Aluminum foil Alloy 1235 8079 8011 8006
Aluminum Foil Alloys 1235, 8079, 8011, and 8006: Choosing the "Personality" Behind the Shine
Aluminum foil often gets described as a commodity, but alloy selection tells a more interesting story. In real production and converting lines, foil behaves less like a generic metal sheet and more like a "material personality" shaped by chemistry, purity, temper, and process standards. Alloys 1235, 8079, 8011, and 8006 are widely used because they cover an unusually broad map of performance needs: from high-purity conductivity and excellent forming, to stronger, more puncture-resistant foil for demanding packaging and industrial applications.
Why these four alloys dominate modern foil production
Alloy 1235: purity-first foil that converts beautifully
1235 is essentially the "clean canvas" alloy. With aluminum content typically at or above 99.35%, it produces foil with excellent ductility, stable surface appearance, and very predictable rolling behavior. Because it contains minimal alloying additions, it tends to offer strong corrosion resistance and consistent electrical/thermal conductivity-useful when foil is used beyond packaging, such as insulation facings, capacitor-related foil stock (depending on specification), and various lamination uses.
From a production perspective, 1235 often rewards operators with smooth gauge control and fewer surprises during high-speed rolling and slitting-especially when surface quality and uniformity matter.
Alloy 8079: the barrier specialist for sensitive packaging
8079 is frequently chosen when the foil must behave like a true barrier material under real packaging stresses. Compared with high-purity grades, 8079's controlled alloying/impurity balance is often used to improve strength and certain mechanical responses at thin gauges. In many markets, 8079 is associated with pharmaceutical blister foil, high-end flexible packaging, and applications where pinhole performance, barrier integrity, and consistent forming behavior are crucial.
A distinctive "8079 mindset" is that it treats the foil not merely as metal thickness, but as a barrier system: thickness, temper, pinholes, wetting/adhesion to coatings, and forming behavior all have to work together.
Alloy 8011: the all-rounder that balances strength, formability, and cost
8011 is one of the most widely used aluminum foil alloys globally because it balances several realities at once: stable rolling, decent strength, good forming capability, and broad acceptability for food-grade and general packaging structures. It often performs reliably across household foil, food containers, bottle neck foil, and laminated packaging.
If 1235 is a clean canvas and 8079 is a barrier specialist, 8011 is the dependable multi-tool-the alloy converters reach for when they need a wide processing window.
Alloy 8006: strength and puncture resistance for "tough foil" demands
8006 is typically selected when higher strength is a design requirement: food container stock, thicker foil for semi-rigid trays, and applications where stiffness, puncture resistance, and shape retention matter. It can deliver stronger mechanical performance than 8011/1235 in many temper conditions, which is why it appears frequently in container foil and demanding industrial packaging formats.
In practice, 8006 is about confidence in handling: fewer edge cracks in forming (when temper is chosen correctly), better resistance to damage, and improved rigidity in the finished structure.
Temper is the "hidden engineering lever" in aluminum foil
Foil alloy selection is only half the decision. Temper defines the internal stress state, recrystallization condition, and forming behavior.
Common foil tempers you'll see with these alloys include:
- O temper (annealed): maximum ductility and softness, excellent for deep forming and lamination where high flexibility is required
- H18 (full hard): high strength and stiffness, used when rigidity and shape retention are needed
- H19 (extra hard): slightly higher hardness than H18 in many supplier practices, used for applications needing extra stiffness
- H22/H24 (strain hardened and partially annealed): a balanced window between strength and formability, commonly used for container and packaging structures where cracking must be controlled
Foil tempering is not "just hardness." It directly influences pinhole behavior, wrinkle formation, dead-fold performance, and how well the foil survives converting steps like embossing, printing, lamination, and die forming.
Typical parameters that matter in real-world procurement
Instead of treating specifications as paperwork, it helps to view foil as a set of controllable parameters that determine runnability and performance:
Thickness range (typical market usage, varies by application and mill capability)
- 1235: commonly used from very thin gauges for lamination up to household/packaging ranges
- 8079: often selected in thinner barrier gauges for pharma and premium packaging
- 8011: broad gauge coverage from household to container and packaging foils
- 8006: frequently used in medium and heavier foil gauges for container and semi-rigid formats
Width, ID/OD, and coil build
Converters often care as much about roll hardness, telescoping control, and edge condition as they do about chemistry. Stable coil build reduces web breaks, improves tension control, and minimizes edge damage.
Surface requirements
Single-side bright vs double-side bright, cleanliness, residual oil limits, and wetting tension (important for printing/lamination). For pharma or food packaging, surface cleanliness and consistent coating adhesion can be as critical as tensile strength.
Mechanical indicators commonly specified
Tensile strength, elongation, and sometimes cupping/forming performance depending on end use. For blister and high barrier packaging, pinhole limits and surface defect control are frequently emphasized.
Implementation standards commonly referenced for aluminum foil
Different regions and industries reference different standards. In practice, aluminum foil for packaging and industrial use is frequently produced and inspected under combinations of these standards (depending on contract and destination market):
- ASTM standards such as ASTM B479 (aluminum and aluminum-alloy foil)
- EN standards such as EN 546 series (aluminum and aluminum alloys - foil)
- GB/T standards commonly used in China, such as GB/T 3198 (h/d tolerances), GB/T 3190 (chemical composition), and applicable foil product standards used by mills and converters
- Packaging and food-contact compliance frameworks may also apply depending on destination market, such as EU food contact requirements or FDA-related compliance expectations, typically addressed via declarations of compliance and supporting test data
Because foil is often part of a laminated structure, additional standards related to printing, lamination bond strength, and migration testing can become relevant even when the base foil itself meets dimensional and mechanical specifications.
Chemical composition: what changes from 1235 to 8006, and why it matters
From a metallurgical perspective, the main "dials" being adjusted across these alloys are iron (Fe) and silicon (Si), with trace elements controlled to protect formability, corrosion performance, and process stability. Higher purity generally improves ductility and conductivity, while controlled Fe/Si can increase strength and influence recrystallization behavior.
Typical Chemical Composition Table (wt.%)
| Alloy | Si | Fe | Cu | Mn | Mg | Zn | Ti | Al |
|---|---|---|---|---|---|---|---|---|
| 1235 | ≤ 0.10 | ≤ 0.65 | ≤ 0.05 | ≤ 0.05 | ≤ 0.05 | ≤ 0.10 | ≤ 0.06 | ≥ 99.35 |
| 8079 | ≤ 0.05–0.15 | 0.70–1.30 | ≤ 0.05 | ≤ 0.05 | ≤ 0.05 | ≤ 0.10 | ≤ 0.08 | Remainder |
| 8011 | ≤ 0.90 | ≤ 1.00 | ≤ 0.10 | ≤ 0.20 | ≤ 0.05 | ≤ 0.10 | ≤ 0.08 | Remainder |
| 8006 | ≤ 0.30 | 1.20–2.00 | ≤ 0.30 | ≤ 0.50 | ≤ 0.10 | ≤ 0.10 | ≤ 0.10 | Remainder |
How to read this table like a foil engineer
- 1235 stays "quiet" chemically, which supports excellent ductility and stable rolling at very thin gauges.
- 8079 typically uses higher Fe with controlled Si, often supporting strength and barrier-oriented performance at thin gauges.
- 8011 offers a pragmatic Fe/Si balance that supports mass-market converting and broad availability.
- 8006 pushes Fe higher (and allows slightly higher Cu/Mn in many specifications), commonly improving strength and rigidity-useful for container stock and tougher foil formats.
Performance mapping: a practical way to choose among 1235, 8079, 8011, and 8006
Barrier integrity and pinhole sensitivity
8079 is often favored where extremely consistent barrier performance is needed at thin gauges, especially in pharmaceutical and high-end packaging. Proper process control matters as much as alloy choice, but 8079 is frequently selected to increase confidence.
Deep forming and high ductility needs
1235-O is a common choice when softness and formability dominate requirements. It also supports stable lamination and good surface behavior when cleanliness and uniformity are prioritized.
General packaging versatility
8011 in O or H22/H24 tempers is widely used because it can be tuned: softer for wrapping and lamination, or stronger for certain formed packaging components.
Stiffness, puncture resistance, and container performance
8006 in H22/H24 or harder conditions is often used when the foil must hold shape, resist handling damage, and perform in formed container applications.
Manufacturing and processing conditions that shape foil behavior
Rolling and intermediate annealing strategy
The rolling schedule and annealing practice can influence grain structure, pinhole tendency, and final mechanical properties. Even within the same alloy and temper, different mills can deliver different "feel" and forming results due to process control differences.
Surface cleanliness and residual rolling oil
For printing, coating, and lamination, cleanliness is not optional. Low and consistent residual oil improves adhesion stability and reduces coating defects. For food and pharma packaging, cleanliness documentation and process hygiene become part of the value proposition.
Slitting quality and edge condition
Edge cracks and burrs are downstream problems waiting to happen. Good edge condition improves converting yield, reduces web breaks, and supports stable high-speed lines.
Applications where each alloy often shines
1235 aluminum foil is commonly used for household foil, cable wrap/insulation facings, general lamination, and applications where softness, cleanliness, and surface consistency are primary.
8079 aluminum foil frequently appears in pharmaceutical blister structures, high barrier laminates, and premium packaging where barrier integrity, pinhole control, and consistent converting behavior are crucial.
8011 aluminum foil is widely used in food packaging, household foil, bottle neck foil, lids, and a broad range of laminated packaging due to its balance of cost, availability, and performance.
8006 aluminum foil is often selected for food container foil, tray stock, and heavier-duty packaging formats that benefit from higher strength, stiffness, and puncture resistance.
A buyer's "distinctive viewpoint": specify foil like you're designing a system
The most effective procurement specs treat aluminum foil not as a single material, but as a system component that must survive printing, lamination, forming, sealing, sterilization, transport, and shelf life. Alloy and temper determine the baseline behavior, but surface, cleanliness, and implementation standards determine whether that behavior shows up consistently on the production floor.
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