Project No. 26-12-20 to revise notch depth specification - Rationale: No tolerance on the notch depth is currently provided within the standard and there is currently no requirement for verifying the notch depth. As this is a pressure-based test, the test stress on the sample will vary with notch depth with deeper notches representing a more aggressive test. An excessively deep or shallow notch may provide a false indication of material performance resulting in a false pass or fail result. Addition of a tolerance and verification of the notch depth to the standard will reduce the potential for false pass or fail results.
Keywordscrosslinked polyethylene; hydrostatic stress; PEX; PPI; pipe; pressure; tubing;