Longitudinal Reversion Tester (PF Heat Reversion Test Apparatus) for testing Pipes made from Unplasticized Polyvinyl Chloride Polymer ( Thermoplastic material). 

The longitudinal shrinkage rate of the PE water supply pipe is determined by placing a specimen of specified length in a heating medium at a given temperature for a certain period of time, and measuring the distance between the marked lines before and after heating, expressed as the percentage change in length relative to the original length. 

Sample preparation

Sampling: Cut at least 200mm of pipe section from the pipe as a sample.

Marking: Use a marking tool to evenly mark two circular markings on the sample that are 100mm apart, ensuring that one marking is at least 10mm away from the end. www.unitedtest.com 

Pre treatment: The sample needs to be placed in an environment of (23 ± 2) ℃ for at least 2 hours to reach temperature equilibrium.

Testing procedure

Heating treatment: Place the sample in an oven set at 150 ℃ and maintain it for sufficient time (usually 1 hour) to fully heat the sample.

Cooling: After heating, remove the sample and let it cool naturally to room temperature (23 ± 2) ℃, or follow specific standard requirements.  

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