Thermally-conductive silicone composition

A method for producing a thermally-conductive silicone gel sheet, comprising uniformly mixing a composition containing a base polymer including a fluorine-free organopolysiloxane and a fluorine-containing organopolysiloxane, an addition-curing catalyst, and a thermally-conductive filler, forming the composition into a sheet-like shape, and thermally curing the composition,

• wherein a ratio of the number of fluoro groups in constituent components of the base polymer to the total number of alkenyl groups bonded to silicon atoms in the constituent components of the base polymer is from 2.00 to 30.0,
• the constituent components of the base polymer include components A1, A2, A3, and B below
• A1:
• fluorine-free organopolysiloxane having two or more alkenyl groups in one molecule,
• A2:
• fluorine-free organopolysiloxane having two Si—H groups in one molecule,
• A3:
• fluorine-free organopolysiloxane having three or more Si—H groups in one molecule, and
• B:
• fluorine-containing organopolysiloxane having two or more alkenyl groups in one molecule,
• the component A2 is contained in an amount of 50 to 100 parts by mass, and the component A3 is contained in an amount of 0.5 to 2 parts by mass, with respect to 100 parts by mass of the component A1 and the component B in total,
• the addition-curing catalyst is contained in a catalytic amount, and
• the thermally-conductive filler is contained in an amount of 100 to 4000 parts by mass with respect to 100 parts by mass of the base polymer.