High Density Overlay (HDO) Extremely durable panel with high-density overlay—ideal for concrete forming and industrial surfaces. Categories Concrete forming plywood, Domestic, Exterior, Imported Substrate Veneer Core Veneer Species Fir Thickness 1/2" to 3/4" Sizes 4’x8’, 4'x10', 5'x10' Availability Stocked Item Learn More Request Quote Similar Products MDO Explore