In today’s packaging industry, screw caps serve as crucial sealing and protective components, widely used in the beverage, food, pharmaceutical, and personal care sectors. 3105 aluminum alloy, a typical anti-rust aluminum alloy, is highly favored in the manufacturing of screw caps and other premium closure products due to its excellent mechanical properties, outstanding corrosion resistance, and superior formability. Treated into different tempers such as H14 and H16, 3105 aluminum sheet, strip, and foil offer an ideal balance between formability and strength, perfectly meeting the requirements for screw cap production.

Overview of 3105 H14/H16 Aluminum Alloy

3105 is an aluminum-manganese alloy (3xxx series) containing 0.30%-0.8% manganese. It combines lightweight properties (density of 2.73 g/cm³) with strength and corrosion resistance, making it especially suitable for hygienic applications such as food packaging. The H14 and H16 tempers are achieved through cold working, offering a range of strength levels to meet diverse screw cap requirements.

• H14 Temper: Moderately work-hardened, offering good strength and excellent formability, suitable for standard cap forming processes.

• H16 Temper: Higher hardness and strength compared to H14, with slightly reduced elongation, ideal for applications requiring enhanced pressure and deformation resistance.

Advantages of 3105 Aluminum Sheet for Screw Caps

1.Excellent Anti-Rust Properties: As an Al-Mn alloy, 3105 offers superior corrosion resistance, making it highly durable even in moist or mildly acidic environments such as beverage residues or fruit juices.

2.Outstanding Deep Drawing Performance: In the H14/H16 temper (semi-hard state), the material maintains a perfect balance between strength and plasticity. Post-annealing, its plasticity improves further, supporting complex deep drawing processes without defects such as ear formation or cracking.

3.Moderate Strength: Ensures caps retain their shape during tightening while allowing easy manual opening by consumers.

4.Good Welding Properties: Compatible with resistance welding and laser welding, facilitating the assembly of caps with tamper-evident rings or sealing liners.

5.Excellent Printing and Coating Adhesion: 3105 aluminum offers a smooth surface, ideal for high-quality printing and coating applications, enhancing product aesthetics.

6.High Material Utilization: Thanks to its good ductility, 3105 reduces stamping scrap rates and, combined with its relatively low raw material cost, effectively lowers the manufacturing cost per cap.

7.Environmentally Friendly and Recyclable: Aluminum is 100% recyclable, supporting sustainable and eco-friendly manufacturing practices.

Specifications for 3105 Aluminum Closure Material

Mechanical Properties of 3105 Aluminum Alloy

Chemical Composition of 3105 Aluminum Alloy (%)

Applications of 3105 Aluminum Strip and Foil

Compared with 8011 closure sheet, 3105 aluminum sheet provides sufficient strength to withstand internal gas pressure, making it widely used in the production of screw caps for carbonated beverages and alcoholic drinks, such as soda water and sparkling wines.

MC Aluminum is a professional manufacturer specializing in aluminum closure materials. We offer a full range of 3105 H14/H16 aluminum sheet, strip, and foil products, with customized production services. Our products are widely used by leading beverage and wine companies, and are exported worldwide. Samples are available upon request. We offer factory-direct sales with competitive prices. Welcome to contact us for more information!