General standard: Size: 2000/4000*1200(L*W) Compressive Strength: 450kpa Thickness: 20mm(also provide 25mm and 30mm) Water Absorption: 2.90% Alum.Foil Thickness: 0.08mm(both sides) Dimensional Stability: 0.53%(70+/-2 Density: 71kg/m3 Oxygen Index: 57.80% Fire Retardant: A Smoke Density: 2 Thermal Conductivity: 0.018W/m.k Smoke Toxicity: 25. (Average Temperature 25+/-2). Advantage : Lower heat conductivity, higher thermal efficiency High Fire-Protection rating Low density, light weight Easy Installation Foamed with CFC free materials, environment protective Hermetic seal ensures little air leakage With aluminum foil reinforced on both side, its corrosion protective, hygiene, and has a beautiful appearance Foamed with closed-cell structure, its water-proof and sound-insulated. No protrudent flange on the connections, it can save a lot of building . 1*40HQ.