Though small as a thumb, a wine bottle cap plays a crucial role in sealing the product, enhancing brand image, and shaping user experience. With increasing market demands for aesthetics, tamper resistance, environmental sustainability, and material compatibility, selecting the right alloy for bottle caps is not only essential to product quality but also directly impacts market competitiveness.

For wine bottle caps—especially modern aluminum screw caps (commonly referred to as “high aluminum caps” or “BVS caps”)—the most suitable alloys are typically from the 8xxx or 3xxx series aluminum alloys, with the most commonly used and recognized being:

8011 Aluminum Alloy

This is the primary alloy used for wine bottle caps. As part of the 8xxx series (aluminum-iron-silicon system), 8011 is a non-heat-treatable alloy. Its low earing rate (<4%) and excellent formability make it ideal for deep drawing processes, ensuring edge integrity and consistent thickness for tall caps with high aspect ratios. It also has excellent coating adhesion, making it ideal for printed and decorative wine caps.

Key Features:

• Excellent Deep Drawing Capability: Essential for cap manufacturing involving stamping and stretching. 8011 adapts well to complex forming without cracking.

• Moderate Strength: Sufficient to maintain shape and seal integrity without being too rigid or difficult to open.

• Outstanding Corrosion Resistance: Naturally corrosion-resistant, aluminum 8011 helps protect wine from external environmental factors.

• Excellent Printability: The surface of 8011 alloy accommodates various printing techniques, suitable for logos and branding.

• Food-Grade Safety: Complies with food contact safety standards, ensuring no negative impact on wine taste or quality.

• Highly Recyclable: Aluminum is a highly recyclable material, giving aluminum caps excellent environmental benefits.

3105 Aluminum Alloy

A part of the 3xxx series, 3105 is an aluminum-manganese alloy known for its strong deep drawing performance, making it suitable for forming more complex cap shapes. Its higher strength and excellent corrosion resistance allow it to withstand pressure and guard against potential risks associated with wine packaging.

Key Features:

3105 offers slightly higher strength than 8011 but has slightly lower deep draw performance, making it more suitable for shallow-draw screw caps and other applications where deep forming is not required. It’s often used for beverage container caps where greater strength is desired.

Common Forms of Aluminum for Bottle Cap Production:

Aluminum Coil (Color-Coated Aluminum Rolls)

Aluminum Sheet (For Deep Drawing and Stamping)

Coated Aluminum Strip (Pre-Treated Surface)

Application Recommendations:

8011 Aluminum Alloy for Caps:

Standard wine screw caps in mass production (especially deep-drawn tamper-evident types)

Applications requiring high-temperature sterilization, such as in the bottling of certain sweet wines

3105 Aluminum Alloy for Caps:

Customized caps for premium wines (requiring complex surface finishing or non-standard shapes)

Lightweight caps for short-term consumption markets (can be thinned to below 0.15 mm)

We also commonly supply 1060, 3104, 3105, 5052, 5182, and 8011 aluminum materials for bottle caps, meeting a wide range of processing requirements and suitable for multi-color printing.

MC Aluminum specializes in producing aluminum base materials for bottle caps. With advanced degreasing lines and domestic cut-to-length equipment, we ensure clean surfaces and low earing rates. Our aluminum materials are widely used in alcohol, beverage, pharmaceutical, and cosmetics cap packaging sectors. Our products are exported to Korea, Japan, North America, the United States, Southeast Asia, and more, receiving great acclaim from customers. We offer factory-direct pricing, free samples, and reliable quality you can trust.