folding sliding aluminium patio doors sliding shower glass doors mosquito net for aluminium sliding windows corner bifold doors with post The quality of aluminum alloy doors and windows on the market is uneven. Because of the low threshold of the aluminum alloy door and window industry, the market supervision is not strong, resulting in a large number of counterfeit products on the market and small local workshops that operate without a license. As a consumer, if you are not careful, you will enter the trap of low prices and buy inferior products. How to see the quality of aluminum alloy doors and windows? Look at the materials. The thickness, strength and oxide film of the aluminum profiles used for high-quality aluminum alloy doors and windows should comply with relevant national standards. The wall thickness should be 1.2 mm or more, and the tensile strength should reach 157 Newtons per square meter. The yield strength should reach 108 Newtons per square millimeter, and the oxide film thickness should reach 10 microns. If the above standards are not met, it is inferior aluminum alloy doors and windows and cannot be used. Second, look at the processing. High-quality aluminum alloy doors and windows, fine processing, careful installation, good sealing performance, and easy opening and closing. Inferior aluminum alloy doors and windows, blindly select aluminum profile series and specifications, and the processing is rough, and sawing instead of milling is not required. Installation, poor sealing performance, uncomfortable opening and closing, not only leakage of wind and rain and glass explosion phenomenon, but also when encountering strong wind and external force, it is easy to scrape or knock the sliding part or glass off, destroying things and hurting people. Three look at the price. Under normal circumstances, due to the high production cost of high-quality aluminum alloy doors and windows, the price is about 30% higher than that of inferior aluminum alloy doors and windows. Some have aluminum alloy doors and windows made of aluminum profiles with a wall thickness of only 0.6-0.8 mm, with tensile strength And the yield strength is much lower than the relevant national standards and regulations, and it is not safe to use. In addition, there are many self-employed people who process aluminum alloy doors and windows, and they do not understand the structural characteristics and performance of aluminum alloy doors and windows. In order to reduce costs, cut corners and shoddy materials. , The hidden danger of the product is relatively large, and it is generally not suitable for use.