vicat softening temperature

thermal analysis – vicat softening temperature

Heat distortion Temperature Testing of Plastics

vicat softening temperature

The vicat softening temperature (VSP) test is a standard test (ASTM D1525 and ISO 306) used to assess the temperature at which a needle of specified dimensions penetrates into plastic specimen a specified distance under a given load. Compared with the heat distortion test (HDT), the vicat test reveals the temperature at which the specimen loses its “stability-form” and softens, while HDT test measures the temperature at which the specimen loses its “load-bearing” capability. VSP characteristic of plastic samples is an important tool for material selection process as well as for product design and manufacture.

During VSP test, a flat-ended needle loaded with a specified mass is placed in direct contact with a test specimen, which is immersed in a heat transfer oil bath. The load applied to the specimen could be either 10 N or 50 N. Subsequently the specimen and needle are heated at either 50 oC/h or 100 oC/h. Finally the temperature at which the needle penetrated to a depth of 1 mm is recorded and it is the Vicat softening point.

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Some members of impact’s team have over 30 years of polymer experience, with over 120 years combined, and are internationally regarded as product experts including sitting on various CEN committees and being a notified body for construction products (Note because of our notified body status we cannot undertake consultancy on oil storage tanks), we can often identify potential sources of weakness in products without even undertaken testing using our experience.

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