28mm Aluminium Screw Cap
The 28mm aluminium screw cap is designed to fit bottles with a neck diameter of 28mm, commonly used for packaging beverages, essential oils, food colorants, and other liquids.
The 28mm Aluminium Screw Cap is made of high-quality aluminium, combining a lightweight structure with corrosion resistance and durability. The natural oxidation resistance of aluminium makes it an ideal choice for exposure to moisture, chemicals, or outdoor environments. It is non-magnetic, has good thermal conductivity, and can undergo anodizing to enhance surface hardness or for custom color finishes.
HC Bottle Cap Manufacturing Co., Ltd. has over 17 years of experience providing various aluminium caps, plastic caps, aluminium-plastic caps, glass bottles, and other packaging products. Our products are sold to more than 20 countries worldwide, including the United States, Europe, South Africa, Southeast Asia, and more.
HC Aluminum 28mm Aluminium Screw Cap Specifications
| Specification Item | Description |
| Diameter | 28mm outer diameter (OD), designed to match the corresponding threaded opening. |
| Height | Typically proportional to the diameter (e.g., 10-15mm), but can be customized according to the application. |
| Thread Specifications | Metric or imperial thread options (e.g., M28x1.5 standard pitch). |
| Liner Type | EPE (Expanded Polyethylene) Liner / PE / Polyester (PET) Liner / Foam Liner / Foil Liner / PVC (Polyvinyl Chloride) Liner |
| Surface Finish Options |
- Anodized: Available in a variety of colors (silver, gold, black, red, blue) for corrosion resistance and aesthetics. - Powder Coating: Enhances durability and custom color matching. - Polished/Brushed: Decorative surface treatment, suitable for visible applications. |
| Temperature Range | Stable from -50°C to 200°C depending on the sealing material. |
| Chemical Resistance | Compatible with oils, solvents, and weak acids (avoid strong alkaline solutions). |
| Standards | Conforms to ISO, DIN, or ASTM standards (as required). |
| Customization Options |
- Branding Options: Laser engraving, embossing. - Thread Adjustment: Pitch, diameter to match existing systems. |
The company relies on a strictly controlled production process to produce high-quality bottle caps. HC Bottle Cap Manufacturing Co., Ltd. ensures that each cap meets international standards in appearance, performance, and quality, fulfilling various customer needs and providing superior packaging solutions.
28mm Aluminium Screw Cap Design Features
- Material: These caps are made from durable aluminium with a smooth metal finish, enhancing the product's aesthetics.
- Liner: The caps are equipped with EPE (Expanded Polyethylene) liners, ensuring a tight seal, maintaining product freshness, and preventing leaks.
- Design: The ribbed exterior provides a non-slip grip, making it easier to use and remove.
- Enhanced Grip: Knurled edge or smooth finish options for manual tightening or tool use (e.g., wrench flat).
- Compatibility: Suitable for bottles with a 28mm neck diameter, including various glass and plastic containers.
- Sealing Mechanism: Optional integrated O-ring groove or compression gasket (EPDM, silicone) for airtight/waterproof seals.
- Structure: Machined or die-cast with high precision; internal threads ensure secure fastening.
28mm Aluminium Screw Cap Applications
| Application | Description |
| Beverage Bottles | The 28mm aluminum screw cap is widely used to seal various beverage bottles, especially suitable for products like juice, soft drinks, etc. Its excellent sealing performance effectively prevents gas leakage and oxidation of the beverage, ensuring the product remains fresh and its taste unchanged. Its durability and corrosion resistance make it an ideal choice for long-term storage of beverages. |
| Water Bottles | The 28mm aluminum screw cap is commonly used for sealing water bottles, providing excellent sealing performance to prevent leakage and contamination. The cap has good pressure resistance and corrosion resistance, ensuring the purity of the water inside, especially suitable for bottled water products such as sports drinks and mineral water. |
| Essential Oils | The 28mm aluminum screw cap is an ideal choice for essential oil bottle packaging due to its good sealing effect and ability to prevent evaporation. The cap effectively prevents the essential oils from being affected by air, moisture, and sunlight, preserving the quality and fragrance. It is also suitable for small bottles of high-end essential oils and perfumes. |
| Food Coloring | The 28mm aluminum screw cap is used in food coloring bottles to ensure the stability and safety of the coloring agents. By providing a sealed protection, it prevents the coloring from being affected by moisture, contamination, or leakage, ensuring that the color and quality of the product are maintained for a long time. The cap can also withstand frequent opening and closing, making it suitable for food production and daily use. |
| Cosmetics Formulas | The 28mm aluminum screw cap is suitable for various cosmetic bottles, such as creams, lotions, and serums. Its sealing performance helps maintain the freshness and stability of the products, preventing air and bacterial contamination. Additionally, the elegant appearance of the aluminum screw cap enhances the packaging of high-end cosmetic products. |
| Pharmaceutical Liquids | The 28mm aluminum screw cap is an ideal choice for pharmaceutical liquid packaging, especially for medicinal syrups, medicinal solutions, or oral liquids. It provides efficient sealing protection, preventing air, moisture, or contaminants from entering the bottle, ensuring long-term stability and effectiveness of the medication. Moreover, the aluminum cap also meets hygiene and tamper-evident requirements, enhancing product safety. |
How to Choose 28mm Aluminum Screw Cap Lining?
When selecting the appropriate lining for the 28mm aluminum screw cap, the choice largely depends on the specific product being packaged and the necessary sealing, protection, and preservation characteristics.
General guidelines for choosing a liner:
- Cost-effective solution: If budget is a concern, EPE liners offer a good balance of sealing and protection for most products.
- Tamper-evident and high-barrier performance: For products requiring secure sealing and protection, especially those sensitive to environmental factors, foil or induction-seal liners are the best choice.
- Chemical resistance and durability: For products like oils or chemicals, PET or PVC liners provide the necessary durability and barrier properties.
- Cushioning and protection during transport: When additional cushioning is needed to protect fragile items, foam liners are an ideal choice.
By understanding the needs of the product being packaged (such as sensitivity to moisture, air, or temperature), you can choose the most suitable liner to ensure optimal protection and product lifespan.
| Application Area | Recommended Liner Type | Liner Features | Suitable Products |
| Food and Beverage | EPE (Expanded Polyethylene) Liner, PVC Liner | - Lightweight and cost-effective - Provides good sealing performance - Prevents leakage and keeps products fresh | - Juices - Sauces - Edible oils - Seasonings |
| Cosmetics | EPE (Expanded Polyethylene) Liner, Foam Liner | - Non-toxic, chemically resistant - Provides sealing performance to maintain product freshness - Foam liners offer additional protection | - Perfume - Creams - Shampoos - Essential oils |
| Pharmaceuticals | PVC Liner, Aluminum Foil Liner | - Provides strong sealing - PVC liners offer good moisture resistance - Aluminum foil liners provide tamper-evident function | - Medicinal syrups - Herbal liquids - Medical liquids |
| Essential Oils or Sensitive Liquids | Aluminum Foil Liner, Induction Seal Liner | - Provides high protection, preventing oxygen and moisture infiltration - Induction seals ensure tamper-evident closure - Aluminum foil liner prevents oxidation | - Essential oils - Perfume - High-end liquids |
| Oils, Chemicals, and High-performance Liquids | PET (Polyester) Liner, Aluminum Foil Liner | - Provides good sealing - Strong chemical resistance and corrosion protection - Aluminum foil liners provide additional protection | - Industrial oils - Automotive fluids - Chemicals |
| Moisture-sensitive Products | PVC Liner, Aluminum Foil Liner | - Provides strong moisture protection - PVC liners effectively block oxygen - Aluminum foil liners provide moisture and oxidation resistance | - Pharmaceuticals - High-end food products (such as vitamins, supplements) |
- EPE liner is suitable for general food, beverages, and cosmetics, offering good sealing performance and cost-effectiveness.
- PVC liner provides higher moisture protection, suitable for products that need to be protected from oxidation and moisture, such as pharmaceuticals and certain foods.
- Aluminum foil liners and induction seal liners provide high protection and tamper-evident functionality, ideal for sensitive liquids and premium products.
- PET liners are suitable for oils, chemicals, and products requiring higher chemical resistance and sealing performance.
When choosing a 28mm aluminum screw cap, ensure compatibility with your specific bottle type and neck finish. It is recommended to conduct product testing to confirm whether the cap fits your application.
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