Method and composition for detecting flaws in metallic surfaces, holes and otherwise

Claim 1

A COMPOSITION FORMING A ROOM TEMPERATURE VULCANIZABLE CASTING MATERIAL FOR PRECISE VISUAL INSPECTION OF MAGNETICALLY INDUCTIVE SUBSTANCES BY APPLICATION OF THE MATERIAL DIRECTLY TO A WORKPIECE TO BE INSPECTED, SOLIDIFYING IN SITU TO ELASTIC FLEXIBLE FORM AND REMOVING THE CASTING, FOR DETERMINING AND PERMANENTLY RECORDING THE PRESENCE OF A FLAW OR FLAWS IN THE WORKPIECE BY MIGRATION OF MAGNETIZABLE PARTICLES IN THE COMPOSITION TO THE FLAWED AREA WHEN THE WORKPIECE AND CASTING MATERIAL ARE SUBJECTED TO MAGNETIC FLUX COMPRISING: A BASE FORMULATON HAVING A. ABOUT 100 PARTS BY WEIGHT SILICONE RUBBER COMPOUND, VULCANIZABLE AT ROOM TEMPERATURE BY ADDITION OF SUITABLE CATALYST MATERIAL THERETO, AND COMPRISING A SUBSTANTIALLY LINEAR POLYDIMETHYL SILOXANE B. ABOUT 0.1 TO 10.0 PARTS BY WEIGHT OF FERROMAGNETIC PARTICLES IN THE SIZE RANGE OF FROM ABOUT 5 TO 60 MICRONS; C. A LIQUID NAPHTHA HYDROCARBON DILUENT IN AN AMOUNT SUFFICIENT TO ADJUST VISCOSITY OF THE FORMULATION TO WITHIN A RANGE OF ABOUT 1 TO ABOUT 120 POISES; AND ABOUT ABOUT 0.2 TO ABOUT 6 PARTS BY WEIGHT PER 100 PARTS OF SAID BASE FORMULATION OF A CATALYST COMPRISING A METALLIC SOAP FOR VULCANIZING SAID SILICONE RUBBER COMPOUND TO SAID FLEXIBLE ELASTIC FORM; SAID RUBBER DIFFERING IN COLOR FROM SAID FERROMAGNETIC PARTICLES TO PROVIDE VISUAL CONTRAST BETWEEN SAID COMPOSITION AS A WHOLE AND AN ACCUMULATION THEREIN OF SAID PARTICLES AT THE AREA OF A DETECTED FLAW WHEN SAID COMPOSITION IS CURED OR VULCANIZED.