Steel doors and windows to distinguish whether the toxic ways: First, look at the product profile name. Toxic PVC doors and windows are generally inexpensive lead salt stabilizer as the main raw material. This material lead, the name "PVC profiles." Non-toxic and non-toxic and non-polluting steel doors and windows is used, in line with environmental requirements mercaptan organotin stabilizer T-137, the name "VPVC profiles." Second, look at packaging and labeling. See product packaging or on the tab labeled product name, performance standards, name and address, quality grade. Such as basic content tagging is complete, whether text or images chromatic ghosting or bias. Such as packaging and labeling content insufficiency Gaocheng steel doors and windows, text or graphics overlay ghosting or bias, is certainly small sections of production of good quality steel doors Which Gaocheng, 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 or test report test items marked with lead components, proven products are PVC profiles. Steel doors and aluminum doors and fire performance and lightning and electrostatic ask Performance Comparison: Fire performance flame-retardant PVC plastic-steel windows relative to combustible wooden windows is better, but with non-combustible aluminum windows are poor compared to . Aluminum is a good conductor, so the enclosure structure for the time, to take effective measures to ground can be used as lightning protection facilities, and prevent static phenomenon. Steel doors and aluminum doors and decorative and aging issues, compare deformation and expansion issues: plastic-steel windows as a building outside the window, only in white, can not meet all types of building colorful wall decoration needs. PVC plastic profiles will be aging, polymer PVC resin under ultraviolet light, macromolecular strand breaks, and the material surface tarnish Gaocheng steel doors and windows installers, color chalking Gaocheng steel doors outlets, the mechanical properties of profiles decline. While aluminum has anti-aging functions. Steel windows susceptible to thermal deformation, cold brittle, size and shape stability is poor, often requires the use of a glass window frame rigidity to prevent distortion. The aluminum has a high temperature, not easily deformed and so on. Gaocheng steel doors, steel doors and windows installers Gaocheng, provided by the gorgeous gorgeous windows and doors windows and doors. This information consists of: providing Shijiazhuang Ramada Door (www.sjzygf.com), we are business alliance member, the integrity of the whole network certification vendor. Feel free to contact us, contact: Liuling Bo