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IRSST - Institut de recherche Robert-Sauvé en santé et en sécurité du travail
OHS Research
Research at the IRSST
Reference Framework
Scientists Directory
Publications and Tools
IRSST's Production
Magazine and Newsletter
Scientific Watch
Documentation Center
Useful Links
Laboratory Services
Laboratories
Analysis and Testing Services
Laboratory Methods
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
Grants
Scholarships
Master’s Scholarship and Supplement
Doctoral Scholarship and Supplement
Postdoctoral Fellowship
Research partnerships
Institute
About
Activity Report
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substance
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substance
September 04, 2025
1,1-Dimethylhydrazine
French name in the regulation:
Diméthyl-1,1 hydrazine
CAS :
57-14-7
Exposure Standards in RROHS regulation
Permissible exposure values (PEV)
ppm
mg/m
3
f/cc
Notes
TWAEV
0,01
0,025
*
-
-
STEV
-
-
-
-
Ceiling
-
-
-
-
Carcinogenicity
C3
Sensitizer
Simple asphyxiant
Percutaneous
Prohibited use
Prohibited recirculation
Minimum exposure
Explosion hazard
Ototoxic
TWA adjustment for unusual work schedules
III
: Weekly adjustment
CNESST – Toxicological Index Service
Consult REPTOX file:
1,1-Dimethylhydrazine
Analysis:
Diméthyl-1,1 hydrazine
Recommended method by the IRSST:
Method: NIOSH - 3515
Sampling protocol
Sampling device:
Glass fritted tip impinger containing 15 mL of 0.1 N hydrochloric acid
Parameters:
Flow rate: 0,2-1 L/min
TWA sampling volume: 100 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.
Analytical protocol
Principle:
Ultraviolet and visible spectrophotometry (UV/VIS-S)
Remarks:
Some compounds may cause interference during the analysis.
Reference
NIOSH Manual of Analytical Methods. 4th ed. Method 3515 : 1,1-Dimethylhydrazine, 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/m
3
, 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.
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