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Zinc Borate is one environmental-friendly halogen-free flame retardant. There are some formulations of XZnO. YB2O3. ZH2O, in which Zinc Borate with 3.5 hydrate is called ZB-2335 (2ZnO.3B2O33.5H2O) is the most common used grade. It has owned some excellent properties on non-toxicity, slight solubility in water, good thermal stability, fine particle size, low specific gravity, great free-flowing etc. As one high efficient flame retardant, it is widely used in plastic, rubber, coating etc fields.