Attach the specimen to a mandrel of diameter 20mm. Attach a weight of 0.5 kg to the other end of the specimen. Cool
the assembled specimen and mandrel to -40 +/- 3 °C (-25 +/- 3 °C if the tape is made of polyvinyl chloride [PVC]) for a
period of four hours. While still chilled and in the chamber, wrap the specimen at least two times around the mandrel.