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


French name in the regulation: Hydrazine
CAS : 302-01-2
Synonyms: Diamine; Diamide

Exposure Standards in RROHS regulation

Permissible exposure values (PEV)
ppm mg/m3 f/cc Notes
TWAEV 0,1 0,13 - -
STEV - - - -
Ceiling - - - -
Simple asphyxiant Percutaneous
Minimum exposure  Sensitizer
Prohibited use Prohibited recirculation
Carcinogenicity C2

TWA adjustment for unusual work schedules

III : Weekly adjustment

CNESST – Toxicological Index Service

Consult REPTOX file: Hydrazine



Recommended method by the IRSST:
Method: OSHA - 108
Sampling device: Treated glass fiber filter
Flow rate: 1 L/min
TWA sampling volume: 240 L
STEL sampling volume: -
Principle: High performance liquid chromatography with UV detection (HPLC-UV)
OSHA Analytical Methods Manual, Method 108: Hydrazine, 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.