Product Name: Fumde Silica Other Name: White Carbon Black; SiO2; Molecular Formula: SiO2(H2O)x Molecular Weight (g/mol): 60.08 Melting Point ( �°C): 1610 Boiling Point (�°C): 100 Min. Density (25 �°C, g/cm3): 2.6 Refractive Index (n20 D): 1.544 Specification: Testing Item Standard Content (%) 99.8 Min. Specific surface area (m2/g) 176-225 pH 3.6-4.5 Burning loss weight (m/m, %) 2.5 Max. Volatiles Content (105 C, %) 3.0 Max. Appearance White solid colloidal micro-particle HS CODEï¼?2811229000 CAS No.: 10279-57-9 EINECS: 238-878-4 Packages: 25kgs/drum or as customized package. Usage: Used as a paint coating filler.