Colored ROPP Aluminum Caps

Colored ROPP aluminum caps (Roll-On Pilfer Proof Cap) are aluminum tamper-evident bottle closures widely used in the beverage, food, and pharmaceutical industries. Their colored appearance is mainly achieved through surface treatment technologies.

What are colored ROPP aluminum caps?

These closures are made from aluminum and utilize a roll-on process that crimps them onto bottle necks. The design includes a tear-off band, which provides tamper evidence—when you unscrew the cap, the band remains on the bottle to signal it’s been opened.

Colored ROPP (Roll-On Pilfer Proof) aluminum caps are designed to provide tamper-evident security and product integrity for bottled goods. These aluminum caps are made from high-grade aluminum alloy (commonly 8011) and are applied to the bottle neck using specialized capping machines. During use, the skirt of the aluminum cap tightly conforms to the bottle’s threads, forming a permanently frangible seal that clearly indicates any tampering. The addition of color helps with brand differentiation while retaining all the functional advantages of standard ROPP aluminum caps.

Colored ROPP Aluminum Caps Colors and Finishes

Common finishes: silver, gold, black, white, red, blue, green, yellow; and virtually any custom color or metallic finish (e.g., polished, matte, painted) .
Fabrication: Colors are achieved via coatings, anodizing, or printing techniques like silk-screen, UV, hot-stamp, embossing/debossing to fit branding needs .

Coloring Technology

Flat printing: Multi-color overprinting enables complex patterns, suitable for brand logos. Special effects: Emboss printing, hot stamping, and silk-screen printing enhance texture; milled caps can be engraved with text or codes. Spray coating: Uniform coloring is achieved through electrophoretic coating or powder spraying, with some using anodizing to enhance durability.

Customization Capability

Supports personalized color matching and special surface treatments (such as brushed matte finishes) to meet fashion demands.

The caps can be painted or coated

Gold/Yellow: 5–6 g/m² coating (double-sided)
White/Red/Black/Blue: 10–13 g/m² coating.
Glossy/Matte finish: Achieved through polishing or anodizing.

Colored ROPP Aluminum Caps Quick Specs Table

Feature	Typical Values
Materials	Aluminum (8011 alloy common)
Colors	Silver, gold, red, blue, green, black, white, custom
Sizes	18 mm → 53 mm necks; height ~12–20 mm
Liners	PE, butyl, silicone, EPE
Tamper Evident Mechanism	Drop ring detaches when opened
Printable Options	Silk-screen, UV, hot-foil, emboss/deboss
Order Quantity	~10k–200k+ units per order

Material Composition of Colored ROPP Aluminum Caps

Cap Shell: Stamped from aluminum alloy material, featuring corrosion resistance and infinite recyclability.
Liner: Made from non-PVC materials (such as food-grade silicone or molded gaskets), ensuring tight sealing and high-temperature sterilization resistance.
Tamper-Evident Band: Separates from the cap body after opening (breakaway type) or remains connected via bridges (bridge type), providing tamper-evident protection.

8011 Aluminum Alloy: Widely used due to its excellent formability, corrosion resistance, and compliance with FDA/EC food contact regulations. It contains 97.3–98.9% aluminum, 0.6–1% iron, and 0.5–0.9% silicon to enhance strength.

Sizes and Specifications of Colored ROPP Aluminum Caps

HC Aluminum offers caps in various standard sizes, typically including:

Small spirit bottle caps, such as 18×12 mm and 28×18 mm for miniature bottles,
and 53 mm large caps for oils or bulk liquids.

Liners and Sealing of Colored ROPP Aluminum Caps

Common liners include polyethylene (PE), silicone rubber, butyl rubber, or expanded polyethylene (EPE).

These liners ensure a tight, leak-proof seal and are compatible with a variety of contents (e.g., syrups, oils, spirits, pharmaceuticals).

Liner Type	Applications	Properties
PE (Polyethylene)	Water, juices	Moisture resistance
Silicone Rubber	Pharmaceuticals, syrups	High-temperature stability
Butyl Rubber	Spirits, volatile liquids	Superior gas barrier

Colored ROPP Aluminum Caps Standard Dimensions (mm)

Size (Ø)	Inner Diameter (Min–Max)	Height (Min–Max)	Common Colors
18mm	18.25–18.25	12–13	Silver, Gold
20mm	22.1–22.5	15.5	Silver
28mm	28.1–28.8	17.5–18.4	Silver, Black, Red, Custom
30mm	30.0–30.0	60.0	Customizable
38mm	38.0–39.0	15.7–21.5	Silver, Golden

Features and Applications of Colored ROPP Aluminum Caps

Tamper-evident: Equipped with a breakaway ring that fractures upon first opening.
Durable and Corrosion-resistant: Aluminum construction offers strong protection and a premium appearance.
Machine-Compatible: Suitable for single-head and multi-head capping machines.
Customizable: Logo printing, embossing, liner selection, and specification of colors or surface finishes available.
Bulk Supply: Typically sold in large quantities (e.g., 16, 000 pieces per case or minimum order of 50, 000–200, 000 units).

Performance Advantages of Colored ROPP Aluminum Caps

Sealing and Protection

Excellent airtightness, effectively isolating oxygen and moisture to extend shelf life.

Liners are heat-resistant (sterilizable at up to 121°C), non-deforming, and odorless.

Ease of Use

Torque-controlled opening design for easy unscrewing and resealing.

Compatible with glass/PET bottle necks and suitable for both recyclable and disposable containers.

Eco-Friendliness and Cost Efficiency

Aluminum is 100% recyclable, aligning with green packaging trends.

High production efficiency and large-scale manufacturing reduce costs.

Applications of Colored ROPP Aluminum Caps

Beverages: Mineral water, wine, functional drinks (e.g., 28mm tamper-evident caps, 30×60mm wine closures).
Pharmaceuticals: Oral liquid bottles, health supplements (requiring high-temp sterilization and anti-counterfeit design).
Food: Glass bottle packaging for olive oil and condiments.

Industry	Application Scenario	Common Sizes (Diameter)	Liner Type
Beverages	Miniature spirits, wine, syrups, health drinks	18 mm, 28–31.5 mm	PE/EPE liner
Pharmaceuticals	Oral liquid bottles, syrup containers	20–28 mm	Silicone liner
Food & Oils	Edible oil bottles	38–53 mm	Butyl rubber liner
Cosmetics	Perfume bottles (custom packaging)	22–25 mm	Custom-colored cap + PE liner

Customization Options for Colored ROPP Aluminum Caps

Logos and brand markings via printing or embossing
Custom color matching to perfectly align with brand tones
Surface finish styles: matte, glossy, metallic sheen
Variety of liner materials to suit different types of liquids
Size adjustment according to bottle neck threads

Colored ROPP aluminum caps are versatile, secure, and highly customizable—ideal for industries such as beverages, pharmaceuticals, and cosmetics. They are lightweight, durable, and combine tamper-evidence, tight sealing, and brand exposure in one solution.

Colored ROPP aluminum caps integrate safety, branding appeal, and functionality, making them indispensable for premium packaging solutions. Their adaptability in color, size, and liner configuration suits a wide range of industry needs.

The following bottle caps may interest you