SODIUM AZIDE

Chemical Identification
CAS #	26628-22-8
Formula	N₃Na
Synonyms	azide; azium; sodium salt of hydrazoic acid

Physical Properties
Physical description	Colorless to white, odorless, crystalline solid.
Boiling point	decomposes	Molecular weight	65.02
Freezing point/melting point	527°F (decomposes to sodium and nitrogen)	Vapor pressure
Flash point		Vapor density
Specific gravity	1.85	Ionization potential	11.70 eV
Lower explosive limit (LEL)		Upper explosive limit (UEL)
NFPA health rating	4	NFPA fire rating	1
NFPA reactivity rating	3	NFPA special instruction
Vapor hazard ratio (VHR)
Historical exceedance percentage
Target organs

Monitoring Methods Used by OSHA
Analyte code (IMIS no.)	S113
Sampling group
Sampler/Sampling media	Silica gel tube(150/75 mg) impregnated with NaOH, a pre-filter is used to collect particulate azide [SKC 226-55 & SKC 225-802]
Sampling time^*	5 min minimum
Sampling volume (TWA)^*	5 L minimum
Sampling flow rate (TWA)^*	1 L/min
Sampling volume (STEL/Peak/C)^*
Sampling flow rate (STEL/Peak/C)^*
Analytical method instruments	IC
Method reference	OSHA ID-211 (fully validated)
Notes	Keep samples refrigerated when not in transit. Ship samples overnight with cold-packs as soon as possible.
Special requirements

^* All sampling instructions above are recommended guidelines for OSHA Compliance Safety and Health Officers (CSHOs), please see the corresponding OSHA method reference for complete details.

Bulk/Wipe Method
Wipe Sampler/Sampling media
Bulk Method

On-Site Screening Techniques
Device
Model/Type
Sampling information (see manufacturer instructions)

**Exposure Limits**
OSHA PEL 8-hour TWA (ST) STEL (C) Ceiling Peak		NIOSH REL Up to 10-hour TWA (ST) STEL (C) Ceiling		ACGIH TLV© 8-hour TWA (ST) STEL (C) Ceiling		CAL/OSHA PEL 8-hour TWA (ST) STEL (C) Ceiling Peak
PEL-TWA		REL-TWA		TLV-TWA		PEL-TWA
PEL-STEL		REL-STEL		TLV-STEL		PEL-STEL
PEL-C		REL-C	0.1 ppm (0.3 mg/m³) (as HN3), 0.3 mg/m³ (as NaN3)	TLV-C	0.29 mg/m³ (as Sodium azide), 0.11 ppm (as Hydrazoic acid vapor) [1992]	PEL-C	0.1 ppm (0.3 mg/m³)
Skin notation	NA	Skin notation	Y	Skin notation	N	Skin notation	Y
Notes: Not established		Notes:		Notes:		Notes:
Health factors: See NIH-NLM PubChem.		IDLH
Carcinogenic classifications: TLV-A4		Notes:
AIHA emergency response planning guidelines - ERPG-1/ERPG-2/ERPG-3:

Additional Resources and Literature References

NOAA: CAMEO Chemicals - Sodium azide

NIOSH: Pocket Guide to Chemical Hazards - Sodium azide

Literature References

ACGIH: Documentation of the Threshold Limit Values (TLVs) and Biological Exposure Indices (BEIs) - Sodium azide. See annual publication for most recent information.
Chang, S. and Lamm, S.H.: Human health effects of sodium azide exposure: a literature review and analysis. Int. J. Toxicol. 22(3): 175-186, 2003.
Miljours, S. and Braun, C.M.J.: A neuropsychotoxicological assessment of workers in a sodium azide production plant. Int. Arch. Occup. Environ. Health 76(3): 225-232, 2003.
Pohanish, R.P. (editor): Sodium Azide. In, Sittig's Handbook of Toxic and Hazardous Chemicals and Carcinogens, Fourth Ed., Vol. 2. Norwich, NY: Noyes Publications, William Andrew Publishing, 2002, pp. 2055-2057.
Shahidullah, M., et al.: Role of catalase in the smooth muscle relaxant actions of sodium azide and cyanamide. Eur. J. Pharmacol. 435(1): 93-101, 2002.
Trout, D., Esswein, E.J., Hales, T., Brown, K., Solomon, G. and Miller, M.: Exposures and health effects: an evaluation of workers at a sodium azide production plant. Am. J. Ind. Med. 30(3): 343-350, 1996.
Weiss, J.S.: Reactive airway dysfunction syndrome due to sodium azide inhalation. Int. Arch. Occup. Environ. Health 68(6): 469-471, 1996.

Last Updated Date : 09/22/2022

SODIUM AZIDE

Chemical Identification

Physical Properties

Monitoring Methods Used by OSHA

Bulk/Wipe Method

On-Site Screening Techniques

Exposure Limits

Additional Resources and Literature References