This video shows how low temperature retraction (TR) is determined according to ISO 2921 and ASTM D1329.

The test measures the retraction of stretched test pieces, which are cooled to -70°C and then the temperature is increased by 1 °C/ min.


Watch Elastocon's video about the TR test according to ISO 2921


Read more about Elastocon's TR tester ET 01‑II here