Six Foot Polyisocyanurate Foam BlocksPolyisocyanurate foam has been a favorite material of pattern builders for years. With this 6 ft. x 4 ft. x 2 ft. block, you can cut, carve, sand, and sculpt nearly any shape without the hassle of gluing numerous sheets together or pouring your own block. Although this foam can be easily CNC machined, it should not be hot wired. Professional results can be achieved by using a variety of hand tools to saw, carve, plane, and smooth out your shape. To