... silica,absorbent,and as the main material for production.2.Application:Mainly used for paper,soap, ... industry,mineral flotation.,3.Specification: Product nameSodium SilicateAppearanceTransparent glass-like blockTotal content of dissolve solid98% minTotal Fe0 ... .5Alkalinity as Ca(OH)20.35% maxSulphate contente (as CaSO4)0.20% maxTesting methodGB/T4209-1996 Sodium Silicate solid Water glass na2sio3