What Are 8011 Aluminum Alloy Applications

In the large family of aluminum alloys, aluminum foil alloy 8011 is favored by many industries due to its unique properties and wide applicability. As an alloy with aluminum as the matrix and added elements such as silicon and iron, 8011 not only has good corrosion resistance and processing performance, but its diverse thickness range provides unlimited possibilities for applications in different fields.

Basic characteristics of 8011 aluminum alloy

8011 aluminum foil for bottle cap belongs to the 8000 series aluminum alloy. Its main components are aluminum (Al), silicon (Si, 0.6-1.0%), iron (Fe, 0.7-1.0%), and a small amount of other trace elements.

1. Chemical stability and safety

Composition characteristics: The addition of silicon (Si) and iron (Fe) in 8011 aluminum alloy improves the corrosion resistance of the material, especially stable to media such as water, alcohol, and weak acid, avoiding chemical reactions with the contents.

Surface treatment: The barrier properties can be further enhanced by anodizing or coating treatment to ensure food safety.

2. Excellent forming performance

Balance of ductility and strength: The medium strength (tensile strength 120-160MPa) and good ductility of 8011 make it difficult to crack during stamping, and it is suitable for manufacturing complex structures (such as threads, anti-theft rings).

Thickness adaptability: The commonly used thickness range is 0.2-0.5mm, which can not only ensure the rigidity of the bottle cap, but also facilitate high-speed stamping (such as a production rhythm of thousands of times per minute).

3. Cost and environmental advantages

Raw material economy: The cost of silicon and iron elements is lower than that of alloy elements such as copper and magnesium, and the price of 8011 is significantly lower than that of aluminum alloys such as 5052 and 3003.

Recyclability: The recycling rate of aluminum is as high as over 95%, which is in line with the trend of circular economy.

Typical application scenarios

1. Beverage bottle cap

Mineral water/carbonated beverage: Use 0.25-0.35mm thick 8011 sheet, form a threaded structure by stamping, and seal with PE gasket.

Functional beverage/tea beverage: Higher corrosion resistance is required, and the acid resistance of 8011 can resist the erosion of tea polyphenols or electrolytes.

2. Food packaging bottle cap

Sauce/canned food: The bottle cap needs to withstand high temperature sterilization (such as 121℃ cooking), 8011 aluminum alloy still maintains structural stability at high temperature, and the surface coating can prevent sulfide corrosion.

Edible oil bottle cap: 0.3-0.4mm thick 8011 sheet with aluminum foil gasket can effectively block oxygen and extend the shelf life of the product.

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