Heat Deflection Temperature(HDT) under The Specified Load Test

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Summary

HDT is defined as the temperature at which a polymer or plastic plate deforms under a specified load. HDT is measured by the following test outlined in JIS K7191-1,2(Recommended) or ASTM D648. A test specimen is loaded in three–pointing bending in the flatwise or the edgewise direction in an oil bath and the temperature of oil is increasing at 2 /min until the specimen deflects the specified mm.

Test Methods

Standard Direction of a test Specimen Specimen Size Bending Stress
JIS K7191-1、-2 Flatwise
(recommend)
l:80±2mm
b:10±0.2mm
h:4±0.2mm
Method A:1.80MPa(recommend)
Method B:0.45MPa
JIS K7191-1、-2 Edgewise l:120±10mm
b:9.8~15±0.2mm
h:3.0~4.2±0.2mm
Method A:1.80MPa(recommend)
Method B:0.45MPa
ASTM D648 Edgewise l:127mm
b:3~13±0.13mm
h:13±0.13mm
1.82MPa
0.455MPa

Apparatus

Examples of a specimen

Thermoplastic Resin :PP, PC, ABS etc. (In the case that HDT is lower than 250℃)

Search Number 6C004

Download The Technical Note of This Exapmle.

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