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CPVC Pipes & Fittings{short description of image} Don't Be Mislead
Expansion - Contraction Phenomenon - Calculations
Technical Report
Test Method for visual Differentiation
Between CPVC Pipes and PVC Pipes

Scope
CPVC pipes are used fo the transport of drinking water. This application requires that the pipes under normal service conditions can withstand high internal pressures of water continuously at hot temperatures for 50 years.

For this application, PVC pipes are not approved by any regulatory organism, because they would fail after very short times under such severe service conditions.

This test method describes a simple way to determine with a simple apparatus if a pipe is made only of CPVC or contains a majority of PVC.

Background
The thermal resistance of CPVC is much higher than for PVC. In terms of softening point, CPVC pipes are stiff up to 110°C, whereas PVC pipes will become softer and softer above 80°C. Pipes based on a blend of PVC and CPVC will show a behavior halfway between these two resins: the higher the amount of PVC, the softening temperature of the pipe. At a temperature of 100°C (boiling point of water), the pipes containing a majority of PVC will prove soft, whereas the CPVC pipes will be stiff.

Apparatus
  • Transparent glass container
  • Heating plaque
  • Thermometer
  • Chronometer

Safety information
No specific hazard

Photo1: Test appartus

Procedure
  • sample a pipe (½ inch or ¾ inch Schedule 80)
  • cut a test specimen from the pipe (approx. 50mm long)
  • heat the water up to its boiling point (Photo 1)
  • control with thermometer that the water temperature is higher than 98°C
  • condition the test specimen in the boiling water for 15 minutes
  • take the specimen off the bath and put it on a flat table
  • squeeze the specimen manually with a stuff, round-shaped pipe (Photo 2)
The squeeze loading must be applied to the test specimen immediately after it is taken from the bath, so that it does not cool down significantly.

Interpretation of the Observations

Photo 2:The pipe specimen is squeezed Photo 3: Pipes containing >50% PVC flatten

Note
This test method is also applicable to fittings (½ inch or ¾ inch Schedule 80): the injected part is entirely immersed in the water bath for 15 minutes and squeezed on one of its sockets.

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