What is the tensile strength of 1235 aluminum foil?

As a supplier of 1235 aluminum foil, I often receive inquiries about its various properties, and one of the most frequently asked questions is about its tensile strength. In this blog post, I will delve into the concept of tensile strength, explain what affects the tensile strength of 1235 aluminum foil, and compare it with other common aluminum foils.

Understanding Tensile Strength

Tensile strength is a fundamental mechanical property that measures the maximum amount of tensile (pulling) stress a material can withstand before it breaks or fails. It is typically expressed in units of force per unit area, such as megapascals (MPa) or pounds per square inch (psi). When a material is subjected to a tensile force, it experiences internal stresses that cause it to stretch. The tensile strength indicates the point at which the material can no longer withstand the applied force and begins to deform permanently or fracture.

For aluminum foils, tensile strength is a crucial property as it determines their performance in various applications. In industries such as packaging, where foils need to be wrapped around products and sealed, a sufficient tensile strength ensures that the foil does not tear during handling. In electrical applications, the foil must maintain its integrity under mechanical stress, and a high tensile strength helps prevent breakage that could lead to electrical failures.

Tensile Strength of 1235 Aluminum Foil

1235 aluminum foil is a popular choice in many industries due to its excellent combination of properties. The tensile strength of 1235 aluminum foil can vary depending on several factors, including its thickness, temper, and manufacturing process.

Typically, the tensile strength of 1235 aluminum foil in the annealed (O temper) condition ranges from about 70 - 110 MPa. In the H14 temper, which is a semi - hard temper, the tensile strength can increase to around 110 - 145 MPa. For the H18 temper, which is a full - hard temper, the tensile strength can reach up to 145 - 180 MPa.

The thickness of the foil also plays a significant role in its tensile strength. Generally, thicker foils tend to have higher tensile strengths because they have more material to resist the applied force. However, this relationship is not always linear, as other factors such as the internal structure of the foil can also influence its strength.

Factors Affecting the Tensile Strength of 1235 Aluminum Foil

Alloy Composition

1235 aluminum is a commercially pure aluminum alloy with a minimum aluminum content of 99.35%. The small amount of impurities and alloying elements can affect the tensile strength. For example, iron and silicon are common impurities in 1235 aluminum. A slight increase in the iron content can enhance the strength of the alloy by forming intermetallic compounds that impede the movement of dislocations within the crystal lattice, thereby increasing the resistance to deformation.

Temper

As mentioned earlier, the temper of the aluminum foil has a significant impact on its tensile strength. The annealing process (O temper) softens the foil by relieving internal stresses and allowing the grains to recrystallize. This results in a lower tensile strength but higher ductility, making the foil more suitable for applications where it needs to be formed or shaped. On the other hand, cold - rolling processes used to achieve H - tempers, such as H14 and H18, increase the strength of the foil by work - hardening the material. During cold - rolling, the grains are deformed, and dislocations are introduced, which makes it more difficult for the material to deform further, thus increasing the tensile strength.

Manufacturing Process

The manufacturing process of 1235 aluminum foil can also affect its tensile strength. The quality of the casting process, the rolling parameters (such as rolling speed, reduction ratio), and the heat treatment conditions all play a role. For example, a well - controlled casting process can ensure a uniform microstructure in the aluminum ingot, which is beneficial for achieving consistent tensile strength in the final foil product. Additionally, proper heat treatment can optimize the properties of the foil by controlling the size and distribution of the grains.

Comparison with Other Aluminum Foils

1100 Aluminum Foil

1100 Aluminum Foil is another commercially pure aluminum alloy with a minimum aluminum content of 99.0%. In general, the tensile strength of 1100 aluminum foil is slightly lower than that of 1235 aluminum foil. In the annealed condition, the tensile strength of 1100 aluminum foil is around 60 - 100 MPa, while in the H14 temper, it is about 100 - 130 MPa. The lower strength of 1100 aluminum foil can be attributed to its slightly lower purity and different impurity levels compared to 1235 aluminum.

1060 Aluminum Foil

1060 Aluminum Foil has a minimum aluminum content of 99.6%. Similar to 1235 and 1100 aluminum foils, its tensile strength also depends on the temper. In the annealed state, the tensile strength of 1060 aluminum foil is approximately 60 - 95 MPa. In the H14 temper, it can reach 95 - 125 MPa. Compared to 1235 aluminum foil, 1060 aluminum foil has a lower tensile strength, mainly due to its different alloy composition and the resulting microstructure.

Applications Based on Tensile Strength

The tensile strength of 1235 aluminum foil makes it suitable for a wide range of applications.

Packaging

In the packaging industry, 1235 aluminum foil is widely used for food packaging, pharmaceutical packaging, and other consumer product packaging. Its moderate to high tensile strength ensures that the foil can be easily handled during the packaging process without tearing. For example, in the packaging of chocolate bars, the foil needs to be wrapped around the product tightly and sealed. The tensile strength of 1235 aluminum foil allows it to withstand the stretching and bending forces during this process, providing a reliable barrier against moisture, oxygen, and light.

Electrical Applications

In electrical applications, such as electromagnetic shielding and capacitor foils, the tensile strength of 1235 aluminum foil is important for maintaining the integrity of the electrical components. The foil must be able to withstand mechanical stress during installation and operation without breaking. For instance, in electromagnetic shielding applications, the foil is often wrapped around electrical equipment to prevent electromagnetic interference. The tensile strength of the foil ensures that it can be applied smoothly and remain intact over time.

Contact Us for Procurement

If you are interested in purchasing 1235 Aluminum Foil for your specific application, we are here to help. Our company offers high - quality 1235 aluminum foil with consistent tensile strength and other excellent properties. We can provide customized solutions based on your requirements, including different thicknesses, tempers, and surface finishes. Contact us to discuss your procurement needs and start a successful business partnership.

References

• Aluminum Association. Aluminum Standards and Data.
• ASM Handbook Volume 2: Properties and Selection: Nonferrous Alloys and Special - Purpose Materials.
• Various research papers on the mechanical properties of aluminum alloys.