In the cosmetic packaging industry, including luxury skincare products, tube creams, and makeup refill bottles, aluminum slugs is the core raw material for extruded metal containers. Cosmetic-grade aluminum slug undergoes high-purity smelting, homogenization, precision cutting, and surface purification processes, making it suitable for cold extrusion processing. It has become a preferred substrate for global cosmetic packaging manufacturers.
Material purity is the primary and crucial indicator for cosmetic aluminum slug. Aluminum slugs for cosmetic containers generally use 1070-O high-purity aluminum substrate, with an aluminum content ≥99.70%. Strict control is maintained over impurities such as iron, silicon, copper, lead, and cadmium. Iron content is controlled below 0.20%, silicon content less than 0.15%, and heavy metal residues meet EU safety standards for cosmetic contact materials. A low impurity ratio avoids defects such as black spots, pinholes, dark cracks, and uneven grains after extrusion, preventing the migration of harmful substances into cosmetic materials such as creams, essential oils, and lip glosses. This makes it suitable for high-standard packaging requirements in products like sensitive skincare and baby care cosmetics.
Excellent cold extrusion forming performance is the core competitive advantage of cosmetic aluminum slugs. The 1070 aluminum slugs undergoes homogenization annealing at 600℃, resulting in fine and uniform internal grains and a stable Vickers hardness controlled within the 28-35HV range, achieving a moderate level of softness and hardness. Excessive hardness can lead to significant wear on the extrusion die and tearing of the cylinder wall; conversely, excessively soft material can cause deformation of the formed aluminum container. Standardized aluminum slugs have a thickness tolerance controllable to ±0.03mm and a roundness error ≤0.02mm. The end faces are smooth and burr-free, and the material exhibits stable flowability during cold extrusion. This allows for the one-time molding of thin-walled components such as cosmetic tubes, portable aluminum cans, perfume boxes, and aluminum liners for eye creams. The finished product wall thickness can be as uniform as 0.12mm, significantly reducing subsequent trimming and defective product losses.
Secondly, the aluminum slugs offer ample room for surface modification, adapting to diverse aesthetic preferences in cosmetic packaging. After being extruded into containers, qualified aluminum slugs can undergo various surface treatments including anodizing, matte sandblasting, gloss polishing, color spraying, hot stamping, and embossed printing. The high-purity aluminum substrate exhibits strong color adhesion, reducing the likelihood of paint peeling or color patchiness. This allows for the creation of sophisticated matte silver, frosted gold, and Morandi color schemes—currently popular finishes for cosmetic containers—helping daily chemical brands establish distinctive packaging designs that evoke luxury, minimalism, or Instagram-worthy aesthetics.
From an environmental and commercial perspective, aluminum is a recyclable metal material that can be recycled indefinitely. The energy consumption for recycling is only about 5% of that for primary aluminum, aligning with the current trend of plastic reduction and recyclability in the beauty industry. Compared to plastic containers, aluminum cosmetic packaging blocks light and moisture, delaying the oxidation and deterioration of essential oils and active serums. Aluminum slugs manufacturers can customize diameter, thickness, and surface cleanliness levels according to customer orders, offering strong stability in bulk supply and advantages in delivery time, customization flexibility, and cost.
Aluminum slugs for cosmetic containers, with their stringent ingredient control, stable molding capabilities, abundant surface processing potential, and environmentally friendly properties, form the foundation of high-end aluminum cosmetic packaging. Future demand is expected to grow further with the market for portable, travel-sized skincare products.
