both have their own characteristics. Plastic-steel is a door and window material extruded with PVC-U as the main component, which is also a building material plastic. The full name of steel-plastic extrusion is steel-plastic extrusion, which is a method of micro-foaming with PVC crust and extrusion molding with special-shaped steel lining, and then combined with high-strength steel corner fittings to form door and window products. This high-tech patented product has successfully overcome the problem that ordinary plastic steel doors and windows have wind resistance and cannot be used in high-rise buildings. At the same time, the advantages of the two kinds of plastic steel materials are brought into play-the excellent heat insulation and heat preservation of plastic micro-foaming technology and the high strength of special-shaped steel. Steel-plastic materials also have the advantages of no deformation, long service life and environmental protection.