This Standard is included in DIN Handbook 171. Applies to laminated joints (Form L) made of glass fibre reinforced plastics (GFK) based on unsaturated polyester resins (UP resin) for Types A, B, D or E pipes, used for joining pipes in accordance with DIN 16965 Part 1, Part 2, Part 4 and Part 5 and fittings in accordance with DIN 16966 Part 2, Part 4 and Part 5. The laminated joints must comply with DIN 16966 Part 7.