Ramada steel doors and windows _ [] _ ??steel doors installers provided by the gorgeous windows and doors. We are Shijiazhuang gorgeous Door (www.sjzygf.com) here: specializing in Shijiazhuang, Hebei: Shijiazhuang sun room, bridge aluminum doors and windows, shower doors and glass partitions the physical properties of steel mainly refers to: PVC plastic doors and windows for air infiltration sex (tightness), water leakage, (watertight), wind pressure resistance and thermal and sound insulation properties. Since PVC window profiles with a unique multi-chamber structure, and by the welding process from how to sell the steel doors and windows, steel doors and windows installed in the gaps of all windows and doors are equipped with steel doors and windows sealing strip and tops, so good physical properties. Steel doors and windows to tell whether the toxic ways: First, look at the product profile name. Toxic PVC doors and windows are generally inexpensive lead salt stabilizer for the main raw material. This material leaded steel doors and retailers, the name "PVC profiles." Non-toxic and non-toxic plastic doors and windows are clean, environmentally friendly mercaptan organotin stabilizer T-137 steel doors and installers, the name "VPVC profiles." Second, look at packaging and labeling. Look tab on the product packaging or labeling of the product name, the implementation of standards, name and address, quality grade. If the basic content tagging is complete, whether text or images chromatic ghosting or bias. Such as packaging and labeling incomplete content, text or graphics overlay ghosting or bias, is certainly small sections of production, it is best not to buy. Third, look at quality proof. After selecting steel doors and windows must be accountable to the dealer to ask for product quality inspection certificate. If the certificate of inspection reports or test items marked with a lead content, prove that the products are PVC profiles.