... in tyre, medicine-making,gel-rubber shoe-making,paint. Silica granularSpecification Item valueMethodAppearancewhite powder / granular Loss on drying 105 ... -1999SiO2 %≥93ISO5794-1:1994Na2SO4 %≤0.8 General description: Precipitated silica with special physic-chemical properties, work as reinforcing transparent fillers ... Light-colored, color and High-grade transparent rubber products. Silica granular