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IntroductionZinc Borate(2ZnO·3B2O3·3.5H2O),Molecular weight: 434.75. It is a kind of powder with non-toxic, tasteless, no smell,relative density : 2.67,melt point: 980ºC,Insoluble in ethanol, butanol and acetone,Easily soluble in hydrochloric acid, sulfuric acid and dimethyl.Refractivity: 1.58~1.59,hard to dissolve in cold water,but can dissolve slowly in hot water and turn into 1% solution,stable under 300ºC,once over 300ºC will release crystal water which can absorb heat and dilute oxygen in the air.IndexZinc oxide: 37.5±1.5Boric oxide: 48.0±1.5Water %: =1.0Residue on sieve(45um)%: =1.0Appli