Which Bottle Caps Are Made of Aluminum Closure Material

Opening a bottle of chilled beer, popping the pull tab of a can of soda, unscrewing a tube of ointment—we interact with aluminum bottle caps in these everyday actions. Aluminum bottle caps are widely used in the packaging industry due to their lightweight, corrosion resistance, and recyclability. Different grades of aluminum bottle cap material are matched to specific application scenarios based on actual needs.

8011 aluminum foil is a representative aluminum-manganese alloy, widely used in aluminum bottle cap production, especially in the manufacture of easy-open lids for the beverage industry. This alloy has excellent ductility, adapting to the complex stamping process of easy-open lids, while possessing suitable tensile strength, making it easy for consumers to open the pull tab and able to withstand pressure during transportation to prevent leakage. Furthermore, 8011 alloy has excellent surface adhesion, making it difficult for printed ink to peel off, clearly displaying product logos and patterns.

Statistics show that 8011 aluminum foil for bottle cap accounts for over 70% of the global easy-open lid market, and it is the raw material for most easy-open lids of common beverages such as canned cola and canned beer. Meanwhile, 8011 aluminum foil can also be used in cosmetic packaging such as perfume caps and skincare bottle caps, offering advantages such as food-grade standards, thorough oil removal, and excellent oxidation coloring.

3105 alloy, an aluminum-magnesium alloy, is primarily used for bottle caps of bottled wine and edible oil that require long-term sealing. The addition of manganese gives 3105 alloy higher strength and corrosion resistance compared to 8011 alloy. Even after prolonged contact with trace amounts of acidic substances in wine or immersion in edible oil, it maintains structural stability, effectively preventing deformation and leakage.

In thread processing, 3105 aluminum can produce clear and regular screw cap threads with moderate tightness, facilitating opening while creating a tight seal and extending the shelf life of the contents.

In bottled wine and spirits packaging, bottle caps made of 3105 aluminum closures material can be enhanced with frosting and hot stamping processes to improve the product's appearance while protecting the flavor from external influences. This alloy also has applications in industrial fields such as heat exchangers, where its stability has been widely verified.

1060 alloy belongs to the pure aluminum series, with an aluminum content of ≥99.6%. Its core advantage lies in its high purity and low impurity content, making it primarily used in the production of bottle caps for the pharmaceutical and cosmetic industries. This alloy does not react chemically with pharmaceuticals or skincare products in direct contact, ensuring the safety of the contents from the outset.

In the O-state (annealed state), 1060 alloy exhibits excellent ductility, with an elongation exceeding 30%. It can be processed into various complex shapes, such as pharmaceutical screw caps and wide-mouth caps for cosmetics, and can also achieve precise sealing structure designs.

Furthermore, its excellent electrical and thermal conductivity ensures uniform heat transfer during the sterilization process of pharmaceutical packaging, meeting stringent hygiene standards. 1060 alloy is commonly used as a raw material for eye drop bottle caps, ointment sealing caps, and some cosmetic sample bottle caps.

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