Specification :

Composite drainage board(called three-dimensional geo-drainage board,three-dimensional composite drainage board,tunnel drainage board) is a new type drainage material with the function of draining and waterproof,having high rate of void and high pressure-proof strength.It owns three-dimensional geo-core.One side is composite geotextile,another composite two geotextiles and one geomembrane,Ownning “anti-filtering—draining—ventin—water-resisting--protecting� function.