Corrugated fiberboard or corrugated cardboard is a type of packaging material consisting of a fluted corrugated sheet and one or two flat linerboards. It is made on "flute lamination machines" or "corrugators" and is used for making corrugated boxes. Corrugations are the undulations present in corrugated metal pipes (CMP) and structural steel plate pipes (SSP). As a Culvert Material, corrugations are added to culverts to add stiffness and increase structural strength
