Henco multilayer pipes are permitted for gas pipelines, in countries where there is a Henco gas mark and certificates. In addition, the pipes and casing should have a yellow marking or be coloured yellow. The Henco multilayer pipe offers all the advantages of metal and plastic:Longitudinally seamlessly welded aluminium inner core of the pipe100 % oxygen-tightLow linear expansion coefficient, comparable to metalCompletely corrosion-resistant, also against chemical and electrochemical influencesSound-absorbing, characteristic of a pipe made of plasticInner and outer pipe made of electron-beam cross-linked polyethyleneGreat resistance to pressure and temperatureSmooth surface little pressure lossAs light as plastic pipeFlexible, easy to bend. The pipe retains its bent shape even at low temperatures