Hardness: Many customers are very concerned about hardness when purchasing aluminum, as it has a direct relationship with the alloy's chemical composition. Secondly, the different states also have a significant impact, with the hardness decreasing in the order of 7-series, 2-series, 4-series, 6-series, 5-series, 3-series, and 1-series.

Strength: Strength is a critical factor to consider during product design, especially when aluminum alloy components are involved. The appropriate alloy should be selected based on the pressure they are subjected to. Pure aluminum has low strength, whereas 2-series and 7-series heat-treated alloys offer higher strength and hardness, which are somewhat correlated.

Corrosion Resistance: The corrosion resistance of industrial aluminum profiles includes properties such as chemical corrosion and stress corrosion resistance. Generally speaking, 1-series pure aluminum has good corrosion resistance, followed by 5-series, then 3-series and 6-series, with 2-series and 7-series being relatively poor. The selection principle for corrosion resistance should be determined based on the application scenario. In environments with high-strength alloy corrosion, various anti-corrosion composite materials must be used.

Processing Properties: This includes forming properties and cutting properties. Since forming is related to the state, when selecting aluminum alloys, it is also necessary to consider the strength range of various states, as materials with higher strength are usually harder to form. If bending, stretching, deep drawing, and other forming processes are required for aluminum materials, the forming properties of materials in the annealed state are better, whereas those in the heat-treated state are较差. Aluminum alloys have poor cutting properties. For molds and mechanical parts that require good cutting properties, the opposite is true; materials with lower strength have poor cutting properties, and the cutting properties of aluminum alloys are an important consideration for products that require machining, such as molds and mechanical parts.

Weldability: Most aluminum alloys have no issues with weldability, especially certain 5-series alloys, which are specifically designed for welding. In contrast, some 2-series and 7-series aluminum alloys are more challenging to weld.

Decorative Performance: When industrial aluminum profiles are used for decoration or in specific applications, surface treatments such as anodizing and painting are necessary to achieve the desired color and surface texture. In this case, the decorative aspect should be considered. Generally speaking, materials with good corrosion resistance also exhibit excellent anodizing, surface treatment, and painting properties.