... 2.fireproofing,waterproof 3.sound insulation 4.environmental protection 5.energy conservation exterior wall panel :lengrh: 3800mmwidth:380mmthickness ... , shockproof ,moisture-proof, waterproof, fire prevention, sound insulation, heat preservation, low thermal conductivity, beautiful, durable ... life more than 50 years5. Heat preservation, sound insulation, equivalent to 4 cm thickness polystyrene ...