22mm Aluminium Ropp Caps

HC Aluminum specializes in providing 22mm ROPP bottle caps, which are suitable for use in the beverage, chemical, cosmetics, food processing, and pharmaceutical industries as closures for sealing bottles and containers. The ROPP caps we offer come in a variety of sizes and shapes and can be customized according to customer requirements. All ROPP caps are tested by our quality experts to ensure flawless performance.

ROPP (Roll On Pilfer Proof) caps are roll-on tamper-evident closures designed to provide secure sealing and tamper protection, widely used in the packaging industry.

The 22mm aluminum ROPP cap is a high-performance tamper-evident sealing solution that combines the strength of aluminum with the tamper-proof features of ROPP design, making it especially suitable for small-sized, high-end packaging needs.

ROPP caps are formed using a roll-forming technique that presses tamper-evident ring patterns onto the bottle neck, ensuring irreversibility once opened and preventing malicious tampering. These caps offer excellent sealing, tamper resistance, and durability, making them ideal for packaging scenarios with high-security standards. The aluminum version is primarily made of aluminum alloy and incorporates plastic components (such as liners), balancing lightweight properties with corrosion resistance.

The 22mm aluminum ROPP (Roll-On Pilfer Proof) cap is a standard size for tamper-evident screw caps used on small and medium bottles, widely applied in pharmaceutical, cosmetic, food & beverage, and liquor packaging.

ROPP Aluminium 22 mm Bottle Caps Product Details

The 22mm diameter is one of the standard specifications for ROPP caps, suitable for small bottle containers. This size typically corresponds to the bottle mouth’s inner diameter to ensure a tight fit and reliable seal. Related sizes such as 20mm or 28mm aluminum-plastic caps are also common, with 22mm often used in small-dose pharmaceutical or beverage packaging.

Color	White, Black, Silver, Gold, or customized colors, with optional logos or brand markings
Material	Aluminum
Size/Dimension	22 mm
Decoration Method	Lithographic printing, embossing, hot stamping, UV ink or offset printing, etc.
Packaging Size	10, 000 Pcs
Packaging Type	Carton
Liner Thickness	EPE/Rubber/Silicone/Butyl Rubber (1.5–1.8 mm)

Product Specification Data

Inner Diameter (A) Max: 22.5 mm
Inner Diameter (A) Min: 22.1 mm
Outer Diameter (B) Max: 22.9 mm
Outer Diameter (B) Min: 22.5 mm
Maximum Height (C): 15.5 mm
Minimum Height (C): 14.7 mm

Customization

Colors: Standard silver/gold; customizable colors (red, blue, black)
Printing: Logo/text via flexographic or screen printing

ROPP Aluminium 22 mm Bottle Caps Materials and Manufacturing

‌Aluminum Cap Component‌: Mainly formed by stamping high-strength aluminum alloy sheets, with dual coating treatment to enhance corrosion resistance and surface finish.
‌Plastic Cap Components‌: Typically made from polypropylene (PP) and color masterbatch via injection molding, supporting customized colors and textures to meet branding needs.

The manufacturing process involves precision tooling (such as stamping molds) to ensure dimensional accuracy and batch consistency.

ROPP Aluminium 22 mm Bottle Caps are made from high-quality aluminum materials (typically 8011 H14 or 3105 H16 alloy)

Sheet Thickness: 0.18–0.20 mm; Inner liner made of inert EPE (Expanded Polyethylene) or foam lining (approx. 1.5–1.8 mm), ensuring sealing performance and chemical resistance.

22mm Aluminium Ropp Caps Features

Tamper Evident: The lower ring detaches upon opening, leaving a visible tamper mark.

Leak-Proof: No leakage during inverted testing.

Chemical Resistance:

The liner prevents leaching of solvents like isopropanol (tested over 24 hours).
Aluminum body resists acid and alkali corrosion.

‌Sealing Performance‌: Securely seals the contents, preventing leakage or deterioration, especially suitable for liquid products.

‌Tamper-Proof Design‌: The tamper-evident ring breaks upon opening, offering anti-counterfeit and tamper-resistant protection.

‌Aesthetic & Customization‌: The plastic cap portion can be colored or printed with logos to enhance product identification; the overall design is single-use, meeting hygiene standards.

‌Applicability‌: Especially suitable for high-demand environments such as pharmaceutical or functional beverage packaging, capable of withstanding physical stress during transport.

Sealing & Tamper Evident

Tamper-evident perforated ring with a clear break mark; upon first opening, the ring detaches or shows obvious damage.
Provides reliable airtight sealing even when inverted.
Aluminum is chemically inert, making it safe for liquids, syrups, pharmaceuticals, oils, and cosmetics.

22mm Aluminium Ropp Caps Industry Applications‌

22mm aluminum ROPP caps are mainly used in small bottle packaging sectors:

‌‌Beverage Industry‌: Suitable for small-capacity beverage bottles such as functional drinks or oral solution bottles, providing tamper-proof protection.
Pharmaceutical Packaging‌: Used for medicine or solution bottles, ensuring sealing integrity and compliance with safety certification requirements.

Industry Application	Specific Uses	Advantages
Spirits and Beverages	Wine, White Liquor	Provides secure tamper-evident protection
Pharmaceutical Bottles	Syrups, Tablets, Capsules	Ensures sterility and tamper resistance
Cosmetics and Oils	Essential oils, beauty products	Prevents leakage and maintains product integrity
Fast-Moving Consumer Goods (FMCG)	Essential oils, Condiments	Easy to open and reseal

HC Aluminum 22mm Ropp Caps Quality and Standards

HC Aluminum conducts rigorous inspections throughout the production process:

‌Appearance & Dimensions‌: Checks for surface flatness and dimensional deviations (e.g., diameter tolerance) to ensure consistency of the 22mm specification.
‌Performance Testing‌: Includes tensile strength, airtightness (e.g., air pressure method), and leakage resistance assessments to meet industry standards.

Testing Protocols:

Dimensional inspection (height, diameter, thickness)
Torque application to ensure thread integrity during opening/closing
Leakage testing under inverted conditions
Shelf Life: Liners help prevent evaporation, extending product stability

Why Choose 22mm Aluminium Ropp Caps?

This size matches the standard necks of many medicine bottles and specialty beverage bottles, making it ideal for mass production using ROPP machinery. It strikes a balance between strength, aesthetics, and compliance, making it a versatile choice.

These caps are made of high-quality aluminum and are perfect for sealing various sizes of glass bottles. Our ROPP caps are suitable for different types of bottles and can be easily customized with your desired logo or design. Not only are our ROPP caps visually appealing, but they also provide a secure seal to prevent any leakage or contamination.

The 22mm aluminum ROPP cap is a multifunctional tamper-evident closure solution, essential for industries focused on product safety and regulatory compliance. Its key advantages include customizable designs, stringent leak-proof performance, and compatibility with glass/plastic bottles.

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