Hexene steel doors are PVC (UPVC) resin as the main raw material, with a proportion of stabilizing agents, coloring agents, fillers, ultraviolet absorbers, extruded into profiles, and by cutting, welding or screwing way into the door frame fan, fitted with steel doors and disadvantages of sealing tape, tops, hardware, etc., as well as to enhance the rigidity of steel doors and classified profiles, profiles of more than a certain length of the cavity to fill out additional steel liner (ribs) steel doors and windows prices, made this portal window, called the steel doors. Steel doors and windows Disadvantages: 1: PVC Material Steel is bad, it must be added internally to increase the hardness of the steel bars. Plastic shortcomings. 2: fire performance slightly worse, if required under fire conditions is relatively high, it is recommended to use aluminum material. Plastic shortcomings. 3: brittle plastic material, aluminum compared to heavier, would toxic emissions when burned. Gorgeous windows and doors, steel doors [classification], steel doors and windows provided by Ramada. Search for "Shijiazhuang sun room, bridge aluminum doors and windows, shower room, glass partition" reliable supplier network operators choose to have the whole alliance certification: Shijiazhuang gorgeous Door (www.sjzygf.com), trustworthiness and reliability, now "Business League Support" page click on the live chat with us now!