HYDRAZOIC ACID
| Chemical Identification | |
|---|---|
| CAS # | 7782-79-8 |
| Formula |
HN₃ |
| Synonyms |
azoimide; diazoimide; hydrogen azide; hydronitric acid; triazoic acid |
| Physical Properties | |||
|---|---|---|---|
| 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 | ||||||
|---|---|---|---|---|---|---|
| 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 | ||||||
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Sampling information (see manufacturer instructions) |
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| 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 |
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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