In the ISO 306 standard developed by the International Standards Organization (ISO), test methods for determining the vicat softening temperature (VST) of thermoplastic materials subjected to certain controlled test conditions are defined. In the Vicat test method, a flat-tipped needle is inserted into the sample under a certain load. The temperature reached at a depth of 1 mm is the vicat softening temperature. This temperature value represents the expected softening point when a material is used in a high temperature application.
-belirlenmesi.jpg "ISO 306 Plastics - Thermoplastic Materials - Determination of Vicat Softening Temperature (VST)")
The test methods offered in the mentioned standard are:
These test methods are valid only for thermoplastics, where they give a measure of the temperature at which the thermoplastics begin to soften rapidly.
Briefly, these test methods measure the mechanical properties (in this case, the surface properties) of polymers, their ability to protect at high temperatures. Also known as Vicat needle testing, these methods are becoming increasingly important as plastics continue to replace more traditional materials in all kinds of applications. Vicat tests are performed by slowly raising the temperature of the sample while applying a point load. When the point load enters the material by 1 mm, the test is terminated and the temperature is recorded. These test methods are seen as very useful as a quality control or improvement tool. The result obtained is a measure of the temperature at which thermoplastics begin to soften rapidly.
Other international standards similar to ISO 306 include: ASTM D1525-17 Standard test method for Vicat softening temperature of plastics, ASTM D648-18 Standard test method for deflection temperature of plastics under bending load in edge direction position, and ISO 75-1 Plastics - Determination of deflection temperature under load - Part 1: General test method.
Our organization, among the numerous test, measurement, analysis and evaluation studies it provides for businesses in various sectors, also provides services for the determination of thermoplastic materials, vicat softening temperature (VST) within the scope of ISO 306 standard, with its trained and expert staff and advanced technological equipment.
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