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OHS Research
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control program
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substance
September 16, 2025
Sodium azide, Hydrazoic acid vapour
French name in the regulation:
Sodium, azoture de, En vapeur d'acide hydrazoïque
CAS :
26628-22-8
Exposure Standards in RROHS regulation
Permissible exposure values (PEV)
ppm
mg/m
3
f/cc
Notes
TWAEV
-
-
-
-
STEV
-
-
-
-
Ceiling
0,11
-
-
-
Carcinogenicity
Sensitizer
Simple asphyxiant
Percutaneous
Prohibited use
Prohibited recirculation
Minimum exposure
Explosion hazard
Ototoxic
TWA adjustment for unusual work schedules
Undetermined
CNESST – Toxicological Index Service
Consult REPTOX file:
Sodium azide, Hydrazoic acid vapour
Analysis:
Sodium azide, as Hydrazoic acid vapour
Recommended method by the IRSST:
Method: -
Sampling protocol
Sampling device:
Parameters:
Flow rate: -
TWA sampling volume: -
STEL sampling volume: -
Analytical protocol
Remarks:
OSHA method ID211 is for the simultaneous determination of sodium azide (NaN3) and hydrazoic acid (HN3) since sodium azide is converted into hydrazoic acid when in contact with moisture. Individual results for HN3 vapor and NaN3 particle are not provided, only the sum of the two. The result is expressed as Sodium azide. See Sodium azide (as Sodium azide) for more information.
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