Plastic steel doors and windows are manufactured using polyvinyl chloride (UPVC) as the primary material, combined with specific amounts of stabilizers, pigments, fillers, and UV absorbers. After extrusion molding, the profiles are cut, welded, or fastened together to form the frame of the door or window. These structures are then fitted with sealing strips, sash covers, and hardware components. To enhance structural rigidity, especially in longer profiles, a steel reinforcement bar is often inserted into the hollow cavities of the UPVC sections. This combination of materials gives the product its name—plastic steel doors and windows. Known for their durability, energy efficiency, and low maintenance, these products have become a popular choice in modern construction, offering an excellent alternative to traditional aluminum or wooden frames.

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