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Heat Deflection Temperature (HDT) and Deflection Temperature Under Load (DTUL) are equivalent terms that reflect the temperature at which a material subjected to a three-point bending load deforms to a pre-determined position. The actual force applied to the sample and the amount of deflection required depend upon the sample geometry. ASTM D648 defines a standard set of these parameters. However, alternative arrangements such as the TMA flexure probe configuration (Figure 1) can be used to simulate this ASTM method, using the procedure described below.
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