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TPE (TPR) Compression Set

The compression set value is the amount of material that is compressed to a certain shape at a certain temperature and is permanently deformed after a certain period of time.

The commonly used ASTM test method (ASTM D395) requires the material to be deformed (compressed) up to 25% for a certain period of time. Let it recover for 30 minutes before measuring this sample.

23 °C (room temperature)

22 hours, 70 hours, 168 hours (1 week), 1000 hours (42 days).

70 °C

22 hours, 70 hours, 168 hours (1 week), 1000 hours (42 days).

121 °C

22 hours, 70 hours, 168 hours (1 week), 1000 hours (42 days).

150 °C

22 hours, 70 hours, 168 hours (1 week), 1000 hours (42 days).

The resulting test value is the percentage of the material sample that failed to return to its original height. For example, a 40% compression set indicates that the thermoplastic elastomer only recovers 60% of the compressed thickness. A 100% compression set indicates that the thermoplastic elastomer has not recovered at all, that is, it remains in a compressed state.

Compression and permanent deformation are often confused with creep. However, compression set is the amount of deformation that occurs under a constant strain condition, whereas creep is the amount of deformation that occurs under a constant stress condition.

Applicable temperature of TPE (TPR)

The term applicable temperature is used to roughly define the maximum temperature at which a material is suitable for use.

The applicable temperature depends on many factors, including the performance requirements, the length of contact time, the presence or absence of a load, and the structure of the workpiece design.

Some common applicable temperature measurement methods are Vicat softening temperature, heat distortion temperature (HDT), U.S. safety testing laboratory (UL) method, semi-tensile strength, and other proprietary methods, which vary from industry to industry.

Examples of applications that require higher applicable temperatures include automotive, transportation, hydraulic hoses, and mine cables. Examples of applications that do not require a higher applicable temperature include general indoor uses, such as handles, phone jack connections, and toys on personal care products and kitchen utensils.

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