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8021 aluminum foil

Last Updated: 2023-09-12

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8021 aluminum foil is a widely used material in daily life, and if you are involved in the manufacture, supply, or wholesale of aluminum foil, it’s important to understand its properties and applications.

What is 8021 Aluminum Foil?

8021 aluminum foil is primarily made of an alloy of aluminum, iron, and silicon. It is a high-performance aluminum foil, and these alloys are added to improve its strength and flexibility.

8021 aluminum foil

8021 foil is widely used in various industries such as packaging, pharmaceutical, and battery due to its excellent barrier properties, heat resistance, and flexibility.

8021 aluminum foil has several types in pharmaceutical packagings, such as cold forming blister foil, PTP blister foil, tropical blister foil, alu alu foil, etc.

8021 Aluminum Foil Specifications for Different Applications

Products Type Temper Thickness(mm) Width(mm) Length(mm)
8021 Battery Shell Foil Bare, Mill Finish O, H*2, H*4 0.035 – 0.055 200 – 1840 coil
8021 Pharmaceutical Foil H14, H18 0.018 – 0.2 200 – 1840 coil
8021 Packaging Foil O, H22, H24 0.018 – 0.2 200 – 1840 coil

Learn the production process of 8021 aluminum foil

Properties of 8021 Aluminum

Chemical Composition

8021 aluminum has a chemical composition of 1.2% to 1.7% iron, max 0.15% silicon, max 0.05% copper, max 0.05% magnesium, and the rest is aluminum.

Other, total<= 0.15 %

Chemical composition table of 8021 aluminum

Component Elements Properties Metric English Comments
Aluminum, Al 97.9 – 98.8 % 97.9 – 98.8 % As remainder
Iron, Fe 1.2 – 1.7 % 1.2 – 1.7 %
Silicon, Si ≤ 0.15 % ≤ 0.15 %
Copper, Cu ≤0.05 % ≤ 0.05 %
Other, each ≤ 0.05 % ≤ 0.05 %
Other, total ≤ 0.15 % ≤ 0.15 %

Data Sources:https://www.matweb.com/search/DataSheet.aspx?MatGUID=4d88c0b9eee248a08f756f14a6c027ef&ckck=1

Mechanical Properties

8021 aluminum foil has excellent mechanical properties such as high tensile strength, elongation, and puncture resistance. The typical tensile strength of 8021 aluminum is between 90 and 130 MPa, and the elongation is between 1% and 4%.

Tensile strengthσb (MPa) Elongationδ10 (%) Cupping test value  (mm) Note
90 – 110 13 – 18 6.2 – 7.3 Erichsen Test

Physical Properties

8021 aluminum has good physical properties such as excellent barrier properties, heat resistance, and flexibility. The density of 8021 aluminum is 2.71 g/cm³, and its melting point is between 638°C and 658°C.

Physical Properties Metric English Comments
Density 2.73 g/cc 0.0986 lb/in³ AA; Typical

Applications of 8021 Aluminum Foil

8021 aluminum is widely used in various industries due to its excellent barrier properties, heat resistance, and flexibility.

Medical cold forming alu alu foil

Packaging Industry

8021 aluminum foil is used in the packaging industry for food, pharmaceuticals, and other products that require a high level of protection from moisture, oxygen, and other contaminants. It is commonly used as a packaging material for blister packs, strip packs, and sachets. It is also used for wrapping chocolate, butter, and other dairy products.

Pharmaceutical Industry

In the pharmaceutical industry, 8021 foil is used for packaging tablets, capsules, and other medicines that require a high level of protection from moisture, light, and air. It is also used for packaging medical devices and diagnostic kits.

Battery Industry

8021 aluminum foil is used in the battery industry as a current collector for lithium-ion batteries. It is used as a substrate for the anode or cathode of the battery, providing a smooth and flat surface for the deposition of active materials.


8021 foil is also used in other industries such as insulation, electronics, and aerospace.

Advantages of 8021 Aluminum Foil

Barrier Properties

8021 aluminum foil has excellent barrier properties, providing a high level of protection against moisture, oxygen, and other contaminants. It is also impermeable to light, which makes it ideal for packaging products that are sensitive to light.


8021 foil is highly flexible and can be easily bent, folded, and shaped without cracking or breaking. This makes it easy to use for packaging products of different shapes and sizes.

Heat Resistance

8021 foil has excellent heat resistance, making it ideal for use in high-temperature applications. It can withstand temperatures of up to 300°C without melting or deforming.


8021 aluminum foil is compatible with a wide range of materials, including plastics, paper, and other metals. This makes it easy to use in combination with other packaging materials.

Limitations of 8021 Aluminum Foil

Corrosion Resistance

8021 aluminum foil is not very resistant to corrosion, especially in acidic or alkaline environments. It may corrode over time, which can compromise its barrier properties.


8021 aluminum foil is not as strong as some other aluminum alloys, such as 8011 or 8079. This may limit its use in applications that require high tensile strength or puncture resistance.

What are the benefits of using 8021 aluminum foil

1. Improved quality of molded products

Exceptional stretchability (a 70% increase compared to UACJ Foil 7μ) can improve the quality of molded products that require difficult bending, such as gusset bags, standing pouches and lamination tubes.

2. Improved lamination productivity

High tensile strength (a 40% increase compared to UACJ Foil 7μ) greatly improves productivity by helping prevent tearing during lamination.

3. Improved product appearance thanks to uniform and smooth surfaces

The smoother and more uniform matte surface helps improve the appearance of products, making the foil excellent for labels and other external packaging.

4. Reduced costs

Minimal pinholes (a 70% reduction compared to UACJ Foil 7μ) ensures better performance for applications such as pharmaceutical packaging, electronics packaging, retort packaging and LL containers, all of which require barrier performance. This better performance helps reduce costs.

Comparison with Other Aluminum Foils

8021 Foil VS 8011 Aluminum Foil

8011 aluminum foil is another popular aluminum foil alloy used in the packaging industry. It has similar properties to 8021 aluminum foil, but it is slightly less expensive and has a lower level of purity.

8021 Foil VS 8079 Aluminum Foil

8079 aluminum foil is another high-performance aluminum foil alloy used in the packaging industry. It has excellent barrier properties, but it is less flexible and more expensive than 8021 aluminum foil.

The application of 8021 aluminum foil in pharmaceutical packaging

Cold Forming Blister Foil

Cold forming blister foil is used for packaging medicines that are sensitive to temperature and moisture. It has a PVC layer applied on top of the aluminum base, and can be formed into various shapes using cold forming techniques.

PTP Blister Foil

PTP (Press Through Packaging) blister foil is commonly used for solid dose medicine packaging. It is made of aluminum-based laminates with a heat-sealable PVC layer. The foil is heat-sealed to the blister card, and when the tablet is pushed through the foil, the blister backing material remains attached to the card.

Tropical Blister Foil

Tropical blister foil is designed for use in tropical climates where high humidity levels can impact the quality and efficacy of medication. Tropical blister foil provides excellent resistance to moisture and humidity, ensuring the stability and efficacy of the medication.

Alu Alu Foil

Alu alu foil is a multilayered product consisting of aluminum-based laminates with an adhesive interlayer. It is commonly used for packaging highly sensitive medicines such as vaccines or biologics.


Is 8021 aluminum foil recyclable?

Yes, 8021 aluminum foil is recyclable and can be reused to make new products.

What is the thickness of 8021 foil?

The thickness of 8021 aluminum foil typically ranges from 0.006mm to 0.2mm.

Can 8021 aluminum foil be used for cooking?

No, 8021 aluminum foil is not recommended for cooking or baking as it is not food-grade and may contain impurities.

Can 8021 foil be printed on?

Yes, 8021 aluminum foil can be printed on using various printing methods such as flexography, gravure, and offset printing.

Is 8021 aluminum foil FDA approved?

8021 aluminum foil is not FDA approved, but it can be used in food packaging as long as it meets certain safety and quality standards.


8021 aluminum foil is a high-performance aluminum alloy that is widely used in the packaging, pharmaceutical, and battery industries. Its excellent barrier properties, flexibility, and heat resistance make it an ideal packaging material for products that require a high level of protection.

While 8021 aluminum foil has some limitations, such as its lower corrosion resistance and strength compared to other aluminum alloys, it is still a highly versatile and useful material in many applications.

When choosing an aluminum foil for your packaging needs, it’s important to consider the specific requirements of your product and the properties of different aluminum alloys to make the best choice.

By understanding the versatility and advantages of 8021 aluminum foil, you can make an informed decision about whether it is the right material for your packaging or other applications.

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