White carbon black/silica Precipitated powder Molecular formula:SiO2nH2O we have rubber,tyre,sole,medicine,feed,food, ... Silica, precipitated, hydrated, White carbon blackMolecular formula: SiO2 · nH2OAppearance: white granules or powderUse:It is widely used in the shoe making and ... value: cm3/g2.5-3.0Package:Packed with double-layer plastic bag. The inner layer is made of PE and the outer layer is ...