TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preferred Components: The thermally conductive filler has an average particle size of less than 5 microns. The thermally conductive filler is ground quartz.    TECHNOLOGY FOCUS - POLYMERS - Preferred Composition: The composition comprises thermally conductive filler. The composition comprises: (A) an organopolysiloxane having an average of at least 0.5 silicon-bonded alkenyl groups per individual polymer molecule; (B) an organopolysiloxane curing agent having at least two silicon-bonded hydrogen atoms per molecule; (C) a hydrosilylation catalyst; (D) a thermally conductive filler; and optionally further comprises at least one of (E) a silicone fluid; (F) filler treating agent; (G) an adhesion promoter; (H) a solvent or diluent; (I) a surfactant; (J) an acid acceptor; and (K) a hydrosilylation stabilizer. Preferred Components: The polymer comprises polyurethane, an organopolysiloxane, polyisobutylene, or its copolymer. EXAMPLE - A composition (test) in the form of soft tacky gel comprising 53.1 wt.% of organopolysiloxane having an average of at least 0.5 silicon-bonded alkenyl groups per individual polymer molecule and having viscosity of 500 mPa.s; 0.54 wt.% of organopolysiloxane curing agent having at least two silicon-bonded hydrogen atoms per molecule; 0.16 wt.% of hydrosilylation catalyst i.e. Pt catalyst; 45 wt.% of thermally conductive filler i.e. ground quartz; and optionally further at least one of 1.18 wt.% of pigment and 0.02 wt.% of inhibitor was prepared. Control composition comprising 28.3 wt.% of organopolysiloxane having an average of at least 0.5 silicon-bonded alkenyl groups per individual polymer molecule and having viscosity of 500 mPa.s and 5.8 wt.% of organopolysiloxane having an average of at least 0.5 silicon-bonded alkenyl groups per individual polymer molecule and having viscosity of 75 mPa.s; 0.95 wt.% of organopolysiloxane curing agent having at least two silicon-bonded hydrogen atoms per molecule; 2.92 wt.% of hydrosilylation catalyst; 60.8 wt.% of thermally conductive filler i.e. ground quartz; and optionally further at least one of 1.1 wt.% of pigment and 0.05 wt.% of inhibitor was prepared. The test/control composition was evaluated for tackiness and viscosity and showed tackiness of 11.2 g/0.2 g and viscosity of 2600/3100 MPa.s.