Ammonium nitrate

  • Nitric acid, ammonium salt
Formula
NH4NO3
Structure
Description
White crystals, odorless, hygroscopic, deliquescent.
Uses
In freezing mixtures, manufacture of matches & pyrotechnics.

Registry Numbers and Inventories.
CAS
6484-52-2
EC (EINECS/ELINCS)
229-347-8
EC Class
oxidizing
R 8 36/37/38
S 17 26 37/39
RTECS
BR9050000
RTECS class
Other
UN (DOT)
1942
Merck
12,567
Beilstein/Gmelin
20944 (G)
EPA OPP
76101
Swiss Giftliste 1
G-5311
Canada DSL/NDSL
DSL
US TSCA
Listed
Austrailia AICS
Listed
New Zealand
Listed
Japan ENCS (MITI)
Listed
Korea ECL
Listed

Properties.
Formula
H4N2O3
Formula mass
80.04
Melting point, °C
169
Boiling point, °C
230
Sublimation point, °C
190 - 200
Decomposition point, °C
210
Vapor pressure, mmHg
0.003 (79 C)
Density
1.73 g/cm3
Solubility in water
675 g/L (25 C)
Surface tension
103.8 erg/cm2 (100 C)
Refractive index
14198 (60 C)
Thermal expansion
0.000982/K (20 C)
Heat of fusion
5.9 kJ/mol

Hazards and Protection.
Storage
Keep away from sources of ignition. Do not store near combustible materials. Store in a tightly closed container. Store in a cool, dry, well-ventilated area away from incompatible substances. Keep away from acids. Keep away from reducing agents. Do not store near alkaline substances.
C D2B
Handling
Use with adequate ventilation. Minimize dust generation and accumulation. Avoid contact with eyes, skin, and clothing. Empty containers retain product residue, (liquid and/or vapor), and can be dangerous. Keep container tightly closed. Avoid contact with heat, sparks and flame. Avoid contact with clothing and other combustible materials. Avoid ingestion and inhalation. Keep away from clothing and other combustible materials. Do not pressurize, cut, weld, braze, solder, drill, grind, or expose empty containers to heat, sparks or open flames.
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 gloves to prevent skin exposure. Clothing: Wear appropriate protective clothing to minimize contact with skin.
Respirators
A particulate respirator (NIOSH type N95 or better filters) may be worn. If oil particles (e.g. lubricants, cutting fluids, glycerine, etc.) are present, use a NIOSH type R or P filter. For emergencies or instances where the exposure levels are not known, use a full-face positive-pressure, air-supplied respirator.
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.
Stability
Stable at room temperature in closed containers under normal storage and handling conditions. Risk of explosion if heated under confinement. Deliquescent (tending to absorb atmospheric water vapor and become liquid).
Incompatibilities
Aluminum, antimony, chromium, copper, iron, lead, magnesium, manganese, nickel, zinc, brass, oil, charcoal, organic material, acetic acid, ammonium chloride, bismuth, cadmium, chlorides, cobalt, phosphorus, potassium and ammonium sulfate, sodium, sodium hypochlorite, sodium perchlorate, sodium-potassium alloy, and sulfure.
Decomposition
Emits nitrous oxides when heated to decomposition. Liberates ammonia in reaction with strong alkalis.

Fire.
Fire fighting
Dangerously explosive. Do not fight fires in a cargo of explosives. Evacuate area and let burn.
Fire potential
Slightly flammable. Oxidizing, supports combustion.
Hazards
MAY EXPLODE AND THROW FRAGMENTS 1600 meters (1 MILE) OR MORE IF FIRE REACHES CARGO.
Combustion products
Decomposes, giving off extremely toxic oxides of nitrogen.
Health
0
 
Flammability
0
 
 
Reactivity
3
 
 
Special
O

Health.
Poison_Class
4
Exposure effects
Small repeated oral doses of nitrates may cause weakness, depression, headache, and mental impairment.
   Ingestion
Large oral doses of nitrates may cause dizziness, abdominal pain, vomiting, bloody diarrhea, weakness, convulsions, and collapse. Harmful if swallowed. May cause methemoglobinemia resulting in cyanosis.
   Inhalation
May cause irritation to the respiratory tract; symptoms may include coughing, sore throat, and shortness of breath. At high temperatures, exposure to toxic nitrogen oxides decomposition products can quickly cause acute respiratory problems. Inhalation of large amounts causes systemic acidosis and abnormal hemoglobin.
   Skin
Causes irritation to skin. Symptoms include redness, itching, and pain.
   Eyes
Causes irritation, redness, and pain.

First aid
 
   Ingestion
If swallowed, DO NOT INDUCE VOMITING. Give large quantities of water. Never give anything by mouth to an unconscious person. Get medical attention immediately.
   Inhalation
Remove from exposure to fresh air immediately. If not breathing, give artificial respiration. If breathing is difficult, give oxygen. Get medical aid.
   Skin
Get medical aid. Flush skin with plenty of soap and water for at least 15 minutes while removing contaminated clothing and shoes.
   Eyes
Flush eyes with plenty of water for at least 15 minutes, occasionally lifting the upper and lower eyelids. Get medical aid.

Transport.
UN number
1942
Response guide
Hazard class
5.1
Packing Group
III
 
USCG CHRIS Code
AMN
 
HS Code
3102 30 90
 
Std. Transport #
4901546
 
IMO Chemical Code
#
IMO Pollution Category
D
IMO Hazard code
S