Product description: Sodium Fluorosilicate Formula:　Na2SiF6 Molecular Weight:　220.26 UN. NO.:　2674 HAZARD CLASS:6.1 H.S. CODE:2826.2000 Physical chemistry properties: Colorless, odorless, poisonous and hygroscopic hexa-square crystal. Relative density is 2.679. either dissolvable substances, but undissolved in alcohol. Solubility is acid is larger than in water. Decomposed as fluoride and silicon oxide in alkali solution. Decomposed as Sodium fluoride and silicon fluoride over 300℃. Usage: It can be used as white-adding reagent of porcelain enamel and glass, melt-supporting reagent, antiseptic of wood, insecticide in agriculture, moisture absorption reagent of acid tolerance cement, solidification matter of natural latex products, supplement of electrode posit trilateral of zinc-ferric nickel, filling substance of plastic. Also used in artificial cryolite, sodium fluoride production and medical industry and drinking water treatment. Specification: Na2Sif6 (based on dried basis) ≥99% Dissociation acid (as HCl) ≤0.1% Sulphate(as SO4) ≤0.25% Fe ≤0.02% Water undissolvable substance ≤0.40% Lost weight of 105℃ dried ≤0.30% Passing through 250/μm screen ≥90%