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VST is the temperature when a sample of engineering plastics, general-purpose plastics and other polymers are pressed into a depth of 1mm by a 1mm2 indenter in a liquid heat transfer medium under a certain load and a certain constant rate of temperature rise. This temperature reflects the desired softening point when a material is used in a heating device.
Test standard:
GB/T 1633-2000 (ISO 306:2013) Determination of Vicat Softening Temperature (VST) of Thermoplastics;
ASTM D1525-2017e1 Standard Test Method for Vicat Softening Temperature of Plastics
Test equipment and instruments:
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