XPS / extruded polystyrene foam insulation is a rigid polystyrene as raw materials with other raw materials and fire retardant, by heating the mixture injected into the foam, and then extruded rigid board foam plastic board . Chemical name is extruded polystyrene board (XPS). XPS board has a perfect closed-cell cellular structure, this structure allows XPS board in the water absorption, thermal conductivity and vapor permeability coefficient are all lower than other types of plate-like insulation material, it has a high compressive strength, lightweight, airtight, corrosion-resistant, non-degradable and so on. XPS board in the United States and Europe is a very common heat insulation material, especially for the use of inverted roof insulation process (up-set down) of the roof insulation system, cold dynamic library, internal and external wall insulation, home decoration and so on. The product is suitable for both roof insulation insulation, ease of construction, the total cost, service life than conventional perlite has more advantages for the new environmentally friendly energy-saving materials, is the material of choice for building decoration industry.