In the flexible packaging lamination supply chain, large aluminum foil rolls serve as an indispensable core substrate. Thanks to their excellent barrier properties—blocking oxygen, water, light, and moisture—as well as superior sealing capabilities, these rolls are widely used in sectors such as food, pharmaceuticals, personal care products, and retort packaging. They are critical materials for preserving the quality of contents and extending product shelf life.
The two aluminum foil grades predominantly used in the flexible packaging lamination sector are 1235 (pure aluminum) and 8011 (aluminum alloy). While they may appear similar at first glance, they differ significantly in material composition, physical properties, processing suitability, and application scenarios.
I. Material Properties
The fundamental difference between 1235 and 8011 aluminum foils stems from their distinct alloy compositions, which dictate their respective performance characteristics.
1235 O aluminum foil belongs to the 1000-series pure aluminum family; with an aluminum content of ≥99.35% and minimal impurities, it is a high-purity, soft aluminum foil. Its high material purity results in an exceptionally smooth surface and uniform color, free from noticeable oil stains or oxidation spots. The substrate offers outstanding toughness and ductility, making it ideal for ultra-thin rolling processes; it can be produced as extremely thin, uniform large rolls that fully meet the requirements for high-end flexible packaging substrates.
8011 aluminum foil belongs to the 8000-series aluminum-iron-silicon alloy family, created by precisely adding trace amounts of iron and silicon to pure aluminum. Unlike pure aluminum, the inclusion of these alloying elements significantly enhances structural stability, markedly improving the substrate's stiffness, tensile strength, and tear resistance while maintaining good flexibility and processability. It is a versatile lamination material that balances strength with cost-effectiveness and is currently one of the most widely used aluminum foil grades in the flexible packaging industry.
II. Comparison of Key Performance Characteristics
Flexible packaging lamination places extremely high demands on large-roll aluminum foil regarding pinhole levels, flexibility, lamination adhesion, and formability. The differences in key performance attributes between these two types of foil make them suitable for distinct production processes and packaging requirements.
1. 1235 Aluminum Foil (Large Roll): High Purity and Flexibility; Ideal for High-End, Precision Lamination
The primary advantage of 1235 aluminum foil is its high purity and low impurity content. Consequently, the base material exhibits a very low pinhole rate and superior barrier properties, effectively blocking oxygen, moisture, and UV rays to maximize the stability of the packaged contents.
It also offers excellent ductility and bonding characteristics; when laminated with films such as PE, PET, or CPP, it ensures uniform and stable adhesion, minimizing quality issues like delamination, blistering, or wrinkling.
During further processing, 1235 aluminum foil is well-suited for deep drawing, irregular shaping, and high-temperature lamination. It resists brittle fracture and deformation during processing, resulting in finished packaging that is flat and smooth with a refined texture.
However, due to the inherent characteristics of pure aluminum, its mechanical strength and stiffness are relatively low. Its resistance to tearing from external forces and compression is inferior to that of alloyed aluminum foil, making it unsuitable for rigid composite packaging structures that require high structural support.
2. 8011 Aluminum Foil (Large Roll): Strong, Tough, and Durable; Ideal for General Mass-Production Lamination
Thanks to its alloy composition, 8011 O aluminum foil strikes a perfect balance between strength and flexibility, offering tensile, tear, and compression resistance that far exceeds that of 1235 pure aluminum foil. On high-speed lamination lines, large rolls of 8011 foil resist stretching, deformation, and breakage. It is compatible with large-scale mass-production processes—such as high-speed coating, printing, and slitting—offering greater production tolerance and effectively reducing material waste.
Additionally, this foil demonstrates excellent resistance to bending and abrasion, providing superior stiffness in the finished package. It maintains its shape well without collapsing, making it ideal for flexible packaging structures that require three-dimensional forming, such as stand-up pouches, zipper bags, and retort pouches. Its only drawback is that its purity is slightly lower than that of 1235 aluminum foil, making it somewhat less suitable for high-end applications demanding ultra-high cleanliness and barrier properties; however, it fully meets the quality standards for the vast majority of consumer flexible packaging and offers an outstanding cost-performance ratio.
III. How to Choose it
1. Core Application Scenarios for 1235 Aluminum Foil Jumbo Rolls
Targeting market segments that prioritize high cleanliness, superior barrier properties, and premium quality, this foil is primarily used for high-end packaging where material safety, sealing integrity, and aesthetic texture are critical.
Common applications include sealed composite packaging for premium chocolates, candies, and baked goods; aseptic Tetra Pak cartons; food preservation films; and high-precision composite packaging for pharmaceuticals and electronic shielding substrates.
These applications demand zero tolerance for pinholes, impurities, or odors; the high-purity characteristics of 1235 aluminum foil perfectly align with these rigorous production and quality control standards.
2. Core Application Scenarios for 8011 Aluminum Foil Jumbo Rolls
Targeting mass-market applications that prioritize high strength and cost-effectiveness, this foil serves as a primary substrate for mainstream flexible packaging. It is widely used in consumer packaging such as snack bags, composite bags for cooked meat products, sachets for personal care and household products, facial mask laminates, and easy-peel lids for milk powder and beverage cups. It is also a common material for pharmaceutical PTP (Press-Through-Pack) blister foils and standard industrial composite packaging.
In packaging scenarios requiring retortability (withstandng high-temperature cooking), temperature resistance, 3D forming capabilities, and compression resistance during long-distance transport, the strength and toughness of 8011 aluminum foil offer distinct advantages, effectively preventing issues such as package rupture or air leakage.