● Hydrophilic fumed silica is usually designated with the value of specific surface area (m2/g), such as 150, 200, 300 and 380.

● Hydrophobic fumed silica is structure modified silica after treated by HMDS, PDMS and DDS.

● Polydimethylsiloxane — PDMS ； Dichlorodimethylsilane —— DDS ； Hexamethyldisilazane —— HMDS .