标准摘要
[中文适用范围]： 本国际标准规定了一种测试具有圆形截面的热塑性塑料管环柔韧性的方法。该方法能够确定在规定的直径变形范围内发生物理损伤（如有）时的变形量和所需力。 [外文原描述]： ISO 13968:2008 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.
英文名称Plastics piping and ducting systems — Thermoplastics pipes — Determination of ring flexibility