Plastics pipes and fittings for non-pressure applications – Utilisation of non-virgin PVC-U, PP and PE materials; German version CEN/TS 14541:2007
standard by Deutsches Institut Fur Normung E.V. (German National Standard), 04/01/2007

Plastics pipes and fittings – Characteristics for utilisation of non-virgin PVC-U, PP and PE materials; German version CEN/TS 14541:2013
standard by Deutsches Institut Fur Normung E.V. (German National Standard), 07/01/2013