Urea 46% Agricultural Grade White Granular 46% Cas No: 57-13-6

PSA: 69.11000
XLogP3: -1.4
Appearance: white powder
Density: 1.3230 g/cm3 @ Temp: 20 A C
Melting Point: 132.70 A C
Boiling Point: 317-389 A C
Flash Point: 53.7A 22.6 A C
Refractive Index: 1.528
Water Solubility: 1080 g/L (20 A C)
Vapor Pressure: <0.1 hPa (20 A C)
Toxicity: LD50 orally in Rabbit: 8471 mg/kg LD50 dermal Rat 8200 mg/kg
Odor: MAY GRADUALLY DEVELOP SLIGHT ODOR OF AMMONIA, ESP IN PRESENCE OF MOISTURE
Taste: Cooling, saline taste
PH: 7.2 (10% solution)
PKA: 0.1(at 21 A C)
Dissociation Constants: pKa = 0.10 at 21 A C (conjugate acid)
Air and Water Reactions: Water soluble.
Reactive Group: Amides and Imides
Reactivity Profile: UREA is a weak base. Reacts with hypochlorites to form nitrogen trichloride which explodes spontaneously in air [J. Am. Chem. Soc. 63:3530-32]. Same is true for phosphorus pentachloride. It reacts with azo and diazo compounds to generate toxic gases. Reacts with strong reducing agents to form flammable gases (hydrogen). Heated mixtures of oxalic acid and urea yielded rapid evolution of gases, carbon dioxide, carbon monoxide and ammonia. Titanium tetrachloride and urea slowly formed a complex during 6 weeks at 80A C, decomposed violently at 90 C, [Chem. Abs., 1966, 64, 9219b]. Urea ignites spontaneously on stirring with nitrosyl perchlorate due to the formation of the diazonium perchlorate. Oxalic acid and urea react at high temperatures to form toxic and flammable ammonia and carbon monoxide gases, and inert CO2 gas [Von Bentzinger, R. et al., Praxis Naturwiss. Chem., 1987, 36(8), 41-42].