Low density ablator compositions

摘要: Two types of highly filled, elastomeric silicone-base abiative compositions whose densities range from about 0.20 g/cc to 0.30 g/cc. One type is a carbon char forming, high thermal efficiency ablator containing at least 92 percent by volume low density filler with total filler-to-resin volumetric ratio 16 1. The additives comprise ground cork, silica or glass microspheres, phenolic microballons and and/or fibers. second RF-transparent 90 11 microspheres