塑钢门窗是一种新型化学建筑材料，它是继木、钢、铝等门窗之后在国际上广泛应用的新一代建材，已被国家建设部指定为绿色节能产品。塑钢门窗在西方发达国家已有 40多年的历史，使用率已在 70％以上，个别国家和地区高达 95％，在我国市场用量亦呈大幅上升的良好趋势。早在多年 Plastic-steel doors and windows are a new type of chemical building material. It is a new generation of building materials widely used in the world after wood, steel, aluminum and other doors and windows. It has been designated as a green energy-saving product by the Ministry of Construction. Plastic-steel doors and windows have been in the western developed countries for more than 40 years. The utilization rate has been over 70%, and individual countries and regions are as high as 95%. In China, the market usage has also shown a significant increase. As early as many years