Colorless to white crystalline solid, odorless in water.
In the preparation of hydrazoic acid, lead azide, pure sodium. Fungicide, herbicide.
Registry Numbers and Inventories.
EC Index Number
Very toxic; Contact with acids liberates very toxic gas; Dangerous for the Environment
R 28 32 50/53
S 28 45 60 61
Agricultural Chemical and Pesticide; Tumorigen; Drug; Mutagen; Human Data
Swiss Giftliste 1
Japan ENCS (MITI)
Melting point, °C
Decomposition point, °C
280 - 330
Vapor density (air=1)
9.87 ppm (0.0010%) at 20 C (calculated)
Odor Threshold Odor threshold Odorless
Solubility in water
0.000114/K (30 C)
Hazards and Protection.
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.
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.
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.
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.
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.
Stable under normal shipping and handling conditions. However, may decompose if heated.
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.
Nitrogen oxides, hydrazoic acid.
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.
Moderately flammable. Combustion with moderate heating.
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.
Poisonous gases may be produced when heated.
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
Chronic inhalation and ingestion may cause effects similar to those of acute inhalation and 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.
May be fatal if inhaled. Dust is irritating to the respiratory tract. May cause effects similar to those described for ingestion. Rapidly absorbed.
Causes skin irritation. May be fatal if absorbed through the skin. Substance is rapidly absorbed through the skin.
Causes eye irritation. Contact with dust or vapor may cause systemic toxic effects.
Do NOT induce vomiting. If victim is conscious and alert, give 2-4 cupfuls of milk or water. Get medical aid immediately.
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.
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!
Immediately flush eyes with plenty of water for at least 15 minutes, occasionally lifting the upper and lower eyelids. Get medical aid.
USCG CHRIS Code
2850 00 50
Std. Transport #