Luyang UPVC doors utilize polyvinyl chloride (ПОЛИВИНИЛХЛОРИД) as the primary raw material, strategically blended with high-temperature-resistant and other auxiliary materials, resulting in excellent weather resistance and corrosion resistance. Manufactured according to specific design requirements and relevant standards, the profile cavity is filled with lining steel (typically 1.25mm galvanized cold-rolled steel sheet) and then cut, welded, and assembled using specialized equipment. …