3105 aluminum sheet belongs to the 3xxx series aluminum-manganese alloy family and is one of the most widely used and stable materials in the aluminum industry. With the addition of manganese, the alloy offers excellent corrosion resistance, moderate strength, superior deep-drawing formability, and outstanding coating adhesion. These characteristics make it an ideal material for producing spirits closures, including ROPP caps, screw caps, long caps, and tamper-evident wine closures.

The main reason 3105 aluminum is preferred for high-speed cap production is its exceptional stability during deep drawing, stretching, and stamping operations. It resists edge cracking and wrinkling, even under extreme deformation, making it highly suitable for automated cap-making lines.

3105 aluminum sheet for spirits closures is typically supplied in coil form. Common temper conditions include H14, H16, and H18 (semi-hard to hard). Strict thickness tolerance control usually between 0.20 mm and 0.23 mm ensures accurate feeding and flawless forming on high-speed stamping lines.

Performance Advantages of 3105 Bottle Cap Aluminum Sheet

1. Excellent Deep-Drawing Performance

3105 aluminum alloy in H14/H16 condition exhibits superb ductility and isotropy. It can withstand significant stretching and deformation without cracking or wrinkling, making it perfect for long caps, rolled threaded caps, and deep tamper-evident closures.

2. Strong Corrosion Resistance

As a 3xxx series anti-rust alloy, 3105 aluminum offers reliable corrosion resistance. Bottle caps remain clean and blemish-free even in humid storage conditions such as wine cellars, avoiding corrosion spots or white rust marks.

3. Superior Coating Adhesion

After surface pretreatment, 3105 aluminum shows excellent adhesion to food-grade inks and protective coatings such as epoxy resins. This ensures long-term durability cap graphics remain vivid, scratch-resistant, and fade-resistant during storage and handling.

4. High Surface Flatness

3105 aluminum sheet features high surface smoothness with minimal oil stain, making it an ideal substrate for offset printing. It reproduces intricate brand logos, embossing patterns, and security graphics with precision and clarity.

5. Safety for Food and Beverage Applications

Aluminum is a safe, non-toxic, food-contact-grade material. It does not react with spirits or alter flavor profiles, nor does it release harmful substances. This ensures compliance with strict global food safety standards.

6. Sustainable and Economical

Compared with plastic or composite closures, aluminum caps offer significant cost efficiency. Aluminum is 100% infinitely recyclable, with low energy consumption during recycling. This makes it an environmentally friendly choice aligned with global sustainability trends.

Specifications - 3105 Aluminum Closure Sheet for Bottle Caps

Application Fields

Spirits and Alcoholic Drinks

Whisky, baijiu, vodka, gin, brandy, rum, and other premium spirits that require durable, airtight closures.

Premium Wine Packaging

Used for long caps and tamper-evident wine closures.

Beverage & Pharmaceutical Packaging

Suitable for ROPP caps, perfume caps, health supplement bottle caps, and aluminum closures for PET bottles and small vials.

How to Choose the Right 3105 Aluminum Sheet

Confirm Temper and Dimensions

Based on the complexity of the bottle cap design and the production line speed, confirm the most suitable alloy condition (e.g., O temper for ultra-deep drawing, H14 for caps requiring higher rigidity) and precise thickness and width tolerances with the supplier.

Inspect Surface Quality

Strictly confirm the surface quality requirements of the aluminum strip, such as smoothness, absence of oil spots, and absence of scratches. This is a prerequisite for ensuring flawless subsequent printing and decoration.

Choose a Reliable Supplier

Prioritize well-known manufacturers with large-scale, stable production capabilities, advanced hot rolling production lines, and mature technical teams. This not only ensures consistent material performance but also guarantees a long-term, stable supply.