Fumed Silica SiO2: 99.8% min. Grade: Nanometer. Used for Silicon Sealant, Window Seal, Gross Rubber, Paint industry. Fumed Silica Specific Surface Area(m2/g) 150+/-20200±25380+/-30pH Value3.6~4.54.0Loss on Drying @ 105°C(%) 1.5 max0.68Loss on Ignition @ 1000°C(%) 2.5 max0.48Sieve Residue(%) 0.05 max0.023Tamped Density(g/l) 25~6040SiO2 Content(%) 99.8 min99.86Carbon Content(%) 0.2 max0.041Chloride ...