Foam Board - 1/2 - 30X40 - White - Foam Board is an almost weightless board made of a polystyrene foam core. Foam Board comes in black or white, laminated on both sides of the foam core with a coated paper stock. Foam Board is great for mounting posters, presentations, backing frames, table top displays, design model construction, and more. Foamboard cuts easily with a mat cutter or Xacto type utility knife score and fold for three-dimensional work. Standard foamboard is 3/16 inch (5 mm) thick, also available in 1/8 inch, and 1/2 inch.