Shop for Fome-Cor® Heat-Activated Board. Fome-Cor® Heat-Activated is comprised of extruded polystyrene foam with clay-coated paper facers with one side covered with heat-activated adhesive. Standard sizes available. Fome-Cor® Heat-Activated is sold in cartons of 25 sheets. Stocked materials typically ship in 2-5 business days. Can’t find what you need? Get a quote.