Why the 8011 Alloy
8011 is an aluminum-iron-silicon alloy from the 8xxx series, widely used for foil because it combines good formability with the mechanical strength needed for packaging and industrial applications. Its exceptional physical characteristics, superb surface quality, and steady processing performance make it one of the most versatile foil alloys. Typical applications include air-conditioner heat-exchanger fins, bottle cap liner materials, food packaging, and pharmaceutical packaging, where the foil must run reliably on high-speed converting lines.
Mechanical Properties
The mechanical behavior of 8011 foil is controlled by the annealing temper. Depending on the temper - commonly O, H18, H22, and others - the foil can deliver a maximum tensile strength of about 125 MPa with 10% elongation, which is well suited to embossing, laminating, and deep drawing. Stable yield strength ensures high forming efficiency and dependable bottle cap sealing, while the combination of strength and ductility allows the foil to survive the bending and stretching of packaging processes without tearing.
Dimensional Precision
Accurate control of thickness and width is essential for foil users. Advanced rolling and cutting equipment holds thickness tolerance within about +/-2% and width deviation to less than +/-0.1 mm, with custom thicknesses available in the range of about 0.006 mm to 0.2 mm. Tight gauge control means predictable material usage per package and consistent performance on converting machinery, while precise width tolerance reduces trim waste and improves printing registration.
Surface Quality
Surface quality determines how the foil looks, prints, and converts. High surface gloss with mirror brightness above 85% gives packaging an attractive appearance, and a minimal pinhole count - finished product can achieve zero pinholes per square meter for pinholes smaller than 0.3 mm - protects the barrier properties that food and pharmaceutical packaging depend on. The surface is free of wrinkles, black spots, oil stains, and foreign inclusions, which keeps printing and lamination defect-free.
Adhesion and Dyne Level
Adhesion is the foundation of lamination and printing quality. Precision corona treatment and degreasing raise the surface tension to a dyne level of about 52 dyn/cm, significantly higher than typical industry requirements. This high dyne level substantially improves the adhesion of coatings, laminates, and inks, preventing peeling and delamination in finished packaging. Complete degreasing ensures compatibility with the adhesive systems used in food and pharmaceutical packaging, producing laminates that are free of bubbles and resistant to peeling.
Coil Consistency
Consistent coil quality keeps production lines running smoothly. Trimmed edges with burrs kept to less than 20 microns, flat end faces with no collapsed edges, and proper winding tension prevent telescoping and edge damage during unwinding. Foil is available on 76 mm and 152 mm steel or paper cores, compatible with a wide range of converting equipment, so converters can spool the material directly into printing, laminating, and slitting lines without rework.
FAQ
Q: What is 8011 aluminum foil used for?
A: Air-conditioner heat-exchanger fins, bottle cap liner materials, food packaging, and pharmaceutical packaging, where strength, barrier properties, and surface quality are required.
Q: What tensile strength does 8011 foil reach?
A: Depending on the annealing temper, the foil can reach a maximum tensile strength of about 125 MPa with about 10% elongation.
Q: How tight are the thickness tolerances of 8011 foil?
A: Thickness tolerance is typically within about +/-2%, with width deviation under +/-0.1 mm and custom thicknesses from about 0.006 mm to 0.2 mm.
Q: Why is the dyne level important for foil?
A: It measures surface tension: a level around 52 dyn/cm ensures strong adhesion of coatings, laminates, and inks, preventing peeling and delamination.
Q: What pinhole quality can 8011 foil achieve?
A: Finished product can achieve zero pinholes per square meter for pinholes smaller than 0.3 mm, protecting the barrier properties of the packaging.
Q: What core sizes are available for 8011 foil coils?
A: Coils are available on 76 mm and 152 mm steel or paper cores, compatible with a wide range of converting equipment.
