... insulation 4.environmental protection 5.energy conservation exterior wall panel :lengrh: 3800mmwidth:380mmthickness :16mmweight : 3.7kg/ ... -proof, waterproof, fire prevention, sound insulation, heat preservation, low thermal conductivity, beautiful, durable, energy saving, construction convenient, ... old buildings. Product Features :1.cost performance low, the cost a third for aluminum-plastic plate ...