Method of foaming a siloxane composition using microwave energy

A method of foaming a silicone composition comprising mixing

• (A) 100 parts by weight of a polydiorganosiloxane gum base stock wherein the gum has a Williams plasticity of greater than 0.030 inch,
• (B) from 0 to 60 parts by weight of an organosiloxane having an average of at least 2 silicon-bonded hydroxyl radicals per molecule, where the organosiloxane (B) has from 0.5 to 3 parts by weight silicon-bonded hydroxyl radicals in the amount of organosiloxane (B) present, only when the microwave sensible material of (F) is an organic alcohol can the organosiloxane of (B) be zero,
• (C) from 3 to 25 parts by weight of an organohydrogensiloxane having an average of at least 2.5 silicon-bonded hydrogen atoms per molecule, where the organohydrogensiloxane has from 0.01 to 0.5 parts by weight silicon-bonded hydrogen atoms in the amount of organhydrogensiloxane (C) present,
• (D) from 0.05 to 0.5 parts by weight of an acetylenic alcohol inhibitor,
• (E) from 1 to 200 parts by weight platinum per one million parts by weight of composition wherein the platinum is in the form of a platinum catalyst, and
• (F) from 0.25 to 30 parts by weight of a microwave sensible material and thereafter
• exposing the mixture to a microwave source to obtain a silicone foam.