3 PrincipleA test piece consisting of a PVC-U pipe mounted into a PVC-U socket is exposed within a specified temperature range to two specified negative internal pressures for a specified test period, while the pipe is being subjected to an angular deflection in the socket and to deformation. During the test the test piece is … Continue reading ISO 13844 – Elastomeric-Sealing-Ring-Type Socket Joints of Unplasticized Poly(vinyl chloride)(PVC-U) for Use with PVC-U pipes —Test Method for Leaktightness Undernegative Pressure – Testing Equipment