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ISO 8773:2006 specifies the requirements for polypropylene (PP) pipes, fittings and piping systems intended for use for non-pressure underground drainage and sewerage for the conveyance of soil and waste discharge of domestic and industrial origin, as well as surface water.

It covers buried pipework, as well as piping systems buried within the building structure.

In the case of industrial discharge, it is necessary that the chemical and temperature resistance be taken into account, but this will need to be done separately.

ISO 8773:2006 is applicable to PP pipes with or without an integral socket and to jointing by means of push fit joints with sealing rings or butt-fused joints.

It covers PP materials with normal E moduli and with higher E moduli, designated as HM (higher modulus), and gives a range of nominal sizes and pipe series, as well as recommendations concerning colours.

ISO 8773:2006 also specifies the test parameters for the test methods referred to therein.