Chitosan is a kind of natural amino amylose polymer distilled from crab shells in the deep ocean of Alaska. It is the most precious natural resource and has the good name of the sixth life element of human body.

　Chitosan products are widely used in the lines of medical care, weaving,agriculture,tobacco,foodstuff,environmental protection and chemical industries,etc. 

Medical and food grade chitosan	the major indexes
deacetylation	75%－95%
moisture	8%
ash cntent	0.66%
viscosity	20-500 mpa.s（20℃）
As	0.2mg/Kg
heavy metal(Pb)	0.3mg/Kg
hydrargyrum	0.1mg/Kg
bulk density	0.32g/Cm3
mesh size	20-120