DVGW CERT publishes the Certification Scheme ZP 8490 “Polyethylene multilayer pipes according to ISO 21004 for water supply”. ZP 8490 covers the certification of multilayer M pipes (e.g. with an aluminium layer) or multilayer P pipes (with an EVOH-layer). The stress-bearing layers of pipes are made of PE, PE-RT or PEX. Applications with reference to ZP 8490 and ISO 21004 can be submitted immediately.