There are more and more types of doors and windows in the real market, and many consumers are deceived because of the quality of windows and doors. We often find it hard to deal with so many types on the market. Customers who buy steel doors and windows will have such a doubt on the market there are many new doors and windows, then recommend new steel windows and doors. Plastic doors and windows how to quality 1, the color of the steel is not as white as possible, should be white pan, feel good, and calcium are essentially different. 2. PVC is made of rigid PVC mixed resin (PVC-U) profile and metal reinforced aggregate PVC-U is rich in toughness and elasticity, and the high quality plastic-lined metal is rust-proofed, and A certain thickness. 3, high-quality steel windows and doors accessories printed on the brand name, color and clean. 4, the machining accuracy and fullness of welding, neatness and so is a major symbol of the quality of steel. 5, high-quality steel doors and windows should be quality assurance and production license. 6, steel doors and windows can be prepared monolithic glass, vacuum glass and laminated glass. Do not buy cheap PVC doors and windows. Should pay attention to glass and hardware. Glass should be flat, no watermarks. Glass and plastic profiles are not in direct contact with the sealing tape close to the gap. Hardware complete, the correct location, installation firm, flexible use. Look at the surface of the door and window, it should be smooth and flat, no obvious scratches. Look at the welding corner for cracks, open welding fracture. See the seal, it should be smooth, no curling, no groove, strip odorless. When the windows and doors are closed, there is no gap between the fan and the box. Look at the doors and windows are all one after another, no screw connection. Sliding doors and windows should be slid freely open, soft sound, no dust off. Look door and window frames, fan profiles, should be embedded with special steel liner. Look at the glass, it should be smooth, the installation is firm, the installed glass does not directly contact the profile, the glass glue can not be used, and if there is double-glass flat layer, there should be no dust and water vapor in the interlayer. Look at the switch components, should be closed tight, flexible switch. Plastic doors and windows are in the factory workshop with professional equipment processing, can not be produced at the construction site. Before selecting a certain unit of plastic-steel doors and windows, consumers must first ask for the quality inspection report of plastic-steel doors and windows and check their 4 key indexes: hardness (HRR), low-temperature drop-hammer impact test, 3 indicators according to GB8814-89 regulations) and the angle strength test (according to GB17793-89 regulations) whether to meet the requirements.The above four indicators can reflect the quality of steel doors and windows, and not according to the standard processing of products not easy to reach the standard. Plastic doors and windows new products recommended High-tech curtain wall windows and doors of high-quality steel doors and windows of new products: steel doors and windows offer The above is a small series for you to provide information on the quality of steel doors and windows and plastic doors and windows new recommended knowledge, at present, the choice of plastic doors and windows of consumers more and more, but for this to remind consumers of the experts, we must first understand the steel doors and windows Use of PVC profiles. Good PVC profiles should be a reasonable design of the multi-cavity, wall thickness, formula contains anti-aging, anti-UV additives, from the surface should be smooth surface, color blue and white. Hardware. | 
