Foamable silicone composition and the use thereof

A foamable silicone composition, comprising:

• (a) at least one organopolysiloxane containing at least two alkenyl groups bonded to silicon atoms per molecule,
• (b) at least one organopolysiloxane containing at least two hydrogen atoms bonded to silicon atoms per molecule, comprising:
• (b1) an organopolysiloxane containing at least three hydrogen atoms bonded to silicon atoms per molecule, and
• (b2) an organopolysiloxane containing two hydrogen atoms bonded to silicon atoms at both ends of the chain per molecule,
• (c) porogenic agents generating gaseous hydrogen in the presence of component (b), comprising
• (c1) an organopolysiloxane containing at least one hydroxyl group bonded to silicon atom per molecule, and
• (c2) water, and
• (d) hydrosilylation catalyst;
• with the proviso that the ratio of the number of moles of hydroxyl groups provided by component (c2) to that provided by component (c1) is within a range of from 1:5 to 20:1, and the composition has a dynamic viscosity of from 200 to 10,000 mPa·s at (23±2°) C. before curing measured by Brookfield viscometer using No. 2 spindle at a speed of 10 rpm.