Sodium fluorosilicate Molecular formula and weight: na2sif6=188.06 Physical and chemical properties: The sodium fluorosilicate is white crystallize or crystallize powder, specific weight is 2.68, tiny dissolve in the water, do notdissolve in the alcohol, have the causticity, poisonous, at above 450f¦ burn empress, resolve the sodium fluoride and silicon tetrafluoride. Uses: use for insecticide, lead alloy welding flux, leather, enamel flux, pottery glaze, opal glass and medical industries, etc. Quality standards: Index excellent first qualitied Sodlum fluorosilicate content, %fª 99.0 98.5 97.0 Free acid (as hcl) content, %f_ 0.10 0.15 0.20 105f¦ weight less on dry, %f_ 0.30 0.40 0.60 Fe content, %f_ 0.02 - - Finess (250¬ªm mesh scroon), %fª 90 90 90