Reinforced cementitious insulating material and method of preparation thereof

Claim 1

A RELATIVELY LIGHT WEIGHT MASS OF POROUS CEMENTITIOUS HEAT INSULATING MATERIAL CONTAINING REENFORCING FIBER CONSISTING ESSENTIALLY OF A MAJOR PROPORTION OF ASBESTOS FIBER AND A MINOR PORPORTION OF YARN-TYPE GLASS FIBER FILAMENTS, THE ASBESTOS FIBER BEING AT LEAST 75% BY WEIGHT OF THE TOTAL WEIGHT OF THE FIBER AND THE GLASS FIBER BEING PRESENT IN AN AMOUNT UP TO APPROXIMATELY 25% BY WEIGHT OF THE TOTAL WEIGHT OF THE FIBER, AND SUBSTANTIALLY ALL OF THE GLASS FIBER BEING LONGER THAN THE ASBESTOS FIBER.

Claim 3

THE METHOD OF PROVIDING A REENFORCED, RELATIVELY LIGHT WEIGHT MASS OF POROUS CEMENTITIOUS HEAT INSULATING MATERIAL WHICH COMPRISES FORMING AN AQUEOUS SLURRY OF SAID MATERIAL; INCORPORATING REENFORCING FIBER IN SAID SLURRY IN AN AMOUNT OF FROM 5% TO 17.5% BY WEIGHT OF THE TOTAL MASS, SAID REENFORCING FIBER CONSISTING ESSENTIALLY OF AT LEAST 75% BY WEIGHT ASBESTOS FIBER SUBSTANTIALLY ALL LONGER THAN 1/8 INCH, AND LESS THAN 25% BY WEIGHT OF YARN-TYPE GLASS FIBER ROVING COMPOSED OF A PLURALITY OF INDIVIDUAL FILAMENTS THAT ARE SUBSTANTIALLY ALL LONGER THAN SAID ASBESTOS FIBER BUT ARE LESS THAN SUBSTANTIALLY 3 1/2 INCHES IN LENGTH; MIXING SAID SLURRY AND SAID REENFORCING FIBER UNTIL SAID ASBESTOS FIBER AND SAID GLASS FIBER ARE SUBSTANTIALLY UNIFORMLY DISPERSED IN THE SLURRY AND THE MAJOR PROPORTION OF SAID GLASS FIBER ROVING IS DIVIDED INTO INDIVIDUAL FILAMENTS; POURING SAID FIBER CONTAINING SLURRY INTO A MOLD, AND SHAPING THE FIBER-CONTAINING SLURRY IN SAID MOLD.

Claim 4

THE METHOD OF PROVIDING A REENFORCED, RELATIVELY LIGHT WEIGHT MASS OF POROUS CEMENTITIOUS HEAT INSULATING MATERIAL WHICH COMPRISES FORMING AN AQUEOUS SLURRY OF SAID MATERIAL; INCORPORATING REENFORCING FIBER IN SAID SLURRY IN AN AMOUNT OF FROM 5% TO 17.5% BY WEIGHT OF THE TOTAL MASS, SAID REENFORCING FIBER CONSISTING ESSENTIALLY OF AT LEAST 75% BY WEIGHT ASBESTOS FIBER SUBSTANTIALLY ALL LONGER THAN 1/8 INCH, AND LESS THAN 25% BY WEIGHT OF YARN-TYPE GLASS FIBER ROVING COMPOSED OF A PLURALITY OF INDIVIDUAL FILAMENTS THAT ARE SUBSTANTIALLY ALL LONGER THAN SAID ASBESTOS FIBER BUT ARE LESS THAN SUBSTANTIALLY 3 1/2 INCHES IN LENGTH; MIXING SAID SLURRY AND SAID REENFORCING FIBER UNTIL SAID ASBESTOS FIBER AND SAID GLASS FIBER ARE SUBSTANTIALLY UNIFORMLY DISPERSED IN THE SLURRY AND THE MAJOR PROPORTION OF SAID GLASS FIBER ROVING IS DIVIDED INTO INDIVIDUAL FILAMENTS; POURING SAID FIBER CONTAINING SLURRY INTO A MOLD, AND SHAPING THE FIBER-CONTAINING SLURRY IN SAID MOLD.