Extruded Polystyrene Foam Properties

Performance properties of extruded polystyrene foam xps insulation in general the physical properties of xps products are best characterized by using the material standard for rigid cellular polystyrene foams.

Extruded polystyrene foam properties.

R value is a measure of a material s resistance to heat transfer. Although both types of insulation are comprised of polystyrene the two types of manufacturing processes produce finished products with very different performance properties. Unlike expanded polystyrene eps styrofoam is manufactured via a continuous extrusion process. Grey polystyrene foam incorporating graphite has superior insulation properties.

Foamular extruded polystyrene xps insulation astm c578 types and physical properties this table outlines the basic physical property requirements of astm c5781 and foamular xps insulation compliance. The thermal conductivity of expanded polystyrene foam of density 20 kg m 3 is 0 035 0 037 w m k at 10 c. Thermal efficiency insulating power the thermal efficiency of an insulating material is expressed as r value. There are two types of polystyrene foam best suited for processing with the hot wire foam cutters and hot knife cutters.

Extruded polystyrene xps foam and expanded polystyrene eps foam. Extruded polystyrene xps rigid foam insulation owens corning foamular 250 extruded polystyrene xps rigid foam insulation is a closed cell highly moisture resistant rigid foam board well suited to meet the needs for a wide variety of residential and commercial construction applications. Celfort and foamular extruded polystyrene insulation boardsare suitable for all types of high strength construction applications the boards are lightweight durable and impact resistant which helps to reduce job site damage foam insulation can be scored and fabricated easily with common hand tools. Astm c578 standard specification for rigid cellular polystyrene thermal insulation addresses the physical properties and performance characteristics of eps foam as it relates to thermal insulation in construction applications.

Astm standard c 578 08b. The resulting foam board is then trimmed to the final product dimensions. Ps foams also exhibit good damping properties therefore it is used widely in packaging. The products are organized left to right in ascending compressive strength.

Because the foam board is extruded rather than poured into molds like eps foam board the thickness of the xps product is limited.