SODIUM AZIDE

Chemical Identification
Chemical Identification
CAS # 26628-22-8
Formula

N₃Na

Synonyms

azide; azium; sodium salt of hydrazoic acid

Physical Properties
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
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

The silica gel is coated with a reactive substrate. After collection submit samples to the laboratory using normal shipping procedures as soon as possible. At the lab, refrigerate samples until analysis.

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.

Wipe Method
Wipe Method
Sampler/Sampling media
Bulk Method
Bulk Method
On-Site Screening Techniques
On-Site Screening Techniques
Device
Model/Type
Sampling information
(see manufacturer instructions)
Exposure Limits
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
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 : 01/12/2021