de l'air en milieu de travail ) and the associated Substance Data Sheets. However, it is imperative to refer to the values expressed in the RSST which are legally binding.