Tetrahalosilane blends for treating silica

By a silica are to a weight ratio of 1∶0.1 to 1∶2 the organic the halogenated organic and halogenated organic polyblends or the mixture material, preparing modified silica filler. Although of the preferred the dialkyl the silane compound of the formula silane to the two silane of tetrachloro silicon, wherein the stabilizing or the mixture of - comprising an additional silane to the 巯 propyl triethoxsilane the composition.