April 23, 2021

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TMA

Thermal Mechanical Analyzer

Thermal Mechanical Analyzer

Left: Perkin Elmer TMA7

The Thermal Mechanical Analyzer (TMA) is used to measure the change in deformation of a sample under a non-oscillating load as a function of time or temperature. The TMA can be useful in determining the coefficient of thermal expansion, softening, sintering and the glass transition temperature of a material. A cylindrical sample is typically used and placed in the sample holder. Then a probe is lowered to touch the sample. A high-quality furnace is then raised around the sample holder and probe. As the temperature changes, the change in dimension of the sample is recorded by the probe’s position. The measurements may also be taken at a constant temperature and the dimensional changes recorded as a function of time.