本文件规定了用于制造埋地或地上应用的压力管道和配件（干线和服务管道）的聚乙烯（PE）化合物的一般方面，旨在输送: -供人饮用的水； -处理前的原水； -压力下的排水和污水处理； -真空下水道系统； -其他用途的水。 本文件还规定了本文件中提及的试验方法的试验参数和要求。 与ISO 4427系列的其他部分一起，本文件适用于PE管道和配件、它们的接头以及与PE和其他材料制成的部件的接头，预期在以下条件下使用: a)最大允许工作压力(PFA)高达并包括25巴[1]；b)20℃的操作温度作为参考温度。 注1对于其他工作温度，指南见附录A。 ISO 4427系列涵盖了一系列最大允许工作压力，并给出了有关颜色的要求。 注2买方或指定方有责任从这些方面做出适当的选择，同时考虑到他们的特殊要求和安装惯例或规范。 [1]1巴=0.1 MPa=105巴；1MPa=1N/mm2。

This document specifies the general aspects of polyethylene (PE) compounds for the manufacture of pressure pipes and fittings (mains and service pipes) for buried or above ground applications, intended for the conveyance of: — water for human consumption; — raw water prior to treatment; — drainage and sewerage under pressure; — vacuum sewer systems; — water for other purposes. This document also specifies the test parameters and requirements for the test methods referred to in this document. In conjunction with other parts of the ISO 4427 series, this document is applicable to PE pipes and fittings, their joints and to joints with components made of PE and other materials, intended to be used under the following conditions: a) a maximum allowable operating pressure (PFA) up to and including 25 bar[1]; b) an operating temperature of 20 °C as the reference temperature. NOTE 1 For other operating temperatures, guidance is given in Annex A. The ISO 4427 series covers a range of maximum allowable operating pressures and gives requirements concerning colours. NOTE 2 It is the responsibility of the purchaser or specifier to make the appropriate selections from these aspects, taking into account their particular requirements and installation practices or codes. [1] 1 bar = 0,1 MPa = 10⁵ Pa; 1 MPa = 1 N/mm².