PVC Pipe Heat Reversion Testing and Associated Risks
Heat reversion testing evaluates the dimensional stability of PVC pipes under high temperature exposure. Per European and ISO standards, a pipe sample is heated to 150°C and the length shrinkage must not exceed 5%. This assesses the degree of heat reversion, which is the pipe’s length shrinkage caused by thermal exposure. Excessive reversion commonly results from overstretching the free extrudate during co-extrusion or extrusion processing.
Associated Risks of Excessive Heat Reversion
Excessive heat reversion poses risks to joint integrity, particularly in applications involving hot water discharge (e.g., dishwasher drainage or industrial wastewater). Prolonged shrinkage can cause spigot retraction from rubber ring sealed sockets, leading to leakage or joint failure.
FAQ Section
What is the standard requirement for heat reversion in PVC pipes?
According to European and ISO standards, length shrinkage at 150°C must not exceed 5%.
Why is heat reversion testing important?
It prevents long-term joint failure by ensuring that pipes do not shrink excessively under thermal stress, which can cause spigot retraction and leakage.
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Navdeep Singh Chawla
