... 2.Cas no.: 16893-85-9 3.Sodium Silicofluoride : 99% min SODIUM SILICOFLUORIDE Product Details:1.Purity 99% min ,free-flowing dry ... 1 x 20FCL: 25MTSpecifications:Appearance:white powderContent---------------99.0% min.Free Acid(HCL)--------0.10% maxWater insoluble Matter--0. ... maxMoisture--------------0.5% max.Fineness(250 um sieve)90.0% min.Iron, Fe--------------0.02% maxChloride, Cl----------0.15mg/ml ...