20-410 Silver Aluminum Bottle Cap

The 20-410 standard continuous thread aluminum cap is one of our mature and reliable core products. It is manufactured using high-quality aluminum material and advanced processing techniques, strictly adhering to the internationally accepted 20mm C-410 neck finish standard.

Bottle neck specification 20-410: Standard Continuous Thread (Diameter 20 mm, Thread Pitch 410)

The 20-410 silver aluminum bottle cap is a premium continuous thread closure, precisely designed for sealing 20/410 neck containers. It balances functionality and aesthetics with a brushed silver aluminum shell and integrated PE foam liner, providing an airtight seal. Primary application areas include cosmetics, pharmaceuticals, health and beauty products, and specialty chemicals, where leak-proof integrity and high-end appearance are critical.

"20": Indicates that this aluminum cap is designed for use with bottle necks that have an outer diameter of 20 mm. This is the key dimensional reference of the cap, determining the inner diameter and thread start position.
"410": Indicates that the cap uses the 410 specification thread from the C-Line (Continuous Thread) standard. This means:
Thread Type: Standard Continuous Thread. This is a widely used thread design for bottle necks in packaging for beverages, water, pharmaceuticals, etc., providing reliable tightening and opening functionality.

Thread Parameters: "410" specifically refers to the thread pitch and profile conforming to the industry-defined C-410 standard. This means:

The thread is continuous and evenly spaced.

There are approximately 410 threads per inch of length (converted to a pitch of about 0.062 mm, although this is more of a specification code, and actual production is based on standard molds).

The thread depth, angle (typically 15° or 30°), and shape strictly comply with the C-410 specification to ensure perfect engagement and sealing with standard 20 mm neck finishes.

20-410 Silver Aluminum Bottle Cap

20-410 Aluminum Cap Material and Surface Treatment

Bottle Body: Pure aluminum – a corrosion-resistant, rust-proof, and fully recyclable metal.
Color/Finish: Bright silver or brushed silver for a premium and minimalist appearance.
Liner: PE/LDPE foam for effective sealing – moisture-proof, leak-proof, and preservative.

20-410 Aluminum Cap Material Composition Table

Component Part	Material Category	Common Grade/Composition	Performance Characteristics Description
Main Cap Body	High-Quality Aluminum-Magnesium Alloy Coil	AA 8011-H24, AA 3003-H24	Excellent formability: suitable for deep drawing, thread forming, and tamper-evident ring structure forming
			High strength: withstands tightening torque and internal pressure
			Good ductility: clean break of tamper-evident bridges
			Lightweight: reduces transportation weight and carbon emissions
			Strong barrier properties: oxygen resistance, moisture resistance, and light shielding
			Excellent recyclability: 100% recyclable material
Sealing Gasket	Food-grade polymer material	See detailed classification below	Embedded or laminated inside the cap body to enhance sealing, leak resistance, and preservation performance

20-410 Aluminum Cap Sealing Gasket Material Classification

Gasket Type	Common Materials	Application Scenarios and Features
PVC Sol Gasket	Polyvinyl Chloride (PVC)	Low cost, strong adaptability
		Good conformity to bottle neck curvature
		Suitable for water, juice, edible oil and other liquids
Injection/Drip Molded Gasket	PE, PP, TPE	Injection molded, strong sealing performance
		Resistant to internal pressure, suitable for carbonated drinks
		Resistant to flavor migration, suitable for sensitive products
Foamed PE Gasket	Expanded Polyethylene (EPE)	Good elasticity, strong compensation ability
		Suitable for bottle necks requiring tolerance compensation
		Commonly used for dry goods, pharmaceuticals, health products, etc.

20-410 Aluminum Cap Surface Treatment Types and Functional Table

Treatment Method	Process Description	Functions and Features
Anodizing	Forms a dense oxide film on the aluminum surface through electrochemical oxidation	Enhances corrosion resistance
		Can be colored (silver, gold, black, etc.)
		High-end surface texture
Spray Coating (UV)	Surface coated with UV-curable paint	Provides matte or glossy effects
		Enhances visual appeal and tactile feel
		Scratch-resistant and anti-oxidation
Screen Printing	Uses a screen to print patterns/logos on the aluminum cap surface	Customizable brand logos/text
		Bright colors, good durability
Heat Transfer / Hot Stamping	Transfers film/metal foil to the aluminum cap surface using high temperature	Premium texture (metallic luster)
		Commonly used for perfume and beauty product caps
Laser Engraving	Precision laser ablation to engrave logos/serial numbers	Anti-counterfeit and traceable
		Difficult to wear off or tamper with

20-410 Aluminum Cap Bottle Neck Compatibility and Testing Parameters

Test Item	Standard or Requirement	Test Description
Torque Test	Typical opening torque around 0.8–1.2 N·m (varies by product)	Ensures easy opening but prevents accidental opening
Torque Test		Excessive torque may damage the bottle neck, too low may cause leakage
Sealing Test	Vacuum/liquid leakage test, inverted for 72 hours with no leakage	Uses positive/negative pressure machines to simulate transport and pressure conditions
Sealing Test		Especially critical for liquid products
Internal Pressure Resistance Test	For carbonated beverage caps, pressure resistance ≥0.6 MPa (depending on design)	Verifies gas pressure does not cause gasket failure or cap deformation
Compatibility Test	No burrs/slipping with 20-410 PET or glass bottles	Variations in bottle neck tolerance among suppliers; compatibility testing recommended
Aging and Transport Simulation Test	High temperature and humidity storage, freeze-thaw cycles, vibration and impact tests	Ensures no deformation, leakage, or discoloration during long-term storage/transport

20-410 Aluminum Cap Structure

Shell: Made of corrosion-resistant aluminum — lightweight, durable, and fully recyclable; rust-free.
Surface Treatment: Brushed or smooth silver metal for a high-end visual effect. Available in matte, gloss, or embossed textures.
Liner: Usually PE foam (LDPE or F-217 low-density polyethylene). This compressible liner forms a leak-proof seal at the bottle neck.

20-410 Aluminum Cap Structural Components and Functional Description Table

Structural Part	Description	Function and Role
Top Plate	The flat top surface of the cap, can be color printed, hot-stamped with gold/silver, or retain original anodized aluminum finish.	Main structural support component
		Provides space for brand display
		Applies vertical pressure to the bottle neck for sealing
Sidewall / Skirt	Circular structure vertically extended from the top plate, typically 10–15 mm in height, houses the internal thread.	Engages with bottle neck to maintain cap positioning
		Supports the tamper-evident ring structure
		Provides tactile feel for manual opening
Thread	Helical internal thread, compliant with C-410 standard (20 mm diameter × 410 pitch).	Enables precise engagement
		Compatible with automatic capping machines
		Provides reliable sealing
		Supports multiple opening/closing cycles
Tamper-Evident Ring	Ring structure at the bottom of the skirt, connected by multiple small “bridge points”. These break on first opening, causing the ring to detach.	Provides visible indication of first opening
		Prevents unauthorized opening or refilling
		Enhances product safety and consumer confidence
Inner Sealing Surface	Flat area on the inside of the top plate where the gasket adheres, typically smooth finished.	Allows uniform pressure on the gasket for tight bottle neck sealing
		Prevents localized leakage or seal failure

Additional Explanation of Thread Structure (410 Standard)

Key Features	Description
Pitch	Single-turn continuous thread with approximately 400 threads per inch
Compatible Bottle Neck	Fits standard PET or glass bottle necks with 20mm outer diameter and 410 thread specification
Engagement Characteristics	Moderate torque suitable for automatic capping machines and manual consumer operation
Interchangeability and Compatibility	Complies with standards platforms such as CPI (Closure & Packaging International)

20-410 Aluminum Cap Functional Advantages

Excellent sealing: Precisely matched C-410 thread, flat inner sealing surface, high-quality gasket, and accurate torque control together ensure reliable sealing for liquids (water, beverages, oils), gases (carbonation), and solids.
Reliable tamper-evidence: The tamper-evident ring design clearly indicates first opening, enhancing product safety and consumer trust.
Good mechanical properties: Sufficient strength and rigidity to withstand capping machine torque, stacking pressure, and transportation vibration.
Superior ease of opening: The C-410 continuous thread design provides moderate opening torque for a pleasant consumer experience.
Wide compatibility: Meets the internationally accepted 20-410 bottle neck standard, seamlessly fitting standard 20mm C-410 bottle necks on the market.
High production efficiency: Suitable for high-speed automated production lines (cap manufacturing and filling capping lines).
Attractive and customizable: The top surface can be diversified with printing and decoration to enhance brand image.
Safe and environmentally friendly: Food-grade materials compliant with relevant regulations (such as FDA, EU) and 100% recyclable.

20-410 Aluminum Cap Applications

Bottled water: Various specifications of purified and mineral water.
Carbonated soft drinks: Small bottles of cola, Sprite, etc. (must withstand internal pressure).
Juice and functional beverages: Small volume packaging.
Edible oils and condiments: Small bottles of cooking oil, soy sauce, vinegar, etc.
Pharmaceuticals and health products: Oral liquids, syrups, medicinal bottles (must meet stricter safety and regulatory requirements).
Personal care products: Small volume trial packs of shampoo, shower gel, etc.
Other liquid packaging: Such as small packages of industrial chemicals (material compatibility must be confirmed).

HC Aluminum 20-410 Aluminum Cap Quality Control

Dimensional accuracy: Strict control of critical dimensions such as inner diameter, thread size (pitch, lead, depth), total height, and tamper-evident ring position to ensure perfect fit with bottle necks and smooth machine compatibility. Inspections use precision measuring tools (e.g., projectors, thread gauges).
Sealing performance testing: Simulates real conditions using negative/positive pressure sealing testers to ensure the cap meets customer sealing level requirements (e.g., no water or air leakage).
Opening torque testing: Measures the torque required to unscrew the cap, ensuring it is within a reasonable range (neither too tight nor too loose).
Tamper-evident ring performance: Tests the force required to break the tamper-evident ring and evaluates the condition after breakage (whether it detaches cleanly without burrs), ensuring effective first-opening indication.
Coating adhesion and corrosion resistance: Tests the resistance of internal coatings to external corrosive media (such as salt spray) and content, as well as the abrasion resistance of printed coatings.
Gasket integrity: Checks whether the gasket is correctly positioned, free of defects, and firmly bonded to the cap body.
Appearance quality: Inspects print clarity, color consistency, surface finish, and absence of visible scratches, dents, or oil stains.

The 20-410 standard continuous thread aluminum cap is one of our mature and reliable flagship products. It is manufactured with high-quality aluminum and advanced processes, strictly following the internationally accepted 20mm C-410 bottle neck standard. This cap is favored by many beverage, food, daily chemical, and pharmaceutical manufacturers due to its outstanding sealing performance (especially suitable for water and carbonated drinks), reliable tamper-evident function, smooth opening experience, exquisite printable surface, and efficient production adaptability.

Important note: To ensure optimal performance and sealing, customers must ensure that the glass or plastic bottles they use fully comply with the 20mm C-410 (DCRI) standard when selecting 20-410 aluminum caps. We offer bottle neck compatibility testing services.

The 20-410 silver aluminum cap is designed for performance, compliance, and shelf appeal. It combines the robust seal of a PE foam liner with the stylish design of aluminum, ensuring product integrity across industries. Its low-volume packaging and sustainable materials make it an ideal choice for brands seeking both functionality and quality.

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