 | Heat distortion temperature
The temperature is determined at which a sample positioned on bearings at either end (subjected to a concentric) load (while the temperature is raised at a uniform rate, occurs a specified deflection) (outer fiber strain of 0.2 %).
In accordance with the standard, a distinction is drawn between three different methods:
HDT Method A: Flexural stress s = 1.8 N/mm² = const.,
HDT Method B: Flexural stress s = 0.45 N/mm² = const.,
HDT Method C: Flexural stress s = 8.0 N/mm² = const.,
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