Heat Resistance

Heat resistance is a measure of the thermal endurance of plastic materials. It describes the ability of a test specimen to retain its shape up to a specified temperature under a specified load or to deform only within specified limits at a specified test temperature.¹

The heat resistance can be determined according to various standardised test methods such as Vicat and the Heat distortion temperature.

At UL we offer the following heat resistance tests.


Heat resistance test methodsStandards
Vicat ISO 306
ASTM D1525
Heat distortion temperature ISO 75-2
ISO 75-3
JIS K7207




1 Grellmann, W., Seidler, S. (Editors): Kunststoffprüfung
  Carl Hanser Verlag, Munich/Vienna (2011)
  2nd Edition, pp. 591/592, (ISBN 978-446-42722-8)