Sodium azide

  • Smite
  • Azide
  • Azium
Formula
NaN3
Structure
Description
Colorless to white crystalline solid, odorless in water.
Uses
In the preparation of hydrazoic acid, lead azide, pure sodium. Fungicide, herbicide.

Registry Numbers and Inventories.
CAS
26628-22-8
EC (EINECS/ELINCS)
247-852-1
EC Index Number
011-004-00-7
EC Class
Very toxic; Contact with acids liberates very toxic gas; Dangerous for the Environment
R 28 32 50/53
S 28 45 60 61
RTECS
VY8050000
RTECS class
Agricultural Chemical and Pesticide; Tumorigen; Drug; Mutagen; Human Data
UN (DOT)
1687
Merck
12,8724
Beilstein/Gmelin
11473 (G)
RCRA
P105
EPA OPP
245100
Swiss Giftliste 1
G-2571
Canada DSL/NDSL
DSL
US TSCA
Listed
Austrailia AICS
Listed
New Zealand
Listed
Japan ENCS (MITI)
Listed
Korea ECL
Listed

Properties.
Formula
N3Na
Formula mass
65.01
Melting point, °C
275
Decomposition point, °C
280 - 330
Vapor density (air=1)
2.2
Saturation Concentration
9.87 ppm (0.0010%) at 20 C (calculated)
Odor Threshold Odor threshold Odorless
Density
1.85 g/cm3
Solubility in water
417 g/L
Thermal expansion
0.000114/K (30 C)

Hazards and Protection.
Storage
Store in a cool, dry, well-ventilated area away from incompatible substances. Keep away from water. Do not store in metal containers. Keep containers tightly closed.
Handling
Wash thoroughly after handling. Remove contaminated clothing and wash before reuse. Use only in a well ventilated area. Minimize dust generation and accumulation. Do not get in eyes, on skin, or on clothing. Keep container tightly closed. Do not ingest or inhale.
Protection
Eyes: Wear appropriate protective eyeglasses or chemical safety goggles as described by OSHA's eye and face protection regulations in 29 CFR 1910.133 or European Standard EN166. Skin: Wear appropriate protective gloves to prevent skin exposure. Clothing: Wear appropriate protective clothing to prevent skin exposure.
Respirators
Follow the OSHA respirator regulations found in 29CFR 1910.134 or European Standard EN 149. Always use a NIOSH or European Standard EN 149 approved respirator when necessary.
Small spills/leaks
Vacuum or sweep up material and place into a suitable disposal container. Clean up spills immediately, using the appropriate protective equipment. Avoid generating dusty conditions. Remove all sources of ignition. Provide ventilation.
Disposal code
21
Stability
Stable under normal shipping and handling conditions. However, may decompose if heated.
Incompatibilities
Sodium azide is self-reactive. It will decompose at 275C. Incompatible with benzoyl chloride, potassium hydroxide, bromine, carbon disulfide, chromyl chloride, copper, dibromomalononitrile, dimethyl sulfate, lead, nitric acid, silver, mercury. Reacts with lead, silver, mercury to form shock sensitive and explosive metal azides.
Decomposition
Nitrogen oxides, hydrazoic acid.

Fire.
Flash Point,°C
300
Fire fighting
Wear a self-contained breathing apparatus in pressure-demand, MSHA/NIOSH (approved or equivalent), and full protective gear. Use water spray to keep fire-exposed containers cool. Will react with water to form toxic and corrosive fumes. Contact with metals may evolve flammable hydrogen gas. Containers may explode when heated. Combustible material; may burn but does not ignite readily. Extinguishing media: Do NOT get water inside containers. For small fires, use dry chemical, carbon dioxide, or water spray. For large fires, use dry chemical, carbon dioxide, alcohol-resistant foam, or water spray. Cool containers with flooding quantities of water until well after fire is out.
Fire potential
Moderately flammable. Combustion with moderate heating.
Hazards
When heated to decomposition, it emits very toxic fumes of nitrogen oxides; explosive. Forms explosive-sensitive materials with some metals such as lead, silver, mercury or copper. May form toxic hydrazoic acid fumes in fire. Containers may explode in fire. Avoid acids, benzoyl chloride and potassium hydroxide; bromine; carbon disulfide; copper; lead; nitric acid; barium carbonate; sulfuric acid; chromium (II) hypochlorite, dimethyl sulfate, water, dibromomalononitrile, lead, silver, copper, mercury.
Combustion products
Poisonous gases may be produced when heated.
Health
4
 
Flammability
0
 
 
Reactivity
1
 

Health.
Exposure limit(s)
TLV (as (ceiling values)): 0.11 ppm as hydrazoic acid vapor ppm; 0.29 mg/m3 as sodium azide (ACGIH 1996). NIOSH REL: C 0.1 ppm (as HN3) skin C 0.3 mg/m3 (as NaN3) skin
Poison_Class
2
Exposure effects
Chronic inhalation and ingestion may cause effects similar to those of acute inhalation and ingestion.
   Ingestion
May be fatal if swallowed. Causes gastrointestinal irritation with nausea, vomiting and diarrhea. This chemical is rapidly absorbed from the gastrointestinal tract. Exposure may cause a rapid fall in blood pressure, weakness, headache, collapse and death. Solutions of sodium azide release hydrazoic acid vapor, which is highly toxic.
   Inhalation
May be fatal if inhaled. Dust is irritating to the respiratory tract. May cause effects similar to those described for ingestion. Rapidly absorbed.
   Skin
Causes skin irritation. May be fatal if absorbed through the skin. Substance is rapidly absorbed through the skin.
   Eyes
Causes eye irritation. Contact with dust or vapor may cause systemic toxic effects.

First aid
 
   Ingestion
Do NOT induce vomiting. If victim is conscious and alert, give 2-4 cupfuls of milk or water. Get medical aid immediately.
   Inhalation
Remove from exposure to fresh air immediately. If not breathing, give artificial respiration. If breathing is difficult, give oxygen. Get medical aid. DO NOT use mouth-to-mouth respiration.
   Skin
Get medical aid. Immediately flush skin with plenty of soap and water for at least 15 minutes while removing contaminated clothing and shoes. Remove contaminated clothing and shoes. SPEEDY ACTION IS CRITICAL!
   Eyes
Immediately flush eyes with plenty of water for at least 15 minutes, occasionally lifting the upper and lower eyelids. Get medical aid.

Transport.
UN number
1687
Response guide
Hazard class
6.1
Packing Group
II
 
USCG CHRIS Code
SAZ
 
HS Code
2850 00 50
 
Std. Transport #
4923465