8021 aluminum coil is a non-heat-treatable aluminum alloy belonging to the 8xxx series, alloyed mainly with iron (Fe) and silicon (Si). It is well known for its excellent barrier properties, good strength, and superior formability. Due to its clean surface quality and stable performance, 8021 aluminum coil is widely used in pharmaceutical packaging, food packaging, battery packaging, and laminated foil applications.
Description
Yutwin New Materials specializes in the production of aluminum coils and sheets in a wide range of alloys, grades, and specifications, offering stable quality, flexible customization, and reliable supply to meet the diverse needs of different industries.
Features
- High barrier performance
Effectively blocks moisture, oxygen, light, and odors, ensuring long-term protection for sensitive products.
- Excellent formability
Suitable for rolling, slitting, stamping, and deep drawing, enabling stable performance in high-speed production lines.
- Good mechanical strength
Provides higher strength than pure aluminum while maintaining good flexibility and processing stability.
- Superior corrosion resistance
Resists oxidation and corrosion, ensuring long service life in various environmental conditions.
- Clean surface quality
Low pinhole rate and uniform surface finish, ideal for pharmaceutical and high-end packaging applications.
- Food-grade safety
Non-toxic and odorless, compliant with food-contact and pharmaceutical packaging standards.
Specifications
| Item | Specification |
|---|---|
| Alloy | 8021 |
| Chemical Composition (%) | Al: Balance; Fe: 1.2–1.8; Si: ≤ 0.20; Cu: ≤ 0.05; Mn: ≤ 0.10; Mg: ≤ 0.05; Zn: ≤ 0.10; Ti: ≤ 0.05; Others: ≤ 0.15 |
| Temper | O, H14, H16, H18, H22, H24 |
| Thickness | 0.02 – 2.5 mm |
| Width | 100 – 2000 mm |
| Inner Diameter | 76 mm / 152 mm / 300 mm |
| Coil Weight | 1 – 5 tons (customizable) |
| Surface Finish | Mill finish, one side bright, both sides bright |
| Standards | ASTM, EN, GB/T, JIS |
Common Aluminum Surface Treatments
Polishing
Polishing uses mechanical grinding, chemical, or electrochemical methods to improve the smoothness and brightness of aluminum surfaces. Polished aluminum features a high-gloss finish and excellent decorative appearance.
Brushing
Brushing is a surface treatment process that creates fine, directional textures on aluminum using abrasive belts or brushes. The brushed surface provides a refined metallic appearance while helping conceal minor scratches.
Coating
Coating applies a protective coating onto the aluminum surface through powder coating, liquid spraying, or other coating methods. It provides excellent weather resistance, corrosion protection, and a wide range of color options. Coated aluminum offers both decorative appeal and long-term durabilit.
Anodizing
Anodizing is an electrochemical process that forms a dense oxide layer on the aluminum surface, improving corrosion resistance, wear resistance, and surface hardness. The oxide layer can also be colored to achieve various finishes.
Sand Blasting
Sand blasting uses high-speed abrasive particles to impact the aluminum surface, creating a uniform matte texture. This process provides a soft metallic appearance, reduces fingerprint marks, and improves coating adhesion for subsequent finishing processes.
Embossing
Embossing is a process that forms raised or recessed patterns on aluminum surfaces through rolling or stamping. Common patterns include stucco, diamond, and wood grain textures. Embossed aluminum offers excellent decorative effects, scratch resistance, and certain anti-slip properties.
Applications
- Food packaging
Widely used for aluminum foil in food wrapping, containers, trays, and pouches due to excellent corrosion resistance, hygiene, and barrier properties.
- Household applications
Suitable for kitchen foil, baking sheets, and disposable containers.
- Industrial packaging
Applied in pharmaceutical, cosmetic, and chemical packaging where hygiene, corrosion resistance, and barrier properties are important.
- Heat transfer applications
Ideal for components requiring good thermal conductivity, such as heat exchangers or thermal packaging.
- Electrical applications
Can be used for capacitors, shielding, and other thin-gauge electrical components.
- Decorative and functional laminates
Suitable for coating, printing, or laminating for functional or decorative purposes.
