As the packaging industry demands higher standards for sealing, safety, and aesthetics, the 31.5x24mm gold aluminum ROPP cap has become a widely used high-quality tamper-evident bottle cap in premium spirits, olive oil, high-end beverages, and health product packaging.
Also known as aluminum tamper-evident caps, rolled-on tamper-proof caps, or aluminum screw caps, ROPP caps are manufactured by pressing the threads directly onto the bottle mouth using rolling equipment. This ensures a precise fit between cap and bottle while incorporating a tamper-evident ring that breaks upon first opening, providing anti-theft and tamper-proof functionality.
The 31.5x24mm aluminum cap fits a wide range of bottles, including PET bottles, 250–750ml glass wine bottles, olive oil bottles, and more. Its versatility and excellent sealing performance make it especially suitable for mainstream bottle types in Europe, Southeast Asia, and the Middle East.
Product Information
| Diameter | 31.5 mm |
| Height | 24 mm |
| Material | 8011 / 3105 / 3003 aluminum alloy |
| Surface Color | Gold (custom paint available) |
| Liner Type | EPE, Saranex, TPE, aluminum foil composite gasket |
| Process | Stamping, deep drawing, anodizing, painting, printing |
| Tamper-Evident Structure | Breakable tamper ring |
| Compatible Bottle Types | Wine bottles, oil bottles, medicine bottles, etc. |
| Samples | Available |
| Packaging | Cartons + wooden pallet |
| MOQ | 80,000 pcs |
Why Choose 31.5*24mm Gold Aluminum ROPP Caps?
1. Excellent Sealing Performance
Carefully controlled liner materials and precise cap structure ensure a leak-proof seal between the bottle mouth and the cap. This is critical for high-value liquids such as spirits and essential oils, effectively preventing evaporation and leakage.
2. Perfect Tamper-Evident & Anti-Counterfeit
During capping, the ROPP cap threads are rolled and pressed onto the bottle while forming a tamper-evident ring at the skirt base. The ring only breaks upon first opening, providing visible evidence of tampering and protecting product integrity.
3. Luxurious Appearance & Brand Enhancement
The brilliant gold finish instantly conveys a sense of luxury and quality. It attracts consumer attention and acts as a silent ambassador for your brand image.
4. Durable & User-Friendly
Aluminum is lightweight yet sturdy, with excellent corrosion resistance, protecting the product during transport and storage. The standard thread design ensures easy opening and reliable re-sealing, providing an excellent user experience.
Application Areas
Premium Alcoholic Beverages: Spirits, liqueurs, craft beers, premium olive oil, vinegar, etc.
Cosmetics & Perfumes: Essential oils, perfumes, high-end skincare liquids, serums, etc.
Health Products & Pharmaceuticals: Nutritional supplements, medicinal reagents, and other products requiring high sealing performance.
Chemical & Specialty Products: Special chemicals where sealing and anti-counterfeiting are critical.
Customization Options
Top/Skirt Printing: Supports high-definition multi-color offset or screen printing. Customizable with brand logos, slogans, or special patterns.
Embossing: Embossed logos on the cap top to enhance tactile feel and anti-counterfeit effects.
Side Knurling: Improves grip on the cap edge, making it easier for consumers to open.
