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Appearance White powder Purity (SiO2, %) >= 96 Oil absorption (cm3/g) 2.0~ 3.0 Loss on drying (%) 4.0~ 8.0 Loss on ignition (%) =<8.5 BET (m2/g) 170~ 240 pH (10% solution) 5.0~ 8.0 Sodium sulfate (as Na2SO4, %) =<1.0 Arsenic (As) =< 3mg/kg Lead (Pb) =< 5 mg/kg Cadium (Cd) =< 1 mg/kg Mercury (Hg) =< 1 mg/kg Total heavy metals (as Pb) =< 20 mg/kg Total plate count =<500cfu/g Salmonella spp./ 10g Negative Escherichia coli/ 5g Negative