28x15mm Aluminum ROPP Cap

Product Overview

The ROPP (Roll-On Pilfer-Proof) aluminum screw cap is a widely used sealing solution in the beverage industry, particularly for wine, spirits, and some non-alcoholic drinks. It provides secure, tamper-evident sealing, ensuring product safety and integrity from bottling to consumption.

The transition from traditional corks to lightweight, easy-to-open caps began in the mid-20th century. By 1987, the 28x15mm aluminum closure-28mm outer diameter and approximately 15mm inner height-had become a standard due to its ideal balance of sealing performance, cost efficiency, and production compatibility.

Today, the 28x15mm aluminum ROPP cap is widely adopted in pharmaceuticals, beverages, liquors, and cosmetics as a standardized closure solution. Made from high-purity aluminum alloys (typically 8011 or 3003), these caps are precision-stamped for strength and lightweight characteristics and comply with ISO9001 and FDA food-contact safety standards.

Surface options include matte, brushed, glossy, or anodized finishes, with customizable logos, anti-counterfeit markings, and QR codes to meet premium packaging needs. HAOMEI Aluminum offers standard aluminum closures in 20mm, 22mm, 25mm, 28mm, 30mm, and 31.5mm sizes.

Product Specifications

5 Key Advantages of ROPP Aluminum Caps

1. Tamper Protection
Unique roll-thread design leaves visible break marks when opened, preventing resealing and deterring counterfeiting.

2. Excellent Airtightness
Equipped with PVC/PE liners, providing oxygen transmission rates <0.5cc/pkg/day (23°C, 50% RH) for superior preservation.

3. Wide Compatibility
Fits HDPE, PET, and glass bottles; tested to withstand thermal cycling from -40°C to 121°C.

4. High Productivity
Compatible with high-speed bottling lines (800–1200 caps/minute) for efficient large-scale production.

5. Eco-Certified
Made from 100% recyclable aluminum, passing SGS heavy metal migration tests (Pb/Cd < 0.01ppm).

Liner Options

Depending on your product and sealing requirements, the 28x15mm aluminum ROPP cap can be fitted with the following liners:

• EPE (Expanded Polyethylene) Liner
  General-purpose liner offering good sealing and cushioning; widely used in food, beverage, and personal care products.

• Saranex Multi-Layer Composite Liner
  Excellent oxygen barrier; ideal for wines and pharmaceuticals to extend shelf life.

• TPE (Thermoplastic Elastomer) Liner
  Chemically resistant and soft; suitable for medical liquids, lab reagents, and specialty chemical products.

• Unlined (optional)
  Available for customers who will add liners post-filling or require specific liner materials.

Custom liner materials, thicknesses, and colors are available upon request, with sample testing provided.

Applications of 28x15mm Cap Size

• Pharmaceutical Packaging:
  Cough syrups, eye drops, nutritional supplements, etc.

• Alcohol Packaging:
  20ml–100ml mini bottles of liquor, liqueurs, or aperitifs.

• Fragrance & Perfume Bottles

• Chemical Reagents & Laboratory Use

• Functional/Energy Drink Mini Packs

FAQ

Q1: Which bottle types are compatible with the 28x15mm aluminum ROPP cap?
A1: It fits bottles with a 28mm neck, including glass, PET, or aluminum bottles. It is commonly used for small-volume packaging such as pharmaceutical vials, test tubes, mini liquor bottles, and fragrance bottles. We recommend providing a bottle sample or neck drawing for precise fit testing.

Q2: Can I customize the logo or color of the cap?
A2: Yes. We offer various printing options including screen printing, offset printing, pad printing, hot stamping, and UV printing. Custom colors are available using Pantone codes to support your brand identity.

Q3: Are samples available? Is there a fee?
A3: We provide free samples of standard designs for testing (custom samples may incur a small charge). Shipping fees are not included. Please contact our sales team for special requirements.

Q4: What is the lead time?
A4: Standard designs are shipped within 3-5 business days. Custom orders typically require 7-15 business days, depending on quantity and complexity. Rush orders can be prioritized upon request.