HYDRAZOIC ACID
Chemical Identification | |
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CAS # | 7782-79-8 |
Formula |
HN₃ |
Synonyms |
azoimide; diazoimide; hydrogen azide; hydronitric acid; triazoic acid |
Physical Properties | |||
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Physical description | Colorless liquid with an intolerable pungent odor. | ||
Boiling point | 96.26°F | Molecular weight | 43.03 |
Freezing point/melting point | -112°F | Vapor pressure | 484 mmHg |
Flash point | Vapor density | ||
Specific gravity | 1.09 | Ionization potential | |
Lower explosive limit (LEL) | Upper explosive limit (UEL) | ||
NFPA health rating | NFPA fire rating | ||
NFPA reactivity rating | NFPA special instruction | ||
Vapor hazard ratio (VHR) | |||
Historical exceedance percentage | |||
Target organs |
Monitoring Methods Used by OSHA | ||||||
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Analyte code (IMIS no.) | 2243 | |||||
Sampling group | ||||||
Sampler/Sampling media | 37 mm PVC filter and Silica gel tube(150/75 mg) impregnated with NaOH, A Preweighted PVC Gravimetric Filter is used to collect particulate azide [SKC 226-55 & SLTC108] | |||||
Sampling time* | 5 minute minimum |
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Sampling volume (TWA)* |
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Sampling flow rate (TWA)* |
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Sampling volume (STEL/Peak/C)* | 5 L (minimum) |
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Sampling flow rate (STEL/Peak/C)* | 1 L/min |
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Analytical method instruments | ||||||
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. |
Exposure limit for NAIMA is 1.0 f/cc |
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Special requirements |
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* 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 | |
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Sampler/Sampling media |
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Bulk Method |
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On-Site Screening Techniques | ||||||
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Device | ||||||
Model/Type | ||||||
Sampling information (see manufacturer instructions) |
Exposure Limits | |||||||
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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 |
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PEL-TWA |
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REL-TWA |
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TLV-TWA |
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PEL-TWA |
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PEL-STEL |
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REL-STEL |
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TLV-STEL |
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PEL-STEL |
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PEL-C |
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REL-C |
0.1 ppm |
TLV-C |
0.11 ppm [1992] |
PEL-C |
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Skin notation |
NA |
Skin notation |
Y |
Skin notation |
N |
Skin notation |
NA |
Notes:
Not established |
Notes:
as (HN₃) |
Notes:
as Hydrazoic acid vapor |
Notes:
Not established |
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Health factors: See NIH-NLM PubChem. | IDLH | ||||||
Carcinogenic classifications: |
Notes:
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AIHA emergency response planning guidelines - ERPG-1/ERPG-2/ERPG-3:
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Additional Resources and Literature References |
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NOAA: CAMEO Chemicals - Sodium azide NIOSH: Pocket Guide to Chemical Hazards - Sodium azide Literature References
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Last Updated Date : 09/22/2022