28mm Black Aluminum Screw Top Cap

This cap features a 28mm (nominal) continuous thread design (commonly referred to as "28-400"), with an outer diameter of approximately 1.194 inches (30.3 mm) and a height of approximately 0.407 inches (10.3 mm), making it compatible with standard glass and plastic bottles and jars used in food, cosmetics, chemicals, and industrial applications. The cap is made from thin-gauge aluminum or electrolytic tinplate (tin-coated steel), stamped into shape with ribbed sidewalls and a smooth top, then coated with black paint or lacquer to present an elegant matte or glossy finish.

‌Material‌: Made from aluminum material, offering excellent corrosion resistance and sealing performance
‌Color Process‌: Black appearance customization can be achieved through anodizing or spraying processes, meeting aesthetic needs for various packaging scenarios

The 28mm black aluminum screw cap is made from lightweight and durable aluminum, typically treated with anodizing or coating to enhance corrosion resistance and appearance. These caps are designed with a continuous thread (CT) or roll-on pilfer-proof (ROPP) mechanism to ensure a secure fit on bottles with a 28mm opening. The black surface is usually achieved through anodizing or other surface treatments, creating a stylish and professional look that meets diverse packaging demands.

28mm Black Aluminum Screw Top Cap Structural Design

‌Size Specification‌: Diameter is 28mm, with height adjusted according to bottle neck depth
‌Thread Design‌: Matches the standard 28-thread, with some products featuring built-in PE liners or plastic sealing layers to enhance leak resistance
‌Auxiliary Features‌: Some models incorporate aluminum-plastic composite structures (such as ROPP caps), with added tamper-evident functionality, suitable for premium liquor packaging

28mm Black Aluminum Screw Top Cap Main Specifications

Specification Item	Information
Dimensions	Inner Diameter: Approximately 27.8–28.2 mm
Dimensions	Height: Ranges from 12.7 mm (standard) to 20.6 mm (ROPP cap)
Thread Type	28-400 (compatible with glass and plastic bottles)
Liner Options	PE Foam: General-purpose sealing for syrups, sauces, cosmetics, and household chemicals; compressible and chemically resistant but lacks tamper-evident function.
	Plastisol: Ideal for hot-fill applications (e.g., sauces, beverages), forms airtight seals during filling.
	Silicone/Butyl Rubber: Offers higher compatibility with pharmaceuticals or oily liquids.
	Pressure-Sensitive or Induction Liners: Used for tamper-evident sealing in pharmaceuticals or food.
Material and Surface Treatment	Substrate: Electrolytic tinplate (basis weight 73–80 lbs) or pure aluminum, favored for its strength, formability, and corrosion resistance.
Material and Surface Treatment	Surface Coating: After forming, a black lacquer or powder coating is applied to achieve uniform color, UV resistance, and optional gloss level (matte to high gloss).

28mm Black Aluminum Screw Top Cap Threads and Sealing

Thread Type

Continuous Thread (CT), capable of 360° engagement, easy to tighten with reliable torque control.

Liner Options

PE (Polyethylene) Foam: Compressible universal sealing material suitable for acids, alkalis, solvents, water-based liquids, and cosmetics.
Pulp and Polyethylene: Rigid pulp bonded to PE film; excellent moisture resistance, extending shelf life of dry powders, honey, and non-acidic foods.
Plastisol (PVC) Liner: Full-disc liner providing airtight seal, heat-sealable, with a maximum temperature of approximately 74°C; suitable for canning, vacuum packaging, and hot-filling processes.
Aluminum Foil / Heat Seal / Pressure-Sensitive: Used for tamper-evidence and volatile substances; can be adhered to the cap or applied after filling.

28mm Black Aluminum Screw Top Cap Features

Tamper-Evident Design: ROPP caps leave a drop-down ring at the bottle neck after opening to ensure tamper evidence.
High Temperature Resistance: Aluminum can withstand various temperatures, suitable for hot filling or refrigeration.

28mm Black Aluminum Screw Top Cap Customization and Branding

Color and Texture

In addition to black, the cap can be powder-coated or anodized in virtually any Pantone color; matte, satin, or glossy textures available upon request.

Decoration

Silk screen printing, hot stamping, laser engraving, or custom shrink sleeves can be applied to the cap top or skirt to display branding and product information.

Tamper Evidence

Tear-off seals or induction seals can be integrated based on regulatory or market requirements (compatibility testing required).

28mm Black Aluminum Screw Top Cap Applications

Alcohol Packaging: Widely used for wine, whiskey, and other liquor bottles, supporting recyclable design.
Food and Beverage: Honey jars, condiment bottles, single-serve sauces, hot-filled beverages (with plastisol liners).
Cosmetics and Personal Care: Lotions, creams, serums, reed diffusers, essential oils — PE foam and plastisol liners ensure fragrance retention and prevent leakage.
Pharmaceuticals and Chemicals: Solvents, tinctures, laboratory reagents — for corrosive chemicals, phenolic polymer sealing options are also available.
Industrial and Sample Use: Sample bottles, promotional bottles, small-batch essential oils — lightweight aluminum helps reduce shipping costs while maintaining durability.

This 28mm black aluminum screw cap features a universal 28-400 finish, premium materials, versatile sealing liners, and rich customization options, making it an industry-standard closure suitable for a wide range of products.

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