Plastics - Thermoplastic materials - Determination of Vicat softening temperature (VST) (ISO 306:2004)
ISO 306:2004 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/ hMethod B50 using a force of 50 N and a heating rate of 50 °C/ hMethod A120 using a force of 10 N and a heating rate of 120 °C/ hMethod 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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