Aluminum alloy door and window is a new model to be promoted recently. It’s different from ordinary aluminum doors and windows. At the design of material, it adds four pieces of PVC insulation to have the excellent effect of keep warm, then to achieve the aim of saving energy. In the selection of seal strip, ordinary aluminum doors and windows often choose the general PVC seal strip, which will drop within one or two years. However, aluminum alloy doors and windows use the seal trips of EPDM Rubber and Thermoplastic EPDM Rubber(santoprene), in order to guarantee their seal performance and life.