28x18mm Aluminium Ropp Cap

The 28x18mm Aluminium ROPP (Roll-On Pilfer-Proof) cap is a precision sealing solution widely used in the food, beverage, alcoholic, and pharmaceutical industries. Its name is derived from its size specifications (diameter 28mm, height 18mm) and material properties (aluminium), combined with ROPP technology, making it a high-end packaging choice that combines functionality, safety, and aesthetics.

HC Cap Manufacturing Co., Ltd. has over 17 years of experience in providing various aluminium caps, plastic caps, aluminium-plastic caps, glass bottles, and other packaging products. Our products are exported to over 20 countries worldwide, including the United States, Europe, South Africa, Southeast Asia, and more.

28x18mm Aluminium Ropp Cap Specifications

Specification Information	Description
Size & Specifications	Diameter: 28mm; Height: 18mm; Suitable for standard bottle mouth specifications, ensuring a tight fit of the cap.
Material	Made from high-quality aluminium, offering excellent corrosion resistance and oxidation resistance, extending the product's service life and ensuring the sealing effect is unaffected by environmental factors.
Liner Material	- EPE liner: Commonly used for cold-filled products, providing effective airtightness. - PE liner: Suitable for general beverage bottle sealing, enhancing sealing and leak-proof performance. - PVC - Silicone rubber or Butyl rubber liner: Suitable for bottled products that require higher sealing performance and tamper-proof functionality.
Colors & Customization	Provides a variety of color options, supports personalized customization according to customer needs, including printing logos, brand information, or specific designs to enhance brand recognition.
Safety Design	Adopts the ROPP (Roll-On Pilfer-Proof) design, ensuring that the cap cannot be restored once opened, providing effective tamper-proof and theft protection.
Application Range	Widely used for sealing bottled products such as water, beer, wine, soft drinks, energy drinks, pharmaceutical products, etc., ensuring liquid leakage is prevented, and maintaining the product's freshness and safety.
Packaging & Quantity	Each box contains 4, 500 caps, suitable for mass production and bulk purchasing.

28x18mm Aluminium Ropp Cap Structure & Process

Material: The 28x18mm Aluminium ROPP Cap is made of high-purity aluminium, offering lightweight, corrosion-resistant, and oxidation-resistant characteristics, which can protect the contents from environmental factors (such as humidity, light, oxygen) over the long term.

Process:

Roll-on Forming: Through automated equipment, the aluminium cap is rolled onto the bottle mouth thread, forming a tight fit to ensure sealing.
Pilfer-Proof Ring Design: When the cap is opened, the pilfer-proof ring at the bottom separates from the cap body and remains on the bottle mouth, providing visual tamper-evidence, preventing re-filling or illegal opening.
Liner: Some models are equipped with food-grade or pharmaceutical-grade elastic liners (such as PVC, PE, or polyester films), further enhancing the sealing effect to accommodate different liquid properties (e.g., carbonated beverages require pressure-resistant liners).

28x18mm Aluminium Ropp Cap Features

Features	Description
Excellent Sealability	The combination of aluminum's ductility and the rolling process ensures a seamless fit between the bottle mouth and cap, effectively blocking oxygen, moisture, and contaminants, extending the product's shelf life.
Anti-theft and Anti-counterfeit Function	The breakable anti-theft ring design provides a clear indication of whether the product has been opened, preventing tampering during distribution, and meeting the stringent security requirements of pharmaceuticals and premium alcoholic beverages.
Corrosion Resistance	The aluminum surface can be enhanced with oxidation or coating processes to improve chemical corrosion resistance, suitable for acidic beverages, alcoholic products, and some pharmaceuticals.
Custom Design	Appearance: Supports high-precision printing, hot stamping, laser engraving, and other processes, with customizable brand logos, patterns, or anti-counterfeit codes. Colors: Offers a variety of anodized or spray-coated color options to meet brand visual recognition needs.
Environmental Compatibility	Aluminum is 100% recyclable, aligning with global sustainable packaging trends and helping companies fulfill their environmental responsibilities.

28x18mm Aluminium Ropp Cap Typical Applications

Application	Description
Alcohol	Bottled drinks such as wine, spirits, and craft beer require high sealing performance to ensure the lasting and pure flavor. The 28x18mm aluminum ROPP cap, with its excellent sealing, ensures that alcoholic products are unaffected by oxidation during storage and transportation, maintaining their original flavor. Additionally, the anti-theft design effectively prevents tampering, protecting consumer rights, especially in the premium alcoholic beverage market, meeting strict safety and anti-counterfeit requirements.
Beverages	Beverages such as juices, carbonated drinks, and premium mineral water often have certain gas pressure or acidity, requiring the cap to have strong sealing and pressure resistance. The 28x18mm aluminum ROPP cap adopts a pressure-resistant liner technology that can meet the needs of carbonated liquids, preventing leakage or quality damage during transportation or storage, ensuring that the taste and quality of the beverage remain unchanged.
Pharmaceuticals	Pharmaceutical products such as oral liquids, syrups, and disinfectants have very high hygiene requirements for packaging, ensuring tight sealing and sterility. The 28x18mm aluminum ROPP cap uses advanced sealing designs to effectively isolate the external environment, ensuring that the product remains uncontaminated during transportation and storage. Additionally, it complies with international pharmaceutical packaging regulations (e.g., FDA, EU GMP), providing safe and reliable packaging solutions for the pharmaceutical industry, protecting consumer health and product quality.
Cosmetics/Personal Care	Liquid cosmetics and personal care products such as perfumes and essential oils require extremely high sealing to prevent evaporation or external contamination. The 28x18mm aluminum ROPP cap, through precise sealing technology, effectively protects liquid products from oxidation, extending their shelf life. At the same time, the high-quality design of the cap enhances the overall appearance of the product, meeting the refined packaging requirements of the premium cosmetics market and enhancing brand image.

28x18mm Aluminium Ropp Cap Compatibility and Adaptability

Bottle Mouth Specifications: Compatible with international standard 28mm threaded bottle mouths (e.g., 28-400, 28-410), suitable for glass, PET, and some special material bottles. Automated Production Lines: Designed to be compatible with high-speed filling lines, supporting packaging speeds of hundreds to thousands of caps per minute, reducing production costs.

28x18mm Aluminium Ropp Cap Advantages

Dimension	Advantages
Safety	Anti-theft ring design + irreversible opening mechanism, eliminating the risk of product tampering.
Shelf Life Assurance	Aluminum’s oxidation resistance + elastic liner, effectively blocking external environmental impact on the contents.
Brand Value	Customized appearance enhances product quality, increasing shelf appeal and consumer trust.
Cost Effectiveness	Lightweight design reduces transportation costs, high yield rate and automation compatibility reduce production losses.

Purchasing Recommendations

When selecting 28x18mm aluminum ROPP caps, consider the following:

Characteristics of the contents: Select appropriate liner material based on the acidity, alkalinity, or carbonation of the liquid.
Regulatory certifications: For pharmaceutical use, ensure compliance with regional regulations (e.g., FDA 21 CFR, EU 2031/2006).
Supply chain compatibility: Ensure the cap is compatible with filling equipment to avoid production line adjustment costs.

The 28x18mm aluminum ROPP cap, with its mature technology, reliability, and high customizability, has become the preferred solution for high-end liquid packaging globally, particularly for businesses that prioritize quality assurance and brand differentiation.

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