Pure aluminum with a purity (aluminum content) greater than 99.8% is usually called highpurity aluminum. It is produced by directional solidification refining of high quality fine aluminum. Aluminum foil can have different grades of purity, depending on the manufacturing process and the application. In general, industrially produced aluminum foil usually has a high purity, often above 99%. This means that aluminum foil contains very few impurities and other metallic elements.
Food-grade aluminum foils used in food packaging and cooking usually require even higher purity, often above 99.9%, to ensure their safety and harmlessness. These foils are often referred to as "food-grade" foils and can be used for food packaging, cooking and baking.
High-purity aluminum can be subdivided into ultra-high-purity aluminum (aluminum content of 99.5% ~ 99.95%), ultra-high-purity aluminum (aluminum content of 99.996% ~ 99.999%) and very high purity aluminum (aluminum content of 99.999% or more). High-purity aluminum is silver-white, with a smooth surface, clear crystalline grain, and contains no inclusions. High-purity aluminum has low deformation resistance, high conductivity and good plasticity and other properties, mainly used in scientific research, electronics industry, chemical industry and the manufacture of high-purity alloys, laser materials and some other special purposes.
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