In the food, beverage, and pharmaceutical industries, aluminum closures do more than seal a product. They protect quality, ensure safety, and add visual appeal. Therefore, choosing the right raw material becomes a crucial step that influences both efficiency and brand reputation.
Aluminum Standards for Bottle Caps
Flexibility for Forming
The material must handle deep drawing, bending, and stamping without cracking. In addition, good elongation helps reduce “earring” defects and keeps production smooth. As a result, manufacturers can meet technical standards while maintaining high output.
Strength to Secure the Closure
Bottle caps need enough strength to resist torque during sealing and shocks during transport. For example, alloys with tensile strength between 150–200 MPa can keep their shape without bending. Moreover, the balance between strength and ductility ensures reliable performance in daily use.
Precision and Clean Surface
Consistent thickness is critical, with tolerances as tight as ±0.005–0.01 mm. Furthermore, the surface should be smooth, free from scratches, and without oil marks. This not only improves the appearance of the cap but also allows for sharp printing, coating, and protective finishing.
Resistance to Corrosion
Closures are exposed to moisture and mildly acidic drinks. As a result, aluminum must resist oxidation, stay bright, and remain safe for food contact. In addition, strong corrosion resistance ensures compliance with food safety standards.
Consistency for Mass Production
Factories require materials that perform the same across every batch. On the other hand, unstable materials can increase defects and slow down production. Therefore, reliable alloys with uniform thickness, chemistry, and mechanical behavior are essential for mass production.
Why Alloys 3104 & 3105 Are the Ideal Solution
Based on these needs, alloys 3104 and 3105 are widely recognized as the best choice for bottle cap production.
- Their moderate elongation supports smooth forming with fewer cracks and defects. t reduces waste and improves efficiency.
- Tensile strength of 150–200 MPa provides enough hardness to keep caps secure without deformation. As a result, bottles remain sealed during storage and transport.
- Thickness control within ±0.005–0.01 mm and bright surfaces make them perfect for printing and coating. Moreover, the clean finish enhances product branding.
- With Mn and Mg content, both alloys resist oxidation and maintain shine. They stay durable even with carbonated drinks or humid environments.
- Manufacturers value their batch-to-batch consistency. As a result, production lines stay efficient, and the scrap rate remains low.
Partner with Us for Reliable Closure Materials
At MinhDung Holdings, we specialize in supplying 3104 and 3105 aluminum alloys designed for bottle caps. In addition, our service and support make us a trusted partner for manufacturers worldwide.
- Consistent quality: Guaranteed standards for thickness, strength, and surface finish.
- Secure supply: Steady stock available to meet large orders quickly.
- Flexible options: Coils, sheets, and ingots suited for different production lines.
- Technical support: Free samples, alloy selection advice, and cost optimization consulting.
👉 Looking for premium aluminum for closure production? Contact us today for a fast quote and free testing samples.
💌 Email: kinhdoanh@nhomminhdung.vn
☎️ Hotline/: (84)37.348.6719
