For outsiders, basically they don’t know much about it. Moreover, doors and windows are customized products, and there is no uniform price standard, which really stumps many owners. So, how to choose broken bridge aluminum doors and windows to choose high-quality? Let’s listen to what the insiders say! Choosing the broken bridge aluminum doors and windows mainly depends on these four key points: 1. Aluminum Is the aluminum virgin aluminum or recycled aluminum? Doors and windows made of primary aluminum are superior to recycled aluminum in terms of strength, hardness, toughness, oxidation resistance and service life. For doors and windows made of recycled aluminum, you will find the texture of the doors and windows is rough, because aluminum raw materials contain more impurities. Of course, many people may not be able to tell this point. However, the wall thickness of aluminum doors and windows must meet the standard. No less than 1.4mm. Although the current new national standard requires external windows not less than 1.8mm from February this year, it is estimated that this policy has not been fully implemented by various door and window factories. The problem, we must ensure that the wall thickness meets the requirements. 2. Insulation