In the beverage packaging industry, a small 38mm diameter component—the aluminum bottle cap—is quietly driving a technological revolution and an eco-friendly transformation. From Coca-Cola's new dairy drinks to the premium designs of craft beer, this seemingly simple product is reshaping the boundaries of beverage packaging with its high strength, excellent sealing performance, and advanced customization features.
What is a 38mm Aluminum ROPP Cap?
38mm refers to the outer diameter of the cap, a medium-size specification. It typically includes a pilfer-proof ring and is widely used in the packaging of glass, PET, and PP bottles for products such as chilled juices, sports drinks, dairy beverages, teas, and nutritional drinks.
38mm Aluminum ROPP Cap Specifications
| Name | 38mm Aluminum Ropp Cap |
| Diameter | 38mm |
| Height | Customizable |
| Material | Aluminum 8011 H14 |
| Thickness | 0.22mm ± 0.015mm |
| Type | ROPP Cap |
| Liner Options | PE liner, tinfoil liner, saran liner, etc. |
| Decoration | Top: Lithographic printing, embossing and knurling, UV printing, hot stamping, silk screen printing |
| Side: Multi-color offset printing, embossing and knurling, UV printing, hot stamping, silk screen printing | |
| Colors | White, black, red, gold, or customizable |
| Use | Bottles |
| Characteristic | Pilfer-proof |
| Customization | Accepted |
| Place of Origin | China |
| Packaging | Box + pallet |
| MOQ | 50,000 pieces |
Key Advantages of the 38mm Aluminum ROPP Cap
Excellent Sealing Performance: Advanced sealing technology effectively blocks air, moisture, and bacteria to preserve freshness and safety. Ideal for oxidation-sensitive products like juice and dairy beverages.
Lightweight & Eco-Friendly: High recyclability and low transport energy consumption make aluminum caps a sustainable choice, offering a greener alternative to plastic.
Premium Appearance & Branding: The metallic luster of aluminum enhances product value. Various surface decoration options enable personalized branding and improve recognition.
Anti-Counterfeiting & Tamper Evident: Designed to prevent refilling and counterfeiting, with visible opening traces to ensure safety and consumer trust.
Corrosion Resistance: The natural oxide layer of aluminum provides durability even in humid or acidic environments, preventing rust.
Consumer-Friendly Experience: Easy-to-open design improves usability and enhances the overall drinking experience.
Purchasing Recommendations:
Confirm bottle thread specifications (e.g., 38/400, 38mm ROPP) to ensure precise compatibility.
Choose suppliers with food-grade certifications (such as ISO22000, FDA).
Test sample sealing performance, especially resistance to thermal processing and cold-chain logistics.
Plan custom design in advance, including mold lead time and printing details.
HAOMEI Aluminum is a professional bottle cap manufacturer that exports aluminum pilfer-proof and aluminum-plastic bottle caps to many well-known brands worldwide. It offers 28mm and 38mm custom aluminum caps made from aluminum and plastic. These caps can be customized with a variety of decorations such as embossing, UV printing, hot stamping, and silk screen printing. Advantages include easy opening, tamper-evident design, airtight sealing, customization flexibility, and cost efficiency.
