Urea

  • Carbonyldiamide
  • Carbamide
Formula
CO(NH2)2
Structure
Description
White crystals, powder or prills. Odorless. Slight ammonia odor may develop especially in presence of moisture, hygroscopic, especially when humidity is over 75%.
Uses
Microbiocide, Fungicide

Registry Numbers and Inventories.
CAS
57-13-6
EC (EINECS/ELINCS)
200-315-5
RTECS
YR6250000
RTECS class
Tumorigen; Drug; Mutagen; Reproductive Effector; Human Data; Primary Irritant
Merck
12,10005
Beilstein/Gmelin
635724
Beilstein Reference
4-03-00-00094
EPA OPP
85702
Swiss Giftliste 1
G-42677
Canada DSL/NDSL
DSL
US TSCA
Listed
Austrailia AICS
Listed
New Zealand
Listed
Japan ENCS (MITI)
Listed
Korea ECL
Listed

Properties.
Formula
CH4N2O
Formula mass
60.06
Boiling point, °C
197
Vapor pressure, mmHg
0.4 (25 C)
Vapor density (air=1)
2.07
Odor Threshold Odor threshold Odorless
Density
1.34 g/cm3 (20 C)
Solubility in water
Very soluble
Viscosity
1.78 MPas 46% solution at 20C
Refractive index
1.484 (20 C)
pKa/pKb
13.90 (pKb)
Partition coefficient, pKow
-2.11
Heat of fusion
13.9 kJ/mol
Heat of vaporization
45.3 kJ/mol
Heat of combustion
-634.1 kJ/mol

Hazards and Protection.
Storage
Store in a tightly closed container. Store in a cool, dry, well-ventilated area away from incompatible substances.
Insufficient information
Handling
Wash thoroughly after handling. Remove contaminated clothing and wash before reuse. Use with adequate ventilation. Minimize dust generation and accumulation. Avoid breathing dust, vapor, mist, or gas. Avoid contact with eyes, skin, and clothing. Keep container tightly closed. Avoid ingestion and inhalation.
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
A respiratory protection program that meets OSHA's 29 CFR 1910.134 and ANSI Z88.2 requirements or European Standard EN 149 must be followed whenever workplace conditions warrant a respirator's use.
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. Provide ventilation.
Stability
Stable under normal temperatures and pressures.
Incompatibilities
Strong oxidizing agents, sodium hypochlorite, sodium nitrate, calcium hypochlorite, nitrosyl perchlorate, gallium perchlorate, diphosphorus pentachloride.
Decomposition
Carbon monoxide, oxides of nitrogen, irritating and toxic fumes and gases, carbon dioxide.

Fire.
Flash Point,°C
73
Fire fighting
Fire Extinguishing Agents: Water
Fire potential
Noncombustible
Hazards
Melts and decomposes, generating ammonia.
Health
1
 
Flammability
0
 
 
Reactivity
0
 

Health.
Poison_Class
5
Exposure effects
Prolonged or repeated exposure may cause adverse reproductive effects. Laboratory experiments have resulted in mutagenic effects. Prolonged exposure or exposure to high concentrations may cause eye damage.
   Ingestion
Causes gastrointestinal irritation with nausea, vomiting and diarrhea. May cause cardiac disturbances. May cause disturbed blood electrolyte balance.
   Inhalation
Inhalation of dust causes irritation of the nose and throat, coughing and sneezing.
   Skin
Causes skin irritation.
   Eyes
Causes eye irritation.

First aid
 
   Ingestion
If victim is conscious and alert, give 2-4 cupfuls of milk or water. Never give anything by mouth to an unconscious person. Get medical aid.
   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. Immediately flush skin with plenty of soap and water for at least 15 minutes while removing contaminated clothing and shoes. Wash clothing before reuse.
   Eyes
Immediately flush eyes with plenty of water for at least 15 minutes, occasionally lifting the upper and lower eyelids. Get medical aid.

Transport.
USCG CHRIS Code
URE
 
HS Code
3102 10 10
 
IMO Chemical Code
18
IMO Pollution Category
(III - USL)