Inorganic coating and bonding composition

Claim 1

A COATING AND BONDING COMPOSITION CONSISTING ESSENTIALLY OF A DISPERSION OF INORGANIC SOLID PARTICULATE MATERIAL HAVING A GRAIN SIZE LESS THAN 325 MESH DISPERSED IN AN AQUEOUS SOLUTION TO SOLUTE OF WHICH CONSISTS ESSENTIALLY OF A COMBINATION OF INORGANIC COMPOUNDS FROM THE GROUP CONSISTING OF PHOSPHORIC ACID, CHROMIC ACID, MOLYBDIC ACID AND THE METAL SALTS OF SAID ACIDS, THE COMBINATION OF COMPOUNDS IN SAID SOLUTION BEING SUCH AS WILL PROVIDE AT LEAST ABOUT .5 MOL PER LITER DISSOLVED PHOSPHATE, AT LEAST .3 MOL PER LITER DISSOLVED MATERIAL FROM THE GROUP CONSISTING OF CHROMATE AND MOLYBDATE, AND AT LEAST .2 MOL PER LITER DISSOLVED METAL, SAID SOLID PARTICULATE MATERIAL BEING SUBSTANTIALLY INSOLUBLE IN SAID SOLUTION AND BEING PRESENT IN AN AMOUNT OF FROM ABOUT 10 TO 2000 GRAMS PER LITER OF SAID SOLUTION, FROM ABOUT 1 TO 100 GRAMS PER LITER OF SAID SOLID PARTICULATE MATERIAL BEING A SUBMICRON GRAIN SIZE GEL-FORMING MATERIAL WHICH FORMS A HYDROUS COLLIDAL GEL WITH SAID SOLUTION, SAID COMPOSITION BEING HEAT CURABLE UPON DRYING THEREOF TO A SUBSTANTIALLY WATER INSOLUBLE MATERIAL WITH ALL OF SAID PARTICULATE MATERIAL BEING BONDED THEREIN.