Foamable silicone rubber composition

A foamable silicone rubber composition comprising;

• (A) a polyolefin dispersion obtained by polymerizing monomers having a polymerizable aliphatic unsaturated double bond, dispersed in a dispersion medium of an organopolysiloxane having a viscosity of from 50 cSt to 1,000,000 cSt at 25.degree. C. whose molecular chain both terminals are terminated with a silanol group, to form a polyolefin in said silanol group-containing organopolysiloxane;
• (B) an organohydrogenpolysiloxane represented by the average compositional formula (1):
• (R.sup.1).sub.a (H).sub.b SiO.sub.(4-a-b)/2 ( 1)
• wherein R.sup.1 represents a substituted or unsubstituted monovalent hydrocarbon group having no aliphatic unsaturated bond, a and b are positive numbers that satisfy 0<a<3, 0.05.ltoreq.b<3 and 0.8.ltoreq.a+b.ltoreq.3;
• and having at least two hydrogen atoms bonded to silicone atoms in one molecule;
• (C) at least one member selected from the group consisting of water, an alcohol, a silanol group-containing organosilane, and a silanol group-containing siloxane having a viscosity of less than 50 cSt at 25.degree. C.;
• and
• (D) a platinum family metal catalyst.