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A high temperature insulating structure adapted for use in a vibratile structure such as a manifold reactor or the like for automobiles, said structure consisting of two walls defining therebetween a space filled with heat insulating material, said material being formed by firing a slurry prepared b

A high temperature insulating structure adapted for use in a vibratile structure such as a manifold reactor or the like for automobiles, said structure consisting of two walls defining therebetween a space filled with heat insulating material, said material being formed by firing a slurry prepared by mixing a water solution of a phosphate compound and a heat resisting material consisting of 20 -70 % by weight of silicon dioxide, 15 -80 % by weight of aluminium oxide, and 0 -30 % by weight of magnesium oxide.

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A high temperature insulating mass, comprising a double walled structure and a porous ceramic insulating layer provided in a space between the two walls of said double walled structure, said porous ceramic insulating layer having been formed by filLing said space with a slurry containing a heat resi

A high temperature insulating mass, comprising a double walled structure and a porous ceramic insulating layer provided in a space between the two walls of said double walled structure, said porous ceramic insulating layer having been formed by filLing said space with a slurry containing a heat resistant material, a water solution of an acid, aluminum dihydrogen orthophosphate and a powdery metal capable of reacting with said water solution to produce hydrogen gas at room temperature, and firing said slurry after the production of hydrogen gas to fix said hydrogen gas and thereby forming the porous ceramic insulating layer, said heat resistant material consisting essentially of 20 to 70% by weight of silicon dioxide, 15 to 85% by weight of aluminum oxide and 0 to 30% by weight of magnesium oxide.