What Is a Non-Refillable Aluminum-Plastic Cap?
“Non-refillable” refers to a cap design that prevents liquid from being refilled through the bottle opening once sealed. This eliminates the risk of counterfeiting, reuse, or illegal refilling—crucial for high-value liquids such as olive oil.
Specifically, the 31.5mm aluminum-plastic cap features a standard screw-thread design with a built-in non-refillable mechanism (e.g., backflow-prevention liner or anti-drip insert). It is composed of aluminum and PE/PP plastic, ensuring both a secure seal and effective anti-counterfeiting protection.
Precision Fit, Perfect Compatibility
31.5mm is not just a random size—it’s an industry-standard diameter that ensures tight, secure sealing with most olive oil glass or PET bottles. This standardized fit guarantees consistent performance and leak-proof reliability.
Aluminum-Plastic: A Superior Barrier
Aluminum Layer: Acts as a robust shield, delivering nearly perfect barrier properties. It effectively blocks oxygen to prevent oxidation and rancidity, reflects harmful UV rays to reduce photodegradation, and protects against moisture and external odors.
Plastic Layer: Provides flexibility, easy-open functionality, and strong sealing interaction with the bottle mouth.
Key Advantages of 31.5mm Non-Refillable Aluminum-Plastic Cap:
Freshness Seal: Elastic liners and sealing gaskets tightly fit the bottle mouth, minimizing air exchange.
Anti-Oxidation Protection: The aluminum barrier blocks oxygen, preserving olive oil’s taste and nutritional value.
Light Shielding: Aluminum reflects light; the colored plastic absorbs it, protecting oil from light-induced degradation.
Tamper-Evident Safety: The non-refillable structure and tamper ring provide visible evidence of first opening, helping consumers identify unauthorized access and ensuring product safety.
Technical Specifications
| Size | 31.5 x 24mm |
| Weight | 5g |
| Material | Aluminum + Plastic |
| Type | Screw cap |
| Feature | Non-refillable |
| Liner Options | PE, TPE |
| Decoration | Offset printing / Embossing / UV printing / Hot stamping / Screen printing |
| Colors | Green, black, customizable |
| Logo | Custom logo available |
| OEM/ODM | Accepted |
| Packaging | Carton & pallet / Carton only (customizable) |
| Origin | Zhengzhou, Henan, China |
| Payment Terms | T/T, L/C, etc. |
| MOQ | 50,000 pieces |
Why Choose Us?
Decades of industry experience
Certified quality systems (ISO9001, QS, etc.)
Fast customization & sampling
Competitive pricing with stable bulk supply
Responsive support & worry-free after-sales service
HAOMEI Aluminum is a professional manufacturer of anti-counterfeit aluminum caps, aluminum-plastic composite caps, and plastic closures. All products comply with China’s food safety standards. We offer free samples, flexible prototyping, and mass production capacity, with exports to Europe, Asia, South America, and beyond.
