A How to choose the oxidation degree of aluminum alloy profiles? When purchasing aluminum alloy profiles, you can ask the merchant to give you a sample of the product, and then scrape the sample with your fingernails to see whether the oxide film on the surface is wiped off. If the oxide film on the surface is easily wiped off, it indicates that the profile is of poor quality, and it is not recommended to buy. If it cannot be wiped off after repeated scraping, it indicates that the quality is good and worth buying.
