Shanghai kuanruo industrial development co,ltd. ,as a professional manufacturer ,has adopted the most advanced automatic equipment ,by the three- layer co-extrusion technology to produce the HDPE anti-seepage membrane .varying in thickness from 0.25mm to 3.0mm , smooth / rough surface,4m-12m in width .the standard of the quantity strictly according to the GRI of America ,Germany industrial standard , GB/T17643-1998 of china ....