... products which is white, nonpoisonous, odourless and amorphous. HS972, HS974, and HS976 are hydrophobic fumed silica.Hydrophobic ... fumed silica has low moisture absorption, great dispersion and rheological adjustment ability towards the polar system. Some ... on system. ApplicationRheology for the process. Thickening for polar liquid, e.g. epoxy resin. Reinforcement for organosilicon elastomer.Large ...