What is Aluminum Foil? A Complete Guide
Your comprehensive resource on aluminum foil — types, alloys, specifications, applications, and how to source from top suppliers.
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What is Aluminum Foil?
Aluminum foil is a thin sheet of aluminum metal, typically ranging from 0.006mm (6μm) to 0.2mm (200μm) in thickness. Produced by rolling aluminum ingots through precision rolling mills, it is one of the most versatile metallic materials in modern industry.
Key properties that make aluminum foil indispensable:
- Excellent barrier — blocks light, oxygen, moisture, and bacteria
- High thermal conductivity — ideal for heat exchange and cooking
- Lightweight — density of only 2.7 g/cm³
- Recyclable — 100% recyclable without quality loss
- Non-toxic — safe for food and pharmaceutical contact
- Formable — can be laminated, coated, printed, and embossed
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Types of Aluminum Foil
By Thickness
| Category | Thickness | Common Applications |
|---|---|---|
| Double-zero foil | 6–9 μm (0.006–0.009mm) | Battery cathode, capacitor, packaging lamination |
| Single-zero foil | 10–100 μm (0.01–0.1mm) | Packaging, HVAC, labels, tapes |
| Heavy gauge foil | 100–200 μm (0.1–0.2mm) | Containers, industrial insulation |
By Application
| Type | Description | Key Markets |
|---|---|---|
| Battery foil | Ultra-thin foil for lithium-ion battery cathode current collectors | EV, energy storage |
| Packaging foil | Food-grade foil for wrapping, containers, and lamination | Food & beverage |
| HVAC foil | Hydrophilic or bare foil for air conditioner heat exchangers | Home appliances |
| Pharmaceutical foil | PTP (Press Through Pack) foil for blister packaging | Pharmaceuticals |
| Household foil | Consumer-grade rolls for cooking and kitchen use | Retail |
| Capacitor foil | Electrolytic-grade foil for electrolytic capacitors | Electronics |
| Cable foil | Foil for cable shielding | Telecommunications |
| Decoration foil | Printed or colored foil for interior decoration | Construction |
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Common Aluminum Foil Alloys
Aluminum foil is produced from various alloy series, each designed for specific performance requirements:
1xxx Series (Pure Aluminum)
| Alloy | Key Properties | Typical Use |
|---|---|---|
| 1235 | ≥99.35% Al, excellent formability | Packaging, household foil |
| 1145 | ≥99.45% Al, good conductivity | Capacitor foil |
| 1100 | ≥99.0% Al, balanced properties | General purpose |
8xxx Series (Al-Fe-Si)
| Alloy | Key Properties | Typical Use |
|---|---|---|
| 8011 | Good strength + formability | Pharmaceutical foil, bottle caps |
| 8021 | Higher strength | Deep-draw containers |
| 8079 | Excellent moisture barrier | Food packaging lamination |
| 8006 | High strength at thin gauges | Battery foil |
3xxx Series (Al-Mn)
| Alloy | Key Properties | Typical Use |
|---|---|---|
| 3003 | Good corrosion resistance | Heat exchangers, containers |
| 3004 | Higher strength than 3003 | Beverage can ends |
Selection Guide
- Need maximum thinness? → 1235, 8006 (battery foil)
- Need barrier properties? → 8079, 8011 (packaging)
- Need strength? → 8021, 3003 (containers, HVAC)
- Need conductivity? → 1145, 1A30 (capacitor)
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Major Applications in Detail
1. Lithium Battery Foil
The fastest-growing segment in the aluminum foil industry. Battery foil serves as the cathode current collector in lithium-ion batteries.
Specifications:
- Thickness: 12–16 μm (trending toward thinner gauges)
- Alloy: 1235, 8006
- Width: 200–1500mm
- Surface: Clean, burr-free, uniform thickness
Why it matters: Global EV sales are projected to reach 40+ million units by 2030, driving massive demand for battery foil. China dominates this market with over 80% of global production capacity.
2. Packaging Aluminum Foil
The largest volume application for aluminum foil globally.
Applications:
- Food wrapping and containers
- Beverage carton lamination (Tetra Pak-style)
- Flexible packaging (snack bags, coffee capsules)
- Bottle caps and closures
Specifications:
- Thickness: 6–50 μm
- Alloys: 1235, 8011, 8079
- Often laminated with PE, PET, or paper
3. HVAC / Heat Exchanger Foil
Used in air conditioning and refrigeration systems as heat exchange fins.
Specifications:
- Thickness: 80–200 μm
- Alloys: 3003, 8006
- Often coated: hydrophilic (for AC) or hydrophobic (for refrigeration)
4. Pharmaceutical (PTP) Foil
Used for blister packaging of tablets and capsules.
Specifications:
- Thickness: 20–30 μm (foil) + heat-seal lacquer
- Alloy: 8011, 8021
- Must meet FDA/EMA pharmaceutical standards
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How Aluminum Foil is Made
Production Process
Aluminum Ingot / Billet
↓
Hot Rolling (to ~6mm)
↓
Cold Rolling (to target thickness)
↓
Annealing (softening, if needed)
↓
Foil Rolling (final gauge)
↓
Slitting / Cutting
↓
Surface Treatment (coating, laminating — if needed)
↓
Packaging & ShippingKey Quality Parameters
| Parameter | Why It Matters |
|---|---|
| Thickness tolerance | ±5% or better for premium grades |
| Surface quality | Pinholes, scratches, oil stains affect barrier performance |
| Mechanical strength | Must withstand forming, deep-drawing, and winding |
| Pinhole count | Fewer pinholes = better barrier; critical for packaging |
| Flatness | Critical for lamination and printing |
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Global Market Overview
Production by Region (2024 estimates)
| Region | Share | Key Countries |
|---|---|---|
| Asia-Pacific | ~65% | China (dominant), Japan, South Korea |
| Europe | ~18% | Germany, France, Italy |
| North America | ~10% | USA |
| Others | ~7% | Middle East, South America |
Market Size
- Global production: ~7 million tonnes/year
- Market value: ~$30 billion (estimated)
- Growth driver: EV batteries (fastest growing segment)
- Key trend: Thinner gauges, higher quality, sustainable production
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How to Choose an Aluminum Foil Supplier
10-Point Checklist
- Production capacity — Can they handle your volume?
- Product range — Do they produce the gauge and alloy you need?
- Quality certifications — ISO 9001, IATF 16949 (automotive), FDA (food/pharma)?
- Equipment level — Modern rolling mills from SMS, Danieli, or Achenbach?
- Quality control — In-house testing labs with pinhole detectors, spectrometers?
- Delivery reliability — On-time delivery track record?
- Technical support — Can they help with alloy selection and specifications?
- Export experience — Familiar with international trade, packaging, shipping?
- Price competitiveness — Competitive but not at the expense of quality?
- References — Can they provide customer references in your industry?
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Glossary of Key Terms
| Term | Definition |
|---|---|
| μm (micron) | One millionth of a meter; standard unit for foil thickness |
| Gauge | Thickness of the foil |
| Alloy | Aluminum combined with other elements for specific properties |
| Temper | Hardness level (O=soft, H1x=strain hardened, T=heat treated) |
| Pinhole | Tiny hole through the foil; fewer = better barrier |
| Hydrophilic | Water-attracting coating on HVAC fins |
| PTP | Press Through Pack; pharmaceutical blister packaging |
| Double-zero | Foil thinner than 0.01mm (10μm) |
| Slitting | Cutting wide rolls into narrower rolls |
| Annealing | Heat treatment to soften and recrystallize the metal |
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Last updated: April 2026 | Alfoil World — Your Aluminum Foil Partner