Thermal conductive silicone composition

A thermal conductive silicone composition comprising:

• (A) an organopolysiloxane having at least two alkenyl groups in one molecule and exhibiting a kinetic viscosity of 10 to 100,000 mm2/s at 25° C.;
• (B) a one-terminal-trifunctional hydrolyzable methylpolysiloxane that is in an amount of 50 to 130 parts by mass per 100 parts by mass of the component (A), and is represented by a general formula (1):
• wherein R1 represents an alkyl group having 1 to 6 carbon atoms, and a represents an integer of 5 to 100;
• (C) an aluminum powder having an average particle diameter of 7 to 16 μm;
• (D) a zinc oxide powder having an average particle diameter of not larger than 2 μm, the components (C) and (D) being present in an amount at which a mass ratio {component (C)+component (D)}/{component (A)+component (B)} becomes 8.0 to 14.0, and at which a mass ratio between the components (C) and (D) {component (C)/component (D)} becomes 3.0 to 6.0;
• (E) an organohydrogenpolysiloxane represented by a general formula (2):
• wherein R2 represents an alkyl group having 1 to 6 carbon atoms, and b represents an integer of 5 to 100;
• (F) an organohydrogenpolysiloxane other than the component (E), having at least two silicon atom-bonded hydrogen atoms in one molecule, the components (E) and (F) being present in an amount at which a value of {total number of silicon atom-bonded hydrogen atoms in components (E) and (F)}/{number of alkenyl groups in component (A)} becomes 0.5 to 1.5, and at which a ratio {number of silicon atom-bonded hydrogen atoms in component (E)}/{number of silicon atom-bonded hydrogen atoms in component (F)} becomes 0.6 to 5.0;
• and
• (G) a platinum-based catalyst for hydrosilylation that is in an amount at which platinum atoms are present in an amount of 0.1 to 500 ppm on mass basis with respect to the component (A), wherein
• when a liquid obtained by mixing and dispersing the composition in toluene which is twice the amount of the composition has been sieved, a residue of not more than 5 ppm is observed if using a 250 mesh sieve (mesh size of 63 μm), and a residue of not less than 200 ppm is observed if using a 440 mesh sieve (mesh size of 32 μm).