Xiamen KDSBuilding’s PVC/UPVC sliding windows represent a perfect blend of modern aesthetics, energy efficiency, and durability, making them an ideal choice for both residential and commercial projects. Fabricated using premium-grade unplasticized polyvinyl chloride (UPVC), these windows undergo a meticulous multi-stage manufacturing process to ensure exceptional performance. It begins with the precision extrusion of UPVC profiles, which are then internally reinforced with galvanized steel to enhance structural strength and prevent warping over time. The profiles are cut with advanced CNC machines for exact dimensions, followed by corner welding or mechanical joining to achieve airtight, seamless frames. High-quality EPDM gaskets are inserted to guarantee superior sealing, while double or triple glazing units are fitted to maximize thermal insulation and noise reduction. The sliding mechanism incorporates smooth, corrosion-resistant stainless-steel rollers and a multi-point locking system, ensuring effortless operation and enhanced security. series: 72 series PVC opening style: Top sliding and bottom fixed Color: White Glass: 5mm+9A+5mm clear tempered glass Certification: NFRC, AAMA, CE, TITLE 24, AS2047 U-Factor  ≤ 0.3 SHGC ≤ 0.23