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Heat Deflection Temperature

Test ID  

This test determines the temperature at which a material deflects a given distance. The specimen, a rectangular bar, is placed in an oil bath which is heated at a constant rate and subjected to a standard stress level. The temperature at which the specimen has deflected the specified amount is recorded.    
The test can be carried out edgewise, flatwise or at different applied stress levels. Please note edgewise is no longer acceptable for the ISO testing.  
ASTM D648  
ISO 75  
Data see sample data  
A heat deflection temperature is reported. This data appears in Matereality as Heat Deflection Temperature.  
Replicates (# of times this test is repeated)  
5 - flex bars [details]


This test is often used for quality control or to qualify a material for automotive use.