Allantoin
Chemical Name: (2,5-Dioxo-4-imidazolidinyl ) urea
Molecular Formula: C4H6N4O3
Molecular Weight:158.12
Appearance: White crystal powder
Anti-irritating, astringe skin, accelerate wound healing, anti-freeze hand crea
Allantoin is a non-toxic, odorless, anti-irritating and nonallergic crystalline powder which can be soluble in hot water, hot alcohol and dilute sodium hydroxide solution, slightly soluble in cold water and alcohol and almost insoluble in organic solvents such as ether and chloroform. The saturated solution is of weak acid. The PH value of its saturated aqueous solution is 5.5  
Use:
It is an important fine chemicals widely used in pharmacy, light industry, agriculture, daily chemicals and bio-engineering:
1. In Pharmacy: can boost the growth of cells and healing up of wound; also effective to xerodermia, osteomyelitis and hepatocirrhosis etc.
2. In cosmetics: can keep moisture of skin; widely used in freckles cream, shampoo, soap, toothpaste etc.
3. In agriculture: used as plant growth regulator of wheat, rice, vegetables and tea.
Specipication:
Assay(dry)    98.0-101.5%    
Odor    No odor    
Exterior        White powder    
PH    3.50-6.50    
Loss on drying%≤0.2    
Sulfuric ash%<    0.1    
sulphate%<    0.02    
chloride%<    0.004