Aluminum ROPP Caps (Roll-On Pilfer-Proof Caps) are precision-engineered, roll-formed tamper-evident closures widely used in spirits, pharmaceuticals, beverages, olive oil, condiments, and other bottled products.
Their core advantages include strong tamper-evidence, anti-counterfeiting capability, excellent sealing performance, and the ability to be attractively printed.
In the alcoholic beverage industry, they are used to seal spirits, wines, and beers, ensuring product integrity and deterring counterfeiting. In pharmaceuticals, they provide sterile, secure sealing for syrups and liquid medicines. The food industry uses standard ROPP seals for edible oils and vinegars, combining reliable sealing with easy resealing.
Tamper-Evident Features
1. Tear-Off Strip / Safety Ring:
Requires pulling or tearing a pre-scored metal strip or ring during first opening. Once removed, it cannot be restored, clearly indicating the bottle has been opened.
2. Breakable Bridges:
Small metal bridges between the cap top and sidewall break during opening, providing both visual and physical evidence of tampering.
3. Bottle Neck Locking Flange:
After roll-on forming, the cap’s bottom edge crimps under the bottle’s locking flange, creating a firm, secure fit that can only be released by breaking the safety ring.
Product Specifications
| Product Name | Tamper-Evident Aluminum ROPP Cap |
| Material | Aluminum |
| Sizes | 15 mm, 18 mm, 28 mm, 30 mm, 31.5 mm, 33 mm, 38 mm, etc. |
| Height | Customizable |
| Popular Sizes | 25 X 16 mm, 25 X 42 mm, 28 X 15.5 mm, 28 X 18 mm, 30 X 45 mm, 31.5 X 44 mm, 30 X60 mm |
| Colors | Gold, black, red, blue, or any custom color |
| Styles | Knurled edge, smooth edge |
| Liners | PE liner, tin foil liner, PE liner with QR code, etc. |
| Cap Markings | Embossing, printing, laser engraving |
| Other Labels | Stickers included in inner packaging |
| Packaging | Paper reels (or plastic reels, plastic bags, boxes, printed cartons) |
Multi-Specification Products for Diverse Industries
To meet the market’s wide range of bottle types and capacities, professional manufacturers now mass-produce tamper-evident aluminum ROPP closure in mainstream diameters including 15 mm, 18 mm, 28 mm, 30 mm, 31.5 mm, 33 mm, and 38 mm.
These closures suit both glass and plastic bottles. Selecting the right size is critical to ensure the cap rolls on properly, seals tightly, and delivers its tamper-evident function.
Typical Applications:
15 mm / 18 mm:
Primarily for perfumes, essential oils, and small-dose pharmaceuticals in compact glass bottles with secure sealing.28 mm:
Ideal for mineral water, carbonated drinks, juices, and small bottled edible oils; compatible with plastic and glass bottle necks.30 mm / 31.5 mm:
The classic choice for wine, spirits, olive oil, and premium condiments, supporting high-top and short-top styles.33 mm / 38 mm:
For wide-mouth bottles like edible oil, powder cans, and pharmaceutical/nutritional tins, designed to accommodate liner inserts.Manufacturers typically offer full custom services, including size design, tamper-evident ring structure, bottle neck thread specifications, exterior printing, and interior coating solutions.
FAQ
Q1: How do you ensure production quality?
A1: We strictly implement ISO and food safety quality management systems, with multiple inspection stages to ensure precise dimensions, secure tamper-evident rings, uniform coatings, and clear printing for every batch.
Q2: Do you offer customization?
A2: HAOMEI Aluminum provides a wide range of custom services, including size design, bottle neck threading, liner materials, exterior printing, and packaging solutions to meet different customer needs.
Q3: What is your production capacity and lead time?
A3: We have large-scale production capacity with multiple automated lines, capable of producing hundreds of millions of ROPP caps annually. Standard sizes are available in stock or with short production lead times, and custom orders can be reliably delivered within 25–35 days as agreed.
Q4: Can I get samples? What is the MOQ?
A4: Yes! We can provide free samples for testing upon request. We support flexible minimum order quantities, including small trial batches and mass production. Please contact us (WhatsApp: +8618703635966) to get the latest MOQ and pricing information.
Q5: Do you support export orders?
A5: Absolutely! HAOMEI Aluminum has extensive export experience to over 40 countries and regions. We support FOB, CIF, DDP, and other trade terms and can provide all necessary documents such as customs clearance papers, test reports, certificates of origin, and MSDS.
