UPVC, or unplasticized polyvinyl chloride, is the primary material used in UPVC windows. It's a durable, lightweight, and low-maintenance material that offers excellent thermal insulation properties. UPVC windows are constructed using extruded UPVC profiles, which are cut and welded together to form the window frames and sashes. These profiles are engineered with multiple chambers to enhance strength, insulation, and weather resistance.

