Sipernat 383 DS Silica 112926-00-8 Degussa Extenders / Fillers >> Silica Rheology Modifiers / Thickeners >> Mineral >> Synthetic Silica Sipernat 383 DS is a very fine particle, hydropihile, silica with alkaline pH. Synthetic, amorphous silica. Offers good reactivity Synthetic, amorphous, hydrophile silica with alkaline pH. Offers good reactivity.