scope:

This Standard specifies the double wall polyethylene pipes to be used for water supply, which have a maximum operating pressure up to and including 0.75 MPa (hereafter referred to as pipes).

NOTE The International Standards corresponding to this Standard and the symbol of degree of correspondence are as follows.

ISO 4427-1:2007 Plastics piping systems-Polyethylene (PE) pipes and fittings for water supply-Part 1: General, Amendment 1:2015

ISO 4427-2:2007 Plastics piping systems-Polyethylene (PE) pipes and fittings for water supply-Part 2: Pipes, Amendment 1:2014 (overall evaluation: MOD)

In addition, symbols which denote the degree of correspondence in the contents between the relevant International Standards and JIS are IDT (identical), MOD (modified), and NEQ (not equivalent) according to ISO/IEC Guide 21-1.