Aerosil R 106 Silicium dioxide 68 583-49-3 Degussa Extenders / Fillers >> Silica Rheology Modifiers / Thickeners >> Mineral >> Fumed Silica Rubber - Elastomer (Chloroprene, Butyl …) Silicones (Si) SEALANT Aerosil R 106 is a hydrophobic fumed silica. Used in sealants Thickening agent for silicone sealants rheology control of binders and polymers improvement and maintenance of free flow and anti caking characteristics of powder Hydrophobic fumed silica. Possesses a low chloride content. Used as a thickening agent for silicone sealants.