How to distinguish whether the profile is qualified or inferior?
Look at the wall thickness of the profile: The national standard stipulates that the profile is qualified only if the wall thickness reaches 1.4cm. Anything lower than this data is a low-quality product, so you must observe carefully when purchasing.
Look at the cutout of the profile: If you feel that the wall thickness is not easy to measure, it is a better way to distinguish it by looking at the color of the cross-section of the profile.The original aluminum is shiny, which is genuine, while the recycled aluminum is darker and grayer, which is a fake.
Look at the protective film: There will be a protective film on the profile when you buy it. There are brand names, production specifications, anti-counterfeiting marks and other information on it, which can be used for your reference. If you are still not at ease, you can even call the manufacturer directly to inquire about the situation.