Material: polystyrene thickness:2-40mm. Packaging detail: wooden panel or according to the customers' request plastic extruded board : Has a perfect closed-pore alveolate structure, its density, bibulous rate, thermal conductivity and steam permeability coefficient were lower than other types of board heat preservasion materials. feature: Good strength, qualitative light, airtight, corrosion resistance, anti-aging, low price Application: 1. Cold storage, metope, ground, and other field. 2. Roofing heat preservation 3. The wall heat preservation