Thermal insulation and ablation material

Claim 1

A THERMAL INSULATION AND ABLATION MATERIAL COMPRISING: (A) ABOUT 80% BY WEIGHT OF A CURED ORGANOPOLYSILOXANE MADE FROM A METHYL AND PHENYL SUBSTITUTED FLUID ORGANOPOLYSILOXANE CURABLE BY A PLATINUM CATALYST TO A FLEXIBLE ELASTOMERIC SOLID AND CONSTITUTED OF: (1) A HIGH POLYMER DIMETHYL SILOXANE FLUID HAVING A SMALL PROPORTION OF VINYL SUBSTITUENTS AND HAVING DISSOLVED THEREIN A SOLID RESINOUS COPOLYMER OF SILICA AND R3SIO1/2 IN WHICH THE R GROUPS ARE PRINCIPALLY METHYL WITH A SMALL PROPORTION OF VINYL, THE TOTAL VINYL CONSTITUTING LESS THAN 10 MOL KPERCENT OF THE TOTAL ORGANO SUBSTITUENTS BONDED TO SILICON IN THE FLUID, AND (2) AN AMOUNT OF PLHENYL, METHYL AND HYDROGEN SUBSTITUTED FLUID SILICONE HAVING SUBSTANTIALLY 3 HYDROGENS PER 7 PHENYL AND METHYL RADICALS ON A MOL BASIS SUFFICIENT TO PROVIDE SUBSTANTIALLY EQUIVALENT HYDROGEN AND VINYL IN THE ORGANOPOLYSILOXANE, (B) ABOUT 9.6% BY WEIGHT OF HOLLOW SILICA SPHERES, (C) ABOUT 9.6% BY WEIGHT OF JPOTASSIUM TITANATE FIBERS, AND (D) ABOUT 0.8% BY WEIGHT OF DRY BORIC ACID, SAID MATERIAL BEING APPLICABLE IN ITS WET FORM TO A SUBSTRATE IN A SINGLE COATING OF DESIRED THICKNESS AND BEING FORMABLE INTO A CONTINUOUS TOUGH SMOOTH SURFACED FLEXIBLE RESILIENT SHEET SUITABLE FOR BONDING TO A IRREGULAR SUBSTRATE.