TRADE NAME:

Urea - Ammonium Nitrate Solution

SYNONYMS:

UAN 32%, Non-Pressure Nitrogen Fertilizer Solution, 32% Nitrogen Solution, 32-0-0

CHEMICAL FAMILY:

Aqueous inorganic salt solution

CHEMICAL ID NO:

None

CHEMICAL FORMULAS:

Urea, CO(NH₂)₂ and Ammonium Nitrate, NH₄NO₃

DOT HAZARD CLASS:

None

LABEL REQUIRED:

None

Urea - Ammonium Nitrate Solution: Composition‹

INGREDIENTS

CAS
NUMBER

Wt%

OSHA
PEL¹

^<2

NIOSH
IDLH³

UNITS

UREA

0057-13-6

34.0-37.0

N.A.

N.A.

N.A.

N.A.

AMMONIUM
NITRATE

6484-52-2

42.0-44.5

N.A.

N.A.

N.A.

N.A.

WATER

7732-18-5

17.0-24.0

N.A.

N.A.

N.A.

N.A.

1 = Permissible Exposure Limit (8-Hr. Time Weighted Average).

2 = Short Term Exposure Limit (15 Minute Exposure).

3 = Immediately Dangerous to Life and Health.

N.A. = Not Available

Urea - Ammonium Nitrate Solution: NFPA Code

1

HEALTH HAZARD (Blue):
Can cause irritation if not treated.

0

FLAMMABILITY HAZARD (Red):
Will not burn.

REACTIVITY HAZARD (Yellow):
Normally stable. Not reactive with water.

NONE

SPECIAL NOTICE (White):
None

Urea - Ammonium Nitrate Solution:
Physical and Chemical Properties

BOILING POINT:

212°F @ 1 atmosphere

DECOMPOSITION
TEMPERATURE:

237°F

CRYSTALLIZATION
TEMPERATURE:

32°F (minimum)

SOLUBILITY IN H20:

<118g/100g @ 32°F

WEIGHT:

10.8 - 11.1 lb/gal @ 60°F

pH:

5.5-7.5

ODOR:

Slight Ammonia Odor

APPEARANCE:

Clear liquid

Urea - Ammonium Nitrate Solution: Fire and Explosion Data

FLASH POINT:

N.A.

FLAMMABLE LIMIT
in AIR %/VOL:

Lower: N.A., Upper: N.A.

AUTOIGNITION
TEMPERATURE:

N.A.

EXTINGUISHING
MEDIA:

N.A. (Not Available)

SPECIAL
FIRE FIGHTING
PROCEDURE:

Firefighters should wear self-contained breathing apparatus and full protective clothing.

UNUSUAL FIRE OR
EXPLOSION DATA:

Aqueous solutions of Urea- Ammonium Nitrate will not burn or support combustion, but will decompose into noxious, poisonous gases when exposed to the high temperatures of a fire. The solutions may become explosive if combined with a flammable substance and/or dried to a low percentage of water.

Urea - Ammonium Nitrate Solution: Reactivity Data

STABILITY:

Stable unless heated to decomposition.

HAZARDOUS
POLYMERIZATION:

Will not occur.

CONDITIONS TO
AVOID/
INCOMPATIBILITY

Concentrated acids, strong bases, and heat.

HAZARDOUS
DECOMPOSITION
PRODUCTS:

Ammonia, oxidized further to Nitric Oxide, Nitrogen Dioxide.

Urea - Ammonium Nitrate Solution: Health Hazard Data

CARCINOGENICITY

NTP:

IARC MONOGRAPHS:

OSHA REGULATED:

NO

NO

NO

OCCUPATIONAL
EXPOSURE LIMITS:

OSHA PERMISSIBLE
EXPOSURE LIMIT (PEL):

None established for Urea - Ammonium Nitrate.

ACGIH SHORT-TERM
EXPOSURE LIMIT (STEL):

None established for Urea - Ammonium Nitrate

NIOSH IMMEDIATELY DANGEROUS TO LIFE AND HEALTH (IDLH):

None established for Urea - Ammonium Nitrate.

EFFECTS OF
OVEREXPOSURE:

ACUTE:

EYES:

Dried salts or liquid may cause redness, pain and irritation to eye.

SKIN:

Dried salts or liquid may irritate skin resulting in reddening of the skin and possible dermatitis. Frequent or prolonged contact may promote an allergic reaction.

INHALATION:

Dried salts may be irritating to mucous membranes, respiratory tract, causing sore throat, coughing, difficult breathing and severe lung congestion. Delayed reactions may result in pulmonary edema and chemical pneumonitis.

INGESTION:

Dried salts or liquid may cause gastric irritation, nausea, abdominal spasms, vomiting and faintness. Large doses may cause systemic acidosis and methemoglobinemia.

EFFECTS OF
OVER EXPOSURE:

CHRONIC:

None known for Ammonium Nitrate. None known for Urea.

ADDITIONAL MEDICAL AND
TOXICOLOGICAL INFORMATION:

Dried salt may aggravate preexisting dermatitis and lung conditions.

Urea - Ammonium Nitrate Solution: Emergency First Aid Procedures

EYE CONTACT:

Immediately flush with large amounts of water, including under the eyelids. If discomfort persists contact a physician, preferably an Ophthalmologist. Speed and thoroughness in rinsing eyes are important to avoid permanent injury.

SKIN CONTACT:

Immediately remove contaminated clothing and shoes. Wash the affected area with soap and flush with large amounts of water. Get medical attention if discomfort persists.

INHALATION:

Remove to fresh air. If breathing has stopped, apply artificial respiration. Keep warm and at rest. Get immediate medical attention.

INGESTION:

Do not induce vomiting. If vomiting occurs, keep head below hips to help prevent aspiration. Get immediate medical attention. Treat for methemoglobinemia.

Urea - Ammonium Nitrate Solution: Suggested Protection

EYE PROTECTION:

UAN 32% is an aqueous salt solution and will dissolve with mucosal membrane contact (eyes). Remove contact lenses and wear safety glasses, chemical goggles or face shield where contact with liquid or dried salt may occur.

SKIN PROTECTION:

UAN 32% is an aqueous salt solution and will dissolve with perspiration contact. Wearing of appropriate protective clothing and gloves is suggested if epidermal sensitivity develops.

INHALATION:

Dried salt or aerosol solution will dissolve with mucosal membrane contact (lungs). Use approved respiratory protective equipment for cleaning large spills or upon entry into large tanks, vessels, and other designated confined space areas or in any situations where airborne concentrations may exceed occupational exposure limits. (15 mg/m3, dust)

VENTILATION:

Provide adequate general and local exhaust ventilation to attain occupational exposure limits, particularly in a confined space area.

Urea - Ammonium Nitrate Solution: Spill or Leak

SPILL PROCEDURES:

Remove sources of heat or ignition. Clean-up spill but do not flush to surface water. Contaminated soil can be spread as if it were fertilizer.

Consult DOT "Emergency Response Guidebook" - Guide 31.

Urea - Ammonium Nitrate Solution: Waste Disposal

PROCEDURE:

Dispose of through a licensed waste disposal company. Follow federal, state and local regulations.

Urea - Ammonium Nitrate Solution: Special Precautions and Comments

STORAGE PRECAUTIONS:

Store away from incompatible materials or sources of heat and ignition. Empty containers may contain residue and can be dangerous. Do not pressurize, cut, weld, braze, solder, drill, grind or expose such containers to heat, flames, sparks or other sources of ignition; they may evolve poisonous gas and cause injury or death.

COMMENT:

Never heat a dried UAN solution, especially when confined.
Never combine with Nitric Acid.

Urea - Ammonium Nitrate Solution: EPA SARA Title III Information

SECTION 311/312 HAZARD CATEGORIZATION:

ACUTE

CHRONIC

FIRE

PRESSURE

REACTIVE

X

INGREDIENT

CAS NO.

% / wt.

SEC. 313

Sec. 302

RQ lb.

TPQ lb.

Ammonium Nitrate (Solution)

6484-52-2

>1.0%

X

KEY:

Sec. 313 =

Sec. 302 =

Toxic Chemicals, Section 313

Extremely Hazardous Substances (EHS), Section 302

RQ =

TPQ =

Reportable Quantity of EHS

Threshold Planning Quantity of EHS

Urea - Ammonium Nitrate Solution: Disclaimer