HEAT EXCHANGERS (SUCH AS OIL COOLERS USED ON HEAVY DUTY CONSTRUCTION EQUIPMENT, TRANSISTOR COOLERS USED IN COMMUNICATIONS EQUIPMENT ON AIRCRAFT, AIR CONDITIONER CONDENSERS, AIR COMPRESSOR COOLERS, ETC.) MADE OF ALUMINUM AND FABRICATED BY A SPECIAL BONDING PROCESS

castable, cement bonded fused silica, for use in the aluminum foundry industry