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WIS 4-35-01 Issue 2 Specification for thermoplastics structured wall pipes – supplementary test requirements

This WIS specifies the materials, performance and test requirements for thermoplastics structured wall pipe and joints having a smooth bore for gravity sewers in nominal sizes of 150 to 900.

It covers pipes jointed using separate moulded or formed couplers, formed integral sockets and factory fitted moulded couplers forming sockets which are an integral part of the supplied pipe.


One or more ‘Common Editorial Caveats’ apply – see ‘WIS & IGN Library / Navigation & Caveats’ for details.

The WIS holds tests and requirements not included in EN 13476 but required by UK Water Industry.

Following liaison with the British Plastics Federation Pipes Group (Autumn 2021) the Board believes the document remains current.

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