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ISO 306:2022

Plastics - Thermoplastic materials - Determination of Vicat softening temperature (VST)

This document 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.

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International Organization for Standardization [iso]

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