Zinc borate is a kind of environmental friendly inorganic flame retardants, the most common one is 3.5 water zinc borate, formula weight is 434.62, white powder, slight soluble in water, insoluble in HCL, amorphous powder is very easy soluble in water. this product works as a kind of flame retardants, has some excellent properties of no toxic, insoluble in water, high thermal stability, small particle size, good distribution etc. Zinc borate can be used as synergist and direst substitute for antimony trioxide, brominated and phosphor based FRs. It ca be used for milk glass, ceramic, paint and wood plastic industries as bacteriostatic agent.