Furnace combustion chamber with a transverse composition differential

Claim 1

A FILTER MOLDED FURNACE COMBUSTION CHAMBER FORMED BY A CHAMBER WALL MEMBER COMPRISING REFRACTORY FIBER AND INORGANIC BINDER, THE WALL MEMBER BEING SUBSTANTIALLY UNIFORMLY THROUGHOUT OF A HETEROGENEOUS COMPOSITION TRANSVERSELY THROUGH ITS THICKNESS FROM THE INNER SURFACE OF THE WALL FORMING THE CHAMBER TO THE OUTER SURFACE OF THE WALL FORMING THE CHAMBER AND HAVING A MAXIMUM CONCENTRATION OF THE SAID INORGANIC BINDER ACCUMULATED IN THE AREA ADJACENT AND APPROXIMATELY CONTERMINOUS THE OUTERMOST SURFACE OF THE WALL FORMING THE COMBUSTION CHAMBER PROVIDING A RELATIVELY NON-POROUS AND HIGH DENSITY, HARD, STRONG EXTERNAL SURFACE AREA, AND A MAXIMUM CONCENTRATION OF THE REFRACTORY FIBER ACCUMULATED IN THE AREA ADJACENT AND APPROXIMATELY CONTERMINOUS THE INNER-