JIS K6814-2008《热塑管–热还原试验方法》

This Standard specifies the method for determining the thermal longitudinal
reversion of thermoplastics pipes (hereafter referred to as "pipes") by heating either
in high temperature liquid or in high temperature air. In case of dispute, the method
immersing in high temperature liquid shall be used as the reference.
This Standard is applicable only to thermoplastic pipes with smooth internal and
external walls of constant cross section, and not applicable to non-smooth structured-
wall thermoplastic pipes.
NOTE 1 Pipes with non-smooth structured-wall are such as profile wall pipes
and corrugated pipes.
NOTE 2 The International Standard corresponding to this Standard is as
follows.
ISO 2505 : 2005 Thermoplastics pipes --Longitudinal reversion --
Test method and parameters (MOD)
In addition, symbols which denote the degree of correspondence