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T-Z   THERMOPLASTIC Any material which melts on heating and resets on cooling. This melting and refreezing can be repeated indefinitely. THERMOSET Any material which melts on heating but then undergoes a permanent chemical change after which it is heat stable (i.e. it will degrade on further heating rather than "melt"). UNDERCURE Removing rubber from the mould before the vulcanisation process has been completed. Often results in porosity in the rubber or unusually poor compression set. VULCANISATION The permanent chemical change that a rubber undergoes on heating together with chemicals. The chemicals which accomplish this change are called "vulcanising agents".