... black/silica Precipitated powder Molecular formula:SiO2nH2O we have rubber,tyre,sole,medicine,feed,food,medicine WHITE SILICAChemical name: ... properties, it is the best transparent reinforcement additive in rubber-based blends. It can greatly improve the aging resistance, ... reinforcing effect as that of carbon black, and it can make rubber products with light color or transparency. Used for [food ...