Expanded Polystyrene (EPS) is a lightweight, closed cell, rigid, plastic foam insulation material produced from solid beads of polystyrene. The EPS beads are expanded and then molded into large EPS Blocks then used in walls, roofs, floors, attics, crawl spaces, EIFS, stucco, and architectural shapes. EPS offers design flexibility, high R-Values for thermal insulation, superior dimensional stability, and resistance to moisture absorption and physical degradation. EPS is the ideal, cost-effective and easy-to-use material in all types of buildings, from houses and offices to factories and schools. StarRfoam meets or exceeds the requirements of ASTM C578, Standard Specification for Rigid, Cellular Polystyrene Thermal Insulation.