Vicat Softening Point & Heat Deflection Temperature – Common Plastic Test Methods
Vicat Softening Temperature Applicable standards: ASTM D 1525, ISO 306, DIN 53460 The test for Vicat softening temperature mainly determines the temperature at which a material softens rapidly. A plastic specimen is immersed in a liquid heat-transfer medium. Under a specified load and constant linear heating rate, the temperature at which a 1 mm² flat-tipped indenter penetrates 1 mm into the specimen is defined as the Vicat softening temperature (VST). ISO 306 specifies two load grades:Grade A: 10 N load Grade B: 50 [...]