Mold wash composition and casting mold coated therewith

Claim 1

A MOLD WASH COMPOSITION FOR COATING THE SURFACE OF A SAND MOLD, SAID MOLD WASH COMPSOITIN CONSISTING ESSENTIALLY OF: (A) A VOLATILE LIQUID VEHICLE IN AN AMOUNT TO IMPART A SPRAYABLE CONSISTENCY TO SAID COMPOSITION, SAID VEHICLE BEING SELECTED FROM THE GROUP CONSISTING OF METHANOL, ETHANOL, ISOPROPANOL, ACETONE AND ETHYLENE TRICHLORIDE; (B) POWDERED ZIRCON SUSPENDED IN SAID VEHICLE, SAID POWDERED ZIRCON BEING OF SUFFICIENT FINENESS OF SIZE NOT TO PACK AND NOT TO OBTRUDE TO A DISCERNABLE EXTENT FROM THE SURFACE OF THE DEPOSITED COATING; AND (C) A CHEMICALLY STABLE INORGANIC BINDER MATERIAL HAVING A MELTING POINT IN EXCESS OF 1000*F. DISSOLVED IN SAID VEHICLE, SAID BINDER BEING CAPABLE, UPON VOLATILIZATION OF SAID VEHICLE FROM A COATING OF SAID COMPOSITION, OF BINDING THE GRAINS OF ZIRCON TO ONE ANOTHER AND TO THE SAND AT THE SURFACE OF SAID MOLD, SAID COMPOSITION BEING CAPABLE OF FORMING A CONTINUOUS, SMOOTH, TOUGH REFRACTORY COATING ON THE SURFACE OF A SAND MOLD UPON VOLATILIZATION OF SAID VEHICLE THEREFROM.