ISO 306:2013 specifies four methods for the determination of the Vicat softening temperature (VST) of thermoplastic materials: method A50 using a force of 10 N and a heating rate of 50 K/h; method B50 using a force of 50 N and a heating rate of 50 K/h; method A120 using a force of 10 N and a heating rate of 120 K/h; method B120 using a force of 50 N and a heating rate of 120 K/h.