Urea, also known as urea or carbamide, is a final product of protein metabolism in humans and mammals, and it is also a major organic nitrogen compound excreted by the animal body. The pure product is white granular or needle-like, prismatic crystals. If mixed with heavy metals such as iron, it appears light red or yellow. Odorless and tasteless, it is readily soluble in water, ethanol and benzene, but poorly soluble in ether. At 20ºC, 100 kilograms of water can dissolve 105 kilograms of urea, and the dissolution process absorbs heat. The aqueous solution shows a neutral reaction. The nitrogen content of the pure product is 46.65%, that of agricultural urea is 42% – 46%, and it contains a small amount of biuret, generally less than 2%, which is usually harmless to crop growth. The specific gravity and bulk density of urea are both relatively low, and each cubic meter of fertilizer weighs 0.65 tons.
Beyond its primary role as a fertilizer, urea demonstrates remarkable versatility in various industries. It is an integral component in the manufacture of paints, glues, plastics, paper, textiles, and animal feed. Additionally, it is utilized in weed control chemicals and as a source of non-protein nitrogen, showcasing its multifunctional and adaptable utility across diverse sectors.
It is used as a raw material for fertilizers, animal feed, stabilizers and the production of urea-formaldehyde resins, etc.
It is used as a nitrogen fertilizer in agriculture, a feed additive in industry, and as a stabilizer and urea-formaldehyde resin, etc
It is a crop fertilizer used to improve the utilization rate of nitrogen in urea. It is also used as yeast food. Chewing gum tissue improver. It is used in alcoholic beverages, gelatin products, wine, and yeast-fermenting baked goods.
Urea is mainly used as a fertilizer. It is also used in industry as a raw material for manufacturing urea-formaldehyde resin, polyurethane, and melamine-formaldehyde resin, and has extensive applications in medicine, leather tanning, flotation agents, pigments, and dewaxing of petroleum products.
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Test Items
|
Limit
|
Result
|
|
Assay
|
≥99.0%
|
99.2%
|
|
Melting
|
132-135
|
–
|
|
Water insolubility
|
≤0.005%
|
0.003%
|
|
moisture
|
0.46%
|
|
|
Biuret
|
≤0.6%
|
0.45%
|
|
NH3
|
≤0.2%
|
0.0030%
|
|
CL
|
≤0.00015%
|
<0.00015%
|
|
SO4
|
≤0.001%
|
<0.001%
|
|
PO4
|
≤0.00015%
|
<0.0001%
|
|
CO3
|
≤0.5%
|
<0.2%
|
|
Na
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≤0.00015%
|
0.000087%
|
|
K
|
≤0.00015%
|
0.00008%
|
|
Ca
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≤0.00015%
|
0.000091%
|
|
Mg
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≤0.00015%
|
0.000079%
|
|
Fe
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≤0.00015%
|
0.000085%
|
|
Cr
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≤0.00006%
|
null
|
|
Ni
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≤0.00006%
|
null
|
|
Zn
|
≤0.00006%
|
null
|
|
Cu
|
≤0.00006%
|
null
|
|
Al
|
≤0.00006%
|
<0.0006%
|
|
HCOH
|
≤0.0015%
|
0.0001%
|
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