Precision Board High Density Urethane (HDU) can be used for applications including dimensional signage, modeling, architecture, and industrial tooling. HDU is a “closed cell” rigid polyurethane product that works well for hand-carving as well as CNC-machining. Precision Board is available in a wide range of sheet sizes and densities and can be cut or bonded into a variety of shapes for final machining or shaping.