The D73-500-40 is a Kubara lamina, an industrial grade cardboard material which is used for packaging and other demanding applications. It is a five-ply cardboard material which is constructed from corrugated medium and kraft paper liners and a glass saturated resin. The product is 40 inches wide and .050 inch thick, or 500 points, and provides stunning performance characteristics such as outstanding strength, rigidity, resistance to tearing, soil resistance, and water resistance. The sheet has a smooth surface, with homogeneous grain on both sides. It is an ideal choice for a wide range of applications, including displays, mailers, packaging boxes, and any other demanding application.