The reason of thermal mechanical test is that no non-ceramic material is completely resistant to heat. Heat resistance is usually measured as change in tensile strength, elongation and hardness.

Low-temperature properties indicate a stiffening range and brittle point. With some materials crystallization occurs, at which time the material is brittle and will fracture easily.
Thermal mechanical test:
Three insulators shall be loaded at ambient temperature to at least 5% of the SML for 1-minute. During this time, the length of the insulators shall be measured. This will be the reference length. The insulators shall then be submitted to thermal variation from -35 ° C to + 50 ° C (ANSI) and -50 ° C to + 50 ° C (CEA) while under a permanent mechanical load of 0.5 SML for 96 hours. The time at each temperature shall be at least 8 hours per cycle. At the end of thermal cycling, the insulators shall be allowed to reach ambient temperature and the length shall again be measured using the same load as for the reference length. The increase in each insulator’s length shall be no more than 2mm.

Thermal mechanical test is an integral part of insulator test. It makes us clear understanding to the situation of the insulator.

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