ISO 815-2:2014 specifies two methods for the determination of the compression set characteristics of vulcanized and thermoplastic rubbers at low temperatures.
Method 1 derives from the methodology used in ISO 815-1. Method 2 uses a specified testing device, allowing to measure and record the test piece thickness during recovery. Due to the load applied during recovery in method 2, no correlation can be established between the results given by both methods.