This Technical Specification gives guidance for the assessment of conformity of materials, products, joints and assemblies in accordance with the applicable part(s) of EN 14758 intended to be included in the manufacturer’s quality plan as part of the quality management system and for the establishment of certification procedures. NOTE In order to help the reader, a basic test matrix is given in Annex A. In conjunction with EN 14758-1 this document is applicable to solid wall piping systems made of polypropylene modified with mineral(s) (PP-MD) intended to be used for: — non-pressure underground drainage and sewerage outside the building structure (application area code “U”); and — non-pressure underground drainage and sewerage for both buried in ground within the building structure (application area code “D”) and outside the building structure. This is reflected in the marking of products by “U” and “UD”.