This document specifies the equipment and procedures for fusion jointing of polyethylene (PE) pipes and fittings. It covers the following pipe constructions commonly found in the UK:
- Single wall PE pipes (either PE80 or PE100) identifiable as being made from a single material in either light blue, dark blue or black through the full pipe wall.
- PE pipes with co-extruded layers where the pipe may comprise two or more layers of compatible PE materials, usually 2 layers with a black inner and a coloured thin outer layer.
- PE pipes with a removable outer layer that has to be peeled from the pipe before it is butt or electrofusion jointed.
- PE pipes with an aluminium barrier layer conforming to WIS 4-32-19, Type-A style, where the manufacturer permits butt fusion and/or electrofusion jointing of the system.
NOTE: PE80 in this context refers to pipes and fittings made from resin with a density in the range 930 kg/m3 to 940 kg/m3. No other pipes classed as PE80 are covered by this specification.
One or more ‘Common Editorial Caveats’ apply – see ‘WIS & IGN Library / Navigation & Caveats’ for details.
On 5 November 2021 the WUK Standards Board accepted an offer by the British Plastics Federation Pipes Group to lead a review group drafting an amendment that would recognise an improvement in test configuration for the peel decohesion test which had been found to produce reliable test data.
After 3-months public consultation of the resulting draft Amendment 1 to WIS 4-32-08 Issue 4 was published on 28/8/23.