Aluminium-plastic pipe is macro composite pipe of five layers. The inside layer is made of high-density polyethylene(HDPE),overlapped welded by an aluminium layer, then covered by outside high-density polyethylence(HDPE) layer.All layers are extruded in one step.Our pipes use special HDPE which is hygienic, toxic-free and smooth. The middle aluminium layer is 100% oxygen tight. This structure provides our pipes the advantage of both metal and plastic while avoiding their weaknesses.