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


French name in the regulation: Éthylène
CAS : 74-85-1
Synonyms: Acetene; Olefiant Gas

Exposure Standards in RROHS regulation

Permissible exposure values (PEV)
ppm mg/m3 f/cc Notes
TWAEV 200 230* - -
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

Consult REPTOX file: Ethylene



Method: IRSST - 9-C
Sampling device:
Flow rate: -
TWA sampling volume: -
STEL sampling volume: -
Principle: Combustible gas detector (DRI-EX)
Remarks: A DRI can be used for measuring combustible gases according to the percentage of their lower explosive limit. In the paper version of the guide, refer to the note about simple asphyxiants. The reference method corresponds to calibration of the direct-reading instrument (DRI).
IRSST. "Étalonnage d'un instrument à lecture direct pour l'analyse des gaz combustibles dans l'air". Méthode 9-C. Méthodes d'étalonnage. Montréal: IRSST, 1997.
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.