This document specifies the characteristics of the fitness for purpose of pipes and/or fittings assemblies made from polyethylene (PE) 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, and water for other purposes.

This document also specifies the test parameters for the test methods referred to in this document.

In conjunction with the other parts of the ISO 4427 series, this document is applicable to PE pipes, fittings, their joints and to joints with components of PE and other materials, intended to be used under the following conditions:

1. a)

   a maximum allowable operating pressure (PFA) up to and including 25 bar ¹

   ¹

   1 bar = 0,1 MPa = 10 ⁵  Pa; 1 MPa = 1 N/mm ².

   ;
   
   
2. b)

   an operating temperature of 20  °C as the reference temperature.

The ISO 4427 series covers a range of maximum allowable operating pressures and gives requirements concerning colours.