33-410 Aluminum Cap

The 33-410 aluminum cap refers to a screw cap designed for bottles with a 33mm neck diameter and a 410 thread pattern. It is typically made of aluminum and used for packaging food, cosmetics, lotions, beverages, and similar applications.

The 33-410 Aluminum Cap typically includes a liner made of PE foam or EPE, which provides compressible sealing and chemical resistance for water-based or acidic products.

Material: Made from 8011-H16 aluminum alloy strip, typically with a thickness of 0.2±0.01mm, offering both corrosion resistance and mechanical strength.
Inner Diameter: 32.6±0.1mm.
Sealing Performance: Passes negative pressure test (maintains -60kPa vacuum for 30 minutes without leakage), ensuring contents remain uncontaminated during storage and transportation.

These caps can be smooth or ribbed, sometimes designed to be tamper-evident or compatible with inserts (such as pourers), and support various surface finishes or printing.

33-410 Aluminum Cap

33-410 Aluminum Cap Specifications

Attribute	Typical Specification
Size / Finish	33-410 (thread size = 33 mm outer, 410 pattern)
Material	Aluminum
Height	~10 mm
Liner types	PE foam, EPE, plastisol, HS, dual liners
Sealing	Water-based acids, cosmetics; not ideal for oily solvents
Decoration	Printing, embossing, anodized finishes
Order Qty	Often bulk minimums (5K–50K pieces), some accept smaller orders
Thread Standard	Matches standard 33mm container neck finish

33-410 Aluminum Cap Product Features

Sealing Performance

Precision stamping process ensures perfect sealing
Optional liners (e.g., PE, PVC, or composite liners)
Passes airtightness tests with excellent leak-proof performance

Surface Finishing

Anodizing (optional colors: silver, gold, etc.)
Optional painting or printing processes
Anti-fingerprint treated surface

Structural Design

Tamper-evident design (optional)
Tamper-proof ring design (on some models)
Easy-open raised edge design

33-410 Aluminum Cap Color Options

Silver 33-410 Aluminum Cap
Gold 33-410 Aluminum Cap
Black 33-410 Aluminum Cap
White 33-410 Aluminum Cap
Red 33-410 Aluminum Cap
Blue 33-410 Aluminum Cap
Dark Green 33-410 Aluminum Cap
Yellow 33-410 Aluminum Cap

33-410 Aluminum Cap Applications

Cosmetic containers: lotions, facial sprays Small food items: sauces, oils, syrups Home and personal care products Beverage packaging (single-serve or small bottles)

These caps feature a sleek metallic appearance and provide excellent sealing for non-hydrocarbon and water-based substances.

33-410 Aluminum Cap Manufacturing Process and Quality Control

Manufacturing Process

Stamping: High-precision molds are used to stamp aluminum strips, forming the basic shape of the cap, followed by trimming, curling, and other processes to complete the basic structure.

Surface Treatment:

Cleaning: Ultrasonic cleaning with purified water to remove oil and aluminum scraps, partially done in Class C cleanrooms.
Coating: Anodizing or epoxy resin coating to enhance corrosion resistance and appearance, with coating adhesion tested via ethanol wipe test.
Printing: Laser marking or offset printing for logos, batch numbers, etc.; some products use QR code traceability technology.

Quality Standards

Mechanical Properties: Tensile strength 130-180N/mm², elongation ≥3.0%, puncture resistance ≤80N (medical use), opening torque meets industry standards.
Sterilization Compatibility: Can withstand 121°C moist heat sterilization or dry heat sterilization without deformation or coating peeling after sterilization.

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