Low density organopolysiloxane foam with filler

A composition comprising a polyorganosiloxane foam interspersed with, based on the weight of the composition, from 30 to 50 weight percent of one or more fillers selected from the group consisting of metals, metal oxides, metal hydroxides, metal acetates, metal carbides, metal oxycarbides, metal carbonates, metal bicarbonates, metal hydroxycarbonates, metal nitrides, metal nitrates, metal sulfates, metal chlorides, metal silicides, metal silicates;

• wherein the foam has a density in the range of from 0.20 g/cm3 to 0.60 g/cm3 and the foam comprises Si—O—R′ groups and Si—X—R″ groups at a SiOR′:SiX—R″ ratio in the range of from 0.4:1 to 7:1, where each X is independently O or CH2CH2, O—R′ is a remnant of a blowing agent, and X—R″ is a remnant of a vinyl-substituted or an OH-substituted polyorganosiloxane.