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June 08, 2023

Propylene oxide

French name in the regulation: Oxyde de propylène
CAS : 75-56-9
Synonyms: 1,2-Epoxypropane; Oxirane, methyl

Exposure Standards in RROHS regulation

Permissible exposure values (PEV)
ppm mg/m3 f/cc Notes
TWAEV 2 4,8* - -
STEV - - - -
Ceiling - - - -
Simple asphyxiant Percutaneous
Minimum exposure Sensitizer D
Prohibited use Prohibited recirculation
Carcinogenicity C3

TWA adjustment for unusual work schedules

III : Weekly adjustment

CNESST – Toxicological Index Service

Consult REPTOX file: Propylene oxide

Analysis:

Oxyde de propylène

Recommended method by the IRSST:
Method: NIOSH - 1612

Sampling device: Activated charcoal tube 100/50 mg
Parameters:
Flow rate: 0,01-0,2 L/min
TWA sampling volume: 5 L
STEL sampling volume: -
Remarks: This substance is not analyzed by our laboratories. It might be possible that the analysis be performed by another laboratory. Please contact the IRSST before sampling.

Principle: Gas chromatography with flame ionization detection (GC-FID)

NIOSH Manual of Analytical Methods, 4th ed., Method 1612 : Propylene Oxide, 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.