Alloy 8011 H14 White Lacquered Aluminum Coil, Food Safe for Metal Bottle Cap Manufacturing

This 8011 H14 white roller coated aluminum coil/sheet is a food-grade lacquered material specially engineered for high-speed stamping and deep drawing of metal bottle caps, including beverage screw caps, ROPP caps and pharmaceutical closures. It features uniform white coating, clean surface, low earing rate and outstanding formability, which effectively prevents cracking and wrinkling during curling and threading processes. The food-safe coating meets packaging hygiene standards, offering reliable barrier performance against moisture and oxygen to protect inner contents. Available in custom widths and thicknesses, this aluminum stock delivers stable mechanical properties and consistent coating adhesion, ideal for mass production of bottle caps in food, drink and healthcare packaging industries.

8011 H14 Bottle Cap Aluminum Specifications

Why 8011-H14 Is Used for Aluminum Bottle Caps

Balanced Strength and Formability

H14 is a strain-hardened temper that provides more rigidity than fully annealed aluminum while retaining useful forming capability. This balance is important when closure stock passes through blanking, drawing, curling, knurling or threading operations.

Suitable for Repeated Closure-Forming Operations

A bottle cap may undergo several deformation steps before it becomes a finished closure. Material strength, elongation and temper consistency should therefore remain stable from coil to coil to support repeatable cap geometry.

Good Surface for Lacquering and Decoration

Bottle-cap aluminum must provide a clean and stable substrate for lacquer, color coating and compatible decoration processes. Surface contamination, rolling marks or inconsistent pretreatment can affect coating adhesion and finished appearance.

Lightweight Packaging Material

Aluminum provides low weight together with useful strength for closures, helping packaging manufacturers produce thin, formable cap shells with a consistent decorative finish.

Discuss Your Bottle Cap Specification

Critical Quality Requirements for Closure Stock

Low Earing During Drawing

During deep drawing, uneven material flow can create ears around the upper edge of the cap shell. Excessive earing increases trimming waste and can affect finished cap height. Buyers producing long or deeply drawn closures should therefore specify and verify the acceptable earing level.

Thickness Consistency

Stable gauge helps maintain drawing behavior, cap wall thickness, thread geometry and finished closure weight. Required thickness tolerance should be specified according to the cap tooling and production speed.

Flatness and Coil Shape

Good flatness helps material feed smoothly through coating, printing, blanking and high-speed cap-forming equipment. Edge wave, center buckle or unstable coil shape can affect registration and automatic feeding.

Clean Surface

Closure stock should be checked for oil contamination, black lines, scratches, rolling marks, dents and embedded particles that could affect coating, printing or the appearance of finished caps.

Stable Mechanical Properties

Tensile strength, elongation and temper consistency affect blanking, drawing, curling and threading. For high-speed multi-cavity production, these properties should remain stable throughout the coil and between production batches.

Food-Contact Lacquer for Bottle Caps

For bottle caps used with beverages or food products, the lacquer system should be selected according to the exact packaged product and service conditions. Different beverages, oils, acidic products and alcohol-containing products can place different demands on the internal coating.

The buyer should specify whether the coating will contact the packaged product directly, together with the destination market, filling temperature, pasteurization or sterilization conditions and required compliance documentation.

The use of a coating described as food-contact or food-grade should be supported by documentation for the exact lacquer formulation and intended conditions of use. A general paint-performance test does not by itself establish food-contact compliance.

White Epoxy Lacquer

White epoxy lacquer can be discussed for closure applications requiring a white finished surface or suitable protective coating. The required coat weight, cure condition, chemical resistance and forming performance should be agreed before mass production.

Internal and External Coating

The product side and decorative side can require different coating constructions. Buyers should identify which side will contact the packaged product and which side will be printed, colored or otherwise decorated.

Roller-Coated Aluminum Paint Performance Reference

The following table retains the general coating-performance data associated with the existing roller-coated aluminum product range. These values are useful as coating references but should not be interpreted as food-contact certification for a specific bottle-cap lacquer.

Coating Flexibility During Cap Forming

Closure coating must tolerate deformation together with the aluminum substrate. During drawing, curling and threading, the lacquer can experience stretching and bending that may expose weaknesses in adhesion or cure.

T-bend, impact and adhesion tests can provide useful coating references, but actual closure-forming trials should be carried out when introducing a new lacquer, thickness, cap height or tooling configuration.

After trial forming, inspect the drawn wall, upper edge, curl, thread and pilfer-band areas for coating cracking, peeling, whitening or exposed aluminum.

8011 H14 Aluminum for ROPP and Screw Closures

8011-H14 can be used as raw material for suitable Roll-On Pilfer-Proof and screw-closure constructions. These caps are typically produced through blanking and drawing before the finished closure receives knurling, thread formation and tamper-evident features.

For long or deeply drawn closures, earing and elongation become particularly important because uneven material flow increases trimming and can create inconsistent skirt height.

Provide the finished cap dimensions, drawing depth and tooling requirements when requesting material for a new closure design.

Send Your Cap Drawing for Material Review

Typical Applications

• Beverage bottle caps

• Water and soft-drink closures

• Wine and spirits screw caps

• ROPP and pilfer-proof closures

• Metal lug closures

• Pull-ring packaging components

• Food and beverage closure components

• Other stamped and coated aluminum packaging closures

White Coating and Printing Considerations

A white coated surface can be used as the finished closure appearance or as a base for compatible decoration. Where printing, logo decoration or over-varnishing is required, the surface construction should be matched to the ink and curing process used by the cap converter.

Color, gloss and coating cure should be controlled to help maintain consistent appearance across large production batches. Buyers should provide an approved color reference or physical sample for repeat branded packaging.

Printing compatibility should be validated before mass production because ink adhesion depends on the lacquer chemistry, surface treatment, cure condition and printing system.

Quality Checks Before Bottle Cap Production

Verify Thickness and Width

Check coil or sheet thickness and width against the approved specification before production. Stable dimensions support consistent blank size and smooth feeding through automatic cap-making equipment.

Inspect Flatness and Coil Shape

Check for edge wave, center buckle, camber and other shape deviations that may interfere with printing, slitting or automatic feeding.

Inspect Surface Cleanliness

Inspect the coated surface for scratches, pinholes, stains, dirt inclusions, coating defects and contamination that could affect appearance or closure performance.

Check Lacquer Adhesion and Cure

Confirm coating adhesion, cure and resistance according to the agreed lacquer specification before the material is released for cap forming.

Run a Forming Trial

For a new cap design or coating system, trial the material using the intended blanking and forming tools. Check cap height, earing, cracking, coating condition and final geometry before approving bulk production.

How to Select 8011 H14 Closure Stock

1. Confirm the Closure Type

Specify whether the aluminum will be used for a screw cap, ROPP closure, lug closure, pull-ring component or another packaging part. Cap geometry determines the forming requirements.

2. Confirm Cap Dimensions and Drawing Depth

Provide cap diameter, height, skirt length and any deep-drawing requirement. Long closures generally place greater demands on elongation and earing control.

3. Select Thickness

The current listed product range is 0.22–0.50 mm. Select the actual gauge according to cap diameter, height, required rigidity and forming process.

4. Confirm Material Width

The current product specification lists 800–1500 mm. Final master-coil or sheet width should be matched to the buyer's slitting, printing and blanking process.

5. Specify Internal and External Coatings

State the required internal lacquer, exterior white or colored finish, coating side, film requirements and any subsequent printing or decoration process.

6. Specify Food-Contact Conditions

For food or beverage closures, identify the packaged product, destination market, filling conditions and required documentation so the appropriate coating system can be reviewed.

7. Confirm Printing and Decoration

If the material will be printed after delivery, provide the printing and curing process so surface compatibility can be evaluated.

Ordering and Export Packing

Send Your Bottle Cap Aluminum Specification

Frequently Asked Questions

What is 8011 H14 aluminum closure sheet?

It is aluminum closure stock made from AA8011 in H14 temper for forming suitable bottle caps and metal closures. The material provides a balance between strength and formability for compatible stamping and drawing operations.

Why is 8011-H14 used for bottle caps?

8011-H14 can provide useful forming performance together with sufficient rigidity for bottle-cap shells. Stable mechanical properties, good flatness and controlled earing are important for repeatable cap production.

What thickness range is available?

The current product specification lists 0.22–0.50 mm. Final thickness should be selected according to cap diameter, height, drawing depth and required finished rigidity.

What width can you supply?

The current product specification lists 800–1500 mm. Final width should be confirmed according to the buyer's printing, slitting and cap-forming process.

Is 8011 H14 suitable for ROPP caps?

It can be used for suitable ROPP and screw-cap constructions. For long or deeply drawn closures, the required elongation, earing, thickness and forming performance should be confirmed against the actual cap design.

Why is low earing important for bottle caps?

Low earing helps maintain a more uniform skirt height after drawing, reducing trimming waste and supporting consistent cap geometry. The required maximum earing value should be stated in the purchase specification where it is critical.

Can white epoxy coating be supplied?

White epoxy lacquer is listed within the current product information. The exact formulation, film requirement, coating side and end-use documentation should be confirmed before production.

Is the coating automatically suitable for food contact?

No coating should be assumed suitable for every food-contact application without reviewing its documentation. Suitability depends on the exact lacquer, packaged product, contact side, filling conditions, processing temperature and destination-market requirements.

Can the coated aluminum be printed?

Printing can be evaluated on an appropriate coated surface, but compatibility should be confirmed with the intended ink, printing method and curing process before mass production.

What defects should be checked before cap production?

Check flatness, thickness, width, scratches, coating defects, contamination, edge condition and coil shape. For new closures, forming performance and earing should also be evaluated using the intended tooling.

Can other alloys such as 5182 or 5052 be supplied?

5182 and 5052 are listed as alternative alloys within the product range. Their suitability should be reviewed separately according to the specific closure or packaging component rather than treated as direct substitutes for every 8011-H14 application.

What is the minimum order quantity?

The current product specification lists a minimum order quantity of 2,000 kg. Final MOQ can depend on alloy, dimensions, lacquer system and color requirements.

How is the material packed for export?

The listed packing method is seaworthy export packing with wooden pallets. Protective wrapping should keep the coated surface dry and reduce handling damage during transportation.

What information should I provide for a quotation?

Please provide alloy, temper, thickness, width, cap dimensions, drawing depth, lacquer system, coating side, color, printing requirement, packaged product, food-contact requirements, order quantity and destination.

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