Abstract: A composition is described herein that includes a fluorosilicone, a silicon-based crosslinker, a reinforcement filler, a curing catalyst, a first non-reactive spacer filler, and a second filler comprising one or more silanol groups. Methods of using such a composition are also described.

Abstract: A silicone emulsion free of a surfactant and an emulsifier is disclosed. The emulsion includes a dispersed oil phase having a polyorganosiloxane with one or more hydroxyl groups in a continuous aqueous or anhydrous organic diol phase including an anionic polymer.

Abstract: Compositions for forming a silicone elastomer and the silicone elastomers thereby which have improved characteristics and which can be used for medical devices are disclosed. The composition for forming a silicone elastomer can include (A) an organopolysiloxane having silicon-bonded alkenyl groups; (B) an organohydrogensiloxane having an average of two or more silicon-bonded hydrogen atoms in the molecule; (C) an inorganic filler; and (D) a filler treatment agent which includes an alkenyl-containing group, e.g., an alkenyl-containing organosilane or organosilazane.

Abstract: A thermally stable polysiloxane composition is a cross-linked product of a Part A composition, of a Part B composition and a catalyst, the Part A composition being a polysiloxane having 60 to 75 percent by weight phenyl groups, the Part B composition being a polysiloxane having 50 to 80 percent by weight phenyl groups. The composition has the properties of optical clarity as measured by 90% or greater transmission of light of 400 nm wavelength in a 1.0 centimeter path, a refractive index at 589 nm of 1.545 or greater and still has 90% or greater transmission of light of 400 nm wavelength in a 1.0 centimeter path after exposure to 150° C. for 6 hours. The composition is well suited for application as an optically transmissive cover or lens for light emitting diodes and for use in other optical and related devices.