Insulator coat for combustion chambers

Claim 1

A HEAT-CURABLE INSULATOR MIXTURE SUITABLE FOR PROTECTING METAL SURFACES AGAINST COMBUSTION TEMPERATURES OF GAS GENERATORS AND SUITABLE FOR BEING CURED AT LOWER TEMPERATURES OR FOR SHORTER TIMES, WHICH MIXTURE CONSISTS ESSENTIALLY OF (1) AN UNCURED THERMOSETTING RESIN WHICH PRODUCES WATER DURING CURING AT A CURE TEMPERATURE, SAID RESIN BEING A MEMBER OF THE GROUP CONSISTING OF PHENOLIC RESINS, UREA-FORMALDEHYDE RESINS, AMINOTRIAZINE-ALDEHYDE RESINS, AND FURFURYL ALCOHOL-ALDEHYDE RESINS, (2) EXPANDED-VERMICULITE PARTICLES, AND (3) INORGANIC SALT PARTICLES WHICH ARE CAPABLE OF FORMING A SALT HYDRATE WITH WATER AT TEMPERATURES NOT MORE THAN SAID CURE TEMPERATURE AND CAPABLE OF RELEASING WATER ABOVE SAID CURE TEMPERATURE AND BELOW SAID COMBUSTION TEMPERATURE, SAID VERMICULITE PARTICLES AND SALT PARTICLES BEING DISPERSED IN SAID RESIN IN A SUBSTANTIALLY UNIFORM MANNER, SAID VERMICULITE PARTICLES BEING PRESENT IN ABOUT 20-80 PARTS BY WEIGHT PER 100 PARTS BY WEIGHT OF RESIN, AND SAID SALT PARTICLES BEING PRESENT IN AN AMOUNT WHICH IS SUFFICIENT TO COMBINE WITH THE WATER PRODUCED DURING THE CURING OF THE RESIN.