Aluminum Closure Sheet Coil

What is Aluminum Closure Stock?

Aluminum closure stock refers to aluminum sheet and coil materials specifically designed for stamping and forming packaging components such as bottle caps, can ends, ring-pulls, and pilfer-proof (tamper-evident) bands. It demands extremely high comprehensive standards in terms of dimensional accuracy, surface quality, mechanical properties, and food safety.

Worthwill has been deeply engaged in the closure stock industry for many years. Covering the beverage, food, wine & spirits, pharmaceutical, and cosmetics sectors, we provide one-stop aluminum coil solutions ranging from alloy selection to customized specifications.

Coil Specifications & Procurement Parameters

• Alloys: 1060, 1070, 1100, 3003, 3004, 3105, 5052, 5182
• Temper: O (Soft, suitable for deep drawing) or H (Hard, suitable for high rigidity)
• Core ID: 300 / 350 / 405 / 505 mm
• Coil Weight: 500 – 3, 000 kg
• Thickness Tolerance: Standard ±0.005 mm / Precision ±0.003 mm
• Width Tolerance: Standard ±1 mm / Precision ±0.5 mm
• Earing Rate: Standard ≤3% (The proportion of wavy edges at the cup mouth after deep drawing. This must be strictly controlled for long caps, as it directly impacts the scrap rate).
• Edge/End Quality: Flat, burr-free, with strictly controlled telescoping (layer staggering).

Main Alloy Systems & Specifications

8011 Alloy

Specially designed for food and pharmaceutical packaging. It features excellent formability, low earing rate (≤3%), and outstanding surface flatness. It is the absolute mainstream choice for ROPP (Roll-On Pilfer-Proof) caps, tamper-evident caps, and deep-drawn long caps.

It offers excellent deep-drawing quality and coating adhesion, ensuring high-quality printing results.

• Common Tempers: H14, H16, H18, H44, H46
• Thickness: 0.15 mm – 0.30 mm
• Width: 500 mm – 1000 mm

3003 Alloy

An Al-Mn alloy containing about 1.0%–1.5% manganese. Its strength is approximately 20% higher than 1100, balancing plasticity and formability. It is one of the most widely used alloys for closure stock.

Ideal for beverage caps, screw caps, and pilfer-proof caps that require both strength and formability.

• Tempers: O, H14, H16, H18, H19
• Thickness: 0.15 mm – 0.50 mm
• Width: 100 mm – 1600 mm

3004 Alloy

With magnesium added to the 3003 base, its strength is further enhanced while maintaining excellent deep-drawing formability. It is the industry standard alloy for 2-piece can bodies.

• Tempers: H19, H34, H38
• Thickness: 0.20 mm – 0.50 mm
• Width: 800 mm – 1600 mm

3105 Alloy

Offering higher strength than 8011, it can withstand greater internal gas pressure, making it the ideal material for screw caps of carbonated drinks and mineral water. It supports chromating treatments and DOS oiling, and can also be color-coated and printed on a mill finish base.

• Tempers: H14, H16, H44, H46
• Thickness: 0.20 mm – 0.25 mm
• Width: 500 mm – 1000 mm

1060 Alloy

Pure aluminum strip with excellent plasticity, dedicated to producing vial seals. The surface can be protected via anodizing, coated with clear epoxy resin on both sides, or color-coated (gold, yellow, red, blue, black) on a single side.

• Thickness: 0.15 mm – 0.30 mm
• Width: 30 mm – 1000 mm
• Core ID: Paper core 76 mm, 152 mm, or 80 mm coreless

5052 / 5182 Alloy

Commonly used for beverage can ends, Easy-Open Ends (EOE), and Twist-off caps. These alloys boast outstanding corrosion resistance, high strength, excellent formability, and strong sealing capabilities to prevent leakage.

They are the industry standard for beverage/beer can ends, ring-pulls, and Omnia twist-off caps.

• Tempers: H19, H48 (Can ends) / H14, H16 (Twist-off caps)
• Thickness: 0.22 mm – 0.50 mm (Can ends) / 0.20 mm – 0.25 mm (Twist-off)
• Width: 500 mm – 1600 mm

1070 / 1080 / 5005 / 5657 Alloys

Cosmetic packaging has extremely high demands for surface optical effects and tactile feel. These alloys support deep drawing, chemical/electrolytic polishing, and anodizing coloring processes.

• Tempers: H22, H24, H26, H18, H19
• Thickness: 0.20 mm – 2.0 mm
• Width: 20 mm – 1250 mm

Key Mechanical Properties & Technical Indicators

Earing Rate & Deep Drawability

For long ROPP caps like 30×60 mm, controlling the earing rate is critical. Worthwill stably controls the earing rate of our 8011 closure stock at ≤3%, ensuring a flat skirt after deep drawing and significantly improving material utilization.

Core Alloy Mechanical Parameters

• 8011 H14/H16: Thickness 0.15–0.27 mm | Tensile Strength (UTS): 130–165 MPa | Elongation: ≥1%.
• 8011 H16/H18: Thickness 0.18–0.30 mm | Tensile Strength (UTS): ≥165 MPa | Elongation: ≥1%.
• 8011 / 5182: Tensile Strength (UTS): 180–220 MPa | Yield Strength (YS): ≥145 MPa | Elongation: ≥2%.

Surface Treatment & Coating

The surface treatment quality directly determines the printing performance and corrosion resistance. Available surface finishes include: Mill finish, DOS oiling, Chromating, Single-sided color coating/protective lacquer, and Double-sided clear lacquer/varnish.

• Food-Grade Safe Coatings: The inner coating utilizes retort-resistant, acid/alkali-resistant, BPA-free epoxy resins. The outer coating balances weather resistance with superb printing effects. Coating weight is strictly controlled (Light colors: 2–6 g/m²; Dark colors: 10–13 g/m²).
• Rigorous Quality Testing: All coatings must pass the "121℃ × 30 mins high-temperature retort test" and "MEK solvent rubbing test, " with a guarantee of no fading or peeling.
• High-End Customization: We support anodizing (exclusive for wine/cosmetics to enhance anti-corrosion and premium texture), as well as embossing and hot stamping for anti-counterfeiting and brand enhancement.
• Comprehensive Delivery States: Available in mill finish, DOS oiled, chromated, single/double-sided coated or lacquered, supporting customized branding needs.

Material Selection Guide (For Reference)

Easy-Open Ends (EOE) & Can Ends

• Selection: Can body 3004 / Ends & Tabs 5182 / EOE 5052 or 8011.
• Pain Point Solved: Withstands high internal pressure despite extreme thinness; high-precision scoring ensures the tab pulls open smoothly without breaking.

Aluminum Pilfer-Proof Caps (Wine / Spirits / Beverages)

• Selection: Long caps 8011 / Spirits 3105 or 3003 / Water 1100.
• Pain Point Solved: Strict earing control (≤3%) for long caps minimizes scrap; crisp skirts and precise threading; optimal breaking force for the tamper-evident ring.

Glass Bottle Twist-off Caps (Jam / Ketchup Jars)

• Selection: Twist-off 5182 / Omnia shallow-drawn caps 8011.
• Pain Point Solved: 5182 provides high strength ensuring the lugs firmly grip the glass threads; inner coatings withstand pasteurization and high-temp retorting.

Pharmaceutical Aluminum Seals (Vials / IV Bottles)

• Selection: 1060 / 3003.
• Pain Point Solved: Produced in GMP Class 1000 cleanrooms; coatings withstand 121℃ retorting without color fading; smooth, effortless one-hand tear-off.

Yogurt Lidding Foil

• Selection: 8011 Aluminum Foil.
• Pain Point Solved: Thickness tolerance precise to ±0.002 mm; ultra-low pinhole rate; flawless heat sealing in refrigerated environments without leakage.

High-End Cosmetic Packaging (Perfume Caps / Lipstick Tubes)

• Selection: 1070 / 1080 / 5005 / 5657.
• Pain Point Solved: Ultimate deep-drawing performance; perfectly adapted for mirror polishing and anodized coloring for a luxurious texture.

Advantages of Aluminum Caps over Tinplate and Plastic

• Vs. Tinplate Caps: Aluminum is much lighter, reducing freight costs; it contains no iron, meaning scratches won't cause rust that could contaminate contents; its scrap recycling value is much higher, with aluminum recycling rates far exceeding tinplate.
• Vs. Plastic Caps: Aluminum offers vastly superior barrier properties (Oxygen and Moisture Vapor Transmission Rates are near zero); aluminum is 100% infinitely recyclable, perfectly aligning with global sustainable packaging regulations; the metallic texture better suits high-end brand positioning.

Certifications & Compliance

Aluminum closure stock for food and pharmaceutical applications must comply with target market regulations, including:

• China: GB 4806.9 (Food contact metal materials), YBB Series (Pharmaceutical packaging).
• USA: FDA 21 CFR Part 175–178 (Coatings for food contact).
• EU: Regulation (EC) No 1935/2004 (Food contact materials framework).
• Third-Party: SGS, Intertek reports for chemical composition and migration testing.

Worthwill can provide Mill Test Certificates (MTC), RoHS compliance declarations, Food Contact Safety Declarations (DoC), and third-party test reports upon customer request.

Why Choose Worthwill?

Worthwill possesses the production capacity for the full series of 1xxx, 3xxx, 5xxx, and 8xxx closure stock, covering all packaging needs including ROPP caps, pilfer-proof caps, vial seals, Omnia caps, Twist-off caps, EOE, and cosmetic packaging.

• One-Stop Delivery: From aluminum coil base rolling (8011/3105) to surface coating and color printing, the entire process is under our in-house quality control.
• Strict Core Metrics: We guarantee ultra-low earing rates (≤3%) and superior flatness, completely eliminating color registration deviations during printing.
• Endorsed by Global Giants: Rich experience in multinational cooperation, meeting the rigorous technical standards of industry leaders like Guala, Nippon, CSI, and Herti.
• End-to-End Tech Support: We provide comprehensive engineering services from material selection and sample testing to on-site machine commissioning.