ISO 75 and ISO 306: HDT and VST Tests on High Temperature Polymers

Name: ISO 75 and ISO 306: HDT and VST Tests on High Temperature Polymers
Brand: Instron
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Traditionally silicone oil has been the most popular medium for performing heat deflection temperature (HDT) and vicat softening temperature (VST) tests on polymers. The test principle and procedure are simple, and although silicone oil based test systems are very well established, they can be used safely only up to a maximum temperature of 280°C. High temperature polymers like Polyether Ether ketone (PEEK) and Polyetherimide (PEI) have an increasing demand in the polymer industry due to their higher mechanical and thermal properties. An alternative medium is required to test these high temperature polymers because they have HDTs and VSTs higher than the temperature at which silicone oil can be used. We used a CEAST HV500, which utilizes an aluminum oxide fluidized bath, to perform a range of HDT and VST tests for both high and low temperature applications according to ISO 75-1 & 2 and ISO 306 Method B,

Applicable Standards

ISO 306
Plastics — Thermoplastic materials — Determination of Vicat softening temperature (VST)
ISO 75-1
Plastics — Determination of temperature of deflection under load Part 1: General test method
ISO 75
Plastics — Determination of temperature of deflection under load — Part 3: High-strength thermosetting laminates and long-fibre-reinforced plastics

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