Floatation Block Benefits Foam-Control EPS is extremely buoyant. Foam-Control EPS Flotation Blocks are made from highly stable expanded polystyrene. With proper care and protection, Foam-Control EPS Flotation Blocks will not corrode, decay or sink when punctured, and will give years of flotation service. Sizes and Shapes Foam-Control EPS Flotation Blocks can be made in a variety of sizes and shapes. Coatings Protective coatings/coverings must be used to encapsulate the Foam-Control EPS to ensure optimum service life and meet many of today’s marine design standards.