This International Standard specifies a method for testing the ring flexibility of a thermoplastics pipe having a circular cross-section.The method enables determination of the deflection, and necessary force, at which physical damage, if any, occurs within the specified diametric deflection.
DS/EN ISO 13968:2008 history
2008DS/EN ISO 13968:2008 Plastics piping and ducting systems - Thermoplastics pipes - Determination of ring flexibility