2013 Archive

Extruded polystyrene (XPS) is extruded PS. Extruded polystyrene foam consists of closed cells; offers improved surface roughness and higher stiffness and reduced thermal conductivity. The density range is about 28–45 kg/m³. XPS

    Extruded polystyrene foam begins with solid polystyrene crystals. The crystals, along with special additives and a blowing agent, are fed into an extruder. Within the extruder the mixture is combined and melted, under controlled conditions of high temperature and pressure, into a viscous plastic fluid. The hot, thick liquid is then forced in a continuous process through a die. As it emerges from the die it expands to foam, is shaped, cooled, and trimmed to dimension.
Extruded polystyrene has a well established reputation for long-term reliability and superior resistance to the elemental forces of nature: time, water, cold, heat, and pressure.
Extruded polystyrene material is also used in crafts and model building, in particular architectural models. Because of the extrusion manufacturing process, XPS does not require facers to maintain its thermal or physical property performance.XPS Recycling
Water vapour diffusion resistance of XPS is around 80–250 and so makes it more suitable to humid environments than EPS. The superior moisture resistance of extruded polystyrene insulation provides outstanding benefits for most construction and engineering applications.
XPS is mostly used to produce insulation board because it has great heat preservation and insulation property, high crushing resistance, good moisture resistance and rot resistance, etc. and it is light.
Dow Chemical Co produces blue XPS; BASF Corporation produces green XPS, and so on. They are the big producer of XPS in the world.