UPVC windows are made of polyvinyl chloride (UPVC) as the main raw material, plus a certain proportion of stabilizers, colorants, fillers, ultraviolet absorbers, etc., through extrusion molding, and then made by cutting, welding or screwing. Fan into the door and window frame. Equipped with sealing strips, tops, hardware, etc., and at the same time to enhance the rigidity of the profile, steel lining needs to be filled in the cavity of the profile that exceeds a certain length, and the window made in this way is called an UPVC window.