Wednesday 4 August 2021

Rule of Thumb in Plastics Design: Selection of Maximum Short-Term Operating Temperature

 Hello and welcome to a new rule of thumb blog post. Today we discuss how to select the maximum short-term operating temperature for your plastic part.

In general, it is acceptable to use a temperature which is between 7°C to 12°C below the Heat Deflection Temperature (HDT) of the finished resin as the maximum short-term operating temperature.

HDT tells us the short-term heat resistance of the selected material, which shows a certain amount of deformation under the load of 0.455 MPa or 1.82 MPa (tensile bar). Therefore, using the HDT minus some degrees in temperature is a good practical way to estimate the maximum short-term use temperature.

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[1] Designing with Plastics, A practical guide for engineers, Design news, 11.20.06

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