日皮网站免费,日皮的视频黄色,男女日皮视频,日皮软件免费下载

High polymer coated pipe using process of spray or spray + extrude one or multi-layer PE, EP on HFW, SAWH, SAWL, SMLS pipe surface after internal and external sandblasted or shot blasting pretreatment and MF heating etc.

Main usage: oil and natural gas transportation pipeline project、underground of urban gas steel pipeline、urban water supply project.