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HEAP SAND. Also referred to as system sand or unit sand; usually regarded as sand "heaped'' on the foundry floor after it has been reclaimed and placed in "heaps'' for reuse; chiefly used as "backing sand.''
HEAT. A stated tonnage of metal obtained from a period of continuous melting in a cupola or furnace; or the melting period required to obtain that tonnage.
HEAT CHECKING. Formation of fine cracks in a die surface due to alternate heating and cooling. These cracks are reflected in the surface of the casting.
HEEL. Metal left in ladle after pouring has been completed, metal kept in channel type induction furnaces during stand-by periods.
HIGH PRESSURE MOLDING. A mold which has been compacted by hydraulic squeezing at a pressure greater than 100 pounds per square inch on the pattern plate. The resulting mold must have a hardness greater than 85 on the AFS B scale meter.
HOT BLAST. Blast which has been heated prior to entering into the combustion reaction.
HOT BOX PROCESS. A furan resin based core-making process similar to shell core-making. Cores are solid throughout unless a mandrel is used.
HOT-CHAMBER MACHINES. Die-casting machines which have plunger or injection system in continuous contact with molten metal.
HOT SPOTS. Localized areas of a mold or casting where high temperatures are reached and maintained for a period of time.
HOT STRENGTH. Strength of sand mix as determined at any temperature above room temperature.
HOT TEAR. Surface discontinuity of fracture caused by either external loads or internal stresses or a combination of both acting on a casting during solidification, and subsequent contraction at temperatures near the solidus.
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