EVS-EN ISO 2507-1:2017

This part of ISO 2507 specifies a general method for determining the Vicat softening temperature of
thermoplastics pipes and fittings. It includes the adaptation of method B of ISO 306: 1994, using a force
of 50 N.
This method is applicable only to thermoplastics materials for which it is possible to measure the temperature at which their rate of softening becomes rapid.
It is not applicable to crystalline or semi-crystalline polymers.
The method specified is based on determining the temperature at which a standard indenter, under a force of 50 N ± 1 N, penetrates 1 mm into the surface of a test piece cut from the wall of a pipe or fitting while the temperature is raised at a constant rate.  Is based on ISO 306:1994 which, however, applies to materials in the form of sheets.