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DIN EN ISO 306:2023
Plastics - Thermoplastic materials - Determination of Vicat softening temperature (VST) (ISO 306:2022); German version EN ISO 306:2022
This International Standard 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 °C/h — Method B50 using a force of 50 N and a heating rate of 50 °C/h — Method A120 using a force of 10 N and a heating rate of 120 °C/h — Method B120 using a force of 50 N and a heating rate of 120 °C/h The methods specified are applicable only to thermoplastics, for which they give a measure of the temperature at which the thermoplastics start to soften rapidly.
Deutsches Institut für Normung [din]