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Precipitated Silica ( silicon dioxide ) Una.180 Una.180 is a white amorphous powder and granule that dissolves in caustic alkali and hydrofluoric acid. It does not dissolve in other acids, water and other kind of melting agents. This product can be used in soles, tire, silicon rubber, plastic, painting and medicine. Packing: PP/woven bag, EVA/woven bag, kraft paper bag Range of application Tint, color, transparent rubber productTechnical Index:ItemValueAppearanceWhite PowderLoss on drying 105oC , 2h %4.0 - 8.0Ignition loss 1000oC %≤7.0PH value5.0-8.0CTAB specific surface area m2/g110 - 240DBP absorption value cm3/g2.10 - 3.50SiO2%≥93.0Fe mg/kg≤1000Sieve residue 45um %≤0.5