... Corp., we are China largest state-owned company for building materials.ISO9001 ISO14001HDPE pipe size:dn20~dn630pressure:0 ... Black or others on request Connection: Socket-fusion jointed, butt-fusion jointed , electron-fusion jointed, flange jointedStandard: ISO4427, ISO4437, GB/ ... many chemical mediums, or electron chemical corrosion. except for few strong oxidants3.High strength, good performance to ...