標準號：ISO 2505-2005
中文標準名稱：熱塑性管.縱向回縮.試驗方法和參數
英文標準名稱：Thermoplastics pipes - Longitudinal reversion - Test method and parameters
標準類型：G33
發布日期：1999/12/31 12:00:00
實施日期：1999/12/31 12:00:00
中國標準分類號：G33
國際標準分類號：23.040.20
適用范圍：This International Standard specifies a method for determining the longitudinal reversion of thermoplastics pipes, to be carried out in either a liquid or in air. In case of dispute, heated liquid is used as the reference. This International Standard is applicable to all thermoplastics pipes with smooth internal and external walls of constant cross-section. It is not applicable to non-smooth structured-wall thermoplastics pipes. The parameters appropriate to the pipe material and recommendations for the maximum levels of reversion as a function of the pipe material are given in Annex A. NOTE Measurement of longitudinal reversion is not considered relevant for pipe wall thickness greater than 16 mm.