In high-end cosmetic packaging, the bottle cap is not only a functional component but also a key medium for brand image communication. Especially for products such as perfumes, serums, and lipsticks, the texture and durability of the cap directly influence consumer purchasing decisions.

Chromium plating and DOS treatment are two common aluminum sheet surface processing techniques widely used in manufacturing premium cosmetic bottle caps.

Chromium Plating

Process: Electroplating a chromium layer on the surface of aluminum sheets (such as 1070 or 1060 alloys) to achieve a mirror-like or matte metallic finish, often combined with secondary processing such as spraying or hot stamping to enhance aesthetics.

Features:

• Decorative appeal: High gloss and luxurious metallic look, ideal for premium perfume caps and serum lids (e.g., gold or silver chrome finish).

• Protection: The chromium layer offers basic corrosion resistance; however, prolonged contact with alcohol-based cosmetics may cause fading (alcohol resistance tests recommended).

DOS Treatment

Process: Specifically optimized for deep-drawing applications, aluminum sheets (such as 1070-H24 or 8011-O temper) are processed through controlled grain size, surface oil coating, and annealing to improve drawability, oxidation resistance, and surface quality.

Features:

• Manufacturing advantages: Low earing rate, high elongation (1070 aluminum elongation ≥30%), suitable for complex bottle cap structures (e.g., lipstick tubes, vacuum pump caps).

• Surface compatibility: Clean, oil-free base material with minimal pinholes; supports direct anodizing and coloring for matte or glossy finishes.

• Eco-friendly: No electroplated layer, compliant with food contact standards (e.g., 8011 aluminum foil for sealing liners).

Product Specifications

Why Choose Chromium-Plated and DOS-Treated Aluminum for Cosmetic Bottle Caps?

• Outstanding appearance and texture: Chromium-plated aluminum delivers a mirror-like metallic luster that instantly elevates the product’s image-perfect for making perfume and serum caps stand out on retail shelves.

• Corrosion resistance: Both chromium plating and DOS treatment create a dense, hard protective layer on the aluminum surface, effectively resisting wear, oxidation, and corrosion to keep caps looking brand new for longer.

• Scratch resistance: Treated aluminum achieves higher hardness, preventing caps from being easily scratched during transport or daily use, thus maintaining product integrity and aesthetics.

• Excellent formability: The DOS coating acts as a lubricant during stamping and deep drawing, preventing cracking or surface damage-ideal for manufacturing complex, detail-rich cap designs.

• Higher production yield and lower costs: DOS coating reduces friction between molds and sheets, and when combined with chromium plating, significantly lowers defect rates in cap manufacturing, boosting production efficiency.

• Eco-friendly and recyclable: Aluminum is 100% recyclable, supporting sustainable manufacturing and environmental responsibility.