What 8011 Is
8011 belongs to the 8xxx series of aluminum alloys, which are based on aluminum with controlled additions of other elements. In the case of 8011 the principal additions are iron and silicon, which place it in the non-heat-treatable group: its strength comes from cold working during rolling rather than from heat treatment. This makes 8011 well suited to thin-gauge production, where the metal must be rolled down to foil thickness and still keep enough strength to run on high-speed lines. The alloy also shows good heat resistance, good fatigue resistance and good resistance to stress corrosion cracking, which is why it has displaced some other grades in demanding foil applications.
Chemical Composition and Typical Properties
The composition of 8011 is tightly controlled: silicon in the range of 0.50 to 0.90 percent, iron from 0.60 to 1.0 percent, copper up to 0.10 percent, manganese up to 0.20 percent, magnesium up to 0.05 percent, chromium up to 0.05 percent, zinc up to 0.10 percent and titanium up to 0.08 percent, with the balance aluminum. In the foil tempers commonly supplied, the alloy shows typical tensile strength of 125 to 165 MPa and yield strength around 110 MPa, with elongation in the range of 2 to 5 percent depending on gauge and temper. These values give the foil enough rigidity for forming and lidding while keeping it soft enough to fold, crimp and seal on packaging machinery.
Foil and Packaging Applications
Most 8011 production ends up as foil, and its performance is generally considered better than that of pure aluminum foil for many jobs. It is used for pharmaceutical packaging, food packaging, lunch boxes, tape foil, cable foil and bottle cap stock, where the combination of strength, barrier properties and formability matters. Bottle cap liners rely on the alloy dead-fold behavior and sealing performance, and cable foil uses its electrical and mechanical consistency over long coil lengths. Because the alloy is more robust in thin gauges, it is also chosen for applications where 1xxx foil would tear or wrinkle during high-speed converting.
Air-Conditioning Heat Exchanger Fins
8011 foil has become a standard material for fins in refrigeration and air-conditioning equipment, including condensers, coolers, evaporators, radiators and heat exchangers, as well as finned evaporator and condenser units. Fin stock must combine formability, strength and corrosion resistance in gauges of a few hundredths of a millimeter, and 8011 meets those demands while remaining economical at high volume. As the global air-conditioning market expands, particularly in emerging economies where ownership rates are rising with income, demand for 8011 fin foil continues to grow. Fin manufacturers should specify alloy, gauge, temper and the required surface condition, because the fin collar height, louver geometry and coating all depend on consistent material behavior.
Specifying 8011 Foil
When ordering 8011, the specification should state the gauge, temper, width, roll length and surface finish, together with any application-specific requirements such as food-contact compliance for packaging or fin-collar formability for heat exchangers. Chemical composition and mechanical properties should be confirmed against the mill certificate, because trace levels of iron and silicon directly influence strength and formability. For packaging customers, batch traceability and compliance documentation are usually required, and for heat-exchanger customers, consistent thickness across the coil width is essential for uniform fin forming.
FAQ
What elements make up 8011 aluminum?
8011 contains silicon of 0.50 to 0.90 percent and iron of 0.60 to 1.0 percent as its main additions, with small limits on copper, manganese, magnesium, chromium, zinc and titanium, and the balance aluminum.
Is 8011 a heat-treatable alloy?
No. 8011 is strengthened by cold working rather than heat treatment, which is why it is supplied in strain-hardened tempers suited to foil rolling and forming.
What is 8011 foil used for?
It is used for pharmaceutical and food packaging, lunch boxes, tape foil, cable foil, bottle caps and air-conditioner heat exchanger fins.
What is the typical tensile strength of 8011?
In common foil tempers, 8011 shows typical tensile strength of 125 to 165 MPa with yield strength around 110 MPa, depending on gauge and temper.
Why is 8011 preferred for AC fin stock?
It combines the strength, formability and corrosion resistance needed for thin fin stock at economical cost, which is why it dominates air-conditioner heat exchanger fin production.