Heat distortion temperature. The temperature at which a standard test bar deflects under a stated load.

Heat deflection temperature. See Deflection temperature under load (DTUL).

HEAT DEFLECTION TEMPERATURE. The temperature at which a standard sample of a material will deflect 0.010 inches under a specified load, in this case 264 pounds per square inch. (Also know as heat-distortion point). Typically, a material with a higher HDT will perform better, that is, resist distortion better, in high-heat situations. However, an evaluation of the exact environment and potential stresses of the end use is recommended for the final determination of material suitability.

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