Titanium Dioxide P 25 Titanium dioxide Degussa Extenders / Fillers Rheology Modifiers / Thickeners >> Metal organic gellant Silicones (Si) SEALANT Titanium dioxide P 25 Used in 1-K silicone sealants Effect : anti-sag, thixotropy, reinforcement, Improves thermal stability Titanium dioxide. Used in 1-K silicone sealants. Provides anti-sagging, thixotropic effects, and reinforcement. Improves thermal stability.