Precipitated Silica White powder Molecular formula:SiO2nH2O Have rubber,tyre,sole,medicine,feed,food grade WHITE SILICAChemical name: Silica, precipitated, hydrated, White carbon blackMolecular formula: SiO2 · nH2OAppearance ... the woven bag made of polypropylene. Net weight is 20KGs. Precipitated Silica tyre grade