Coosa Composites Bluewater 26 Panel, 5/8" x 2' x 4'. Typically used as a semi-structural component this premier panel is a high density, closed-cell polyurethane foam reinforced with woven roving and continuous strand fiberglass that can be utilized in multiple applications. Ultimate high strength-to- weight ratio adds stiffness for demanding applications where structural integrity or greater span lengths are appropriate. Does not attract mold or fungus and offers a very low water absorption of 1.5 percent or less. Density is 26 pounds per cubic foot and is 30 percent lighter than plywood.