Extruded Polystyrene Board(Groove XPS board) is made with polystyrene.It's sealed and foamed structure helps to have many advantages, incuding high-resist compression,waterproof,moistureproof,air proof,light weight,anti-corrosion,long service life and low conductivity factor and so on. Technical information Thickness: 6-100mm Width: 600 900mm Length: 900 2400mm Compressive Strength: >=250Kpa Density:35-40kg/m3 Thermal Conductivity: <=0.029 W/(m.k)(25 centi degree) Dimensional stability: Maximum 1.5% Water Absorbability: <=1.00% Moisture Permeability: <=2.0 Superior performance make it fit for a wide range of acoustic and thermal insulating applications, including roofing, wall, freezing plant, floor etc.XPS foam board can also becovered with aluminum or thin cement polymer mortarwith fiberglass mesh.