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Aluminum Foil can be categorized based on multiple criteria such as thickness, alloy type, surface state, and application scenarios. The following table summarizes the main classification methods and corresponding characteristics:
| Classification Criterion | Category | Key Specifications/Features | Typical Uses |
| Thickness | Thin Foil (Light Gauge Foil) | Thickness: 0.006mm - 0.02mm; Lightweight, high flexibility | Food wrapping, cigarette packaging, pharmaceutical blister packaging |
| Thick Foil (Heavy Gauge Foil) | Thickness: 0.02mm - 0.2mm; Higher strength, better rigidity | Baking trays, battery casings, industrial heat shields | |
| Alloy Type | 1000 Series (Pure Aluminum Foil) | Aluminum content ≥ 99.0%; Excellent corrosion resistance, high thermal conductivity | Food packaging, heat exchangers, decorative materials |
| 8000 Series (Al-Li Alloy Foil) | Added lithium element; Lightweight, high strength-to-weight ratio | Aerospace components, high-end battery current collectors | |
| 3000 Series (Al-Mn Alloy Foil) | Added manganese element; Balanced strength and formability | Industrial packaging, cooking utensils | |
| Surface State | Plain Foil | No surface coating; Natural aluminum luster | General packaging, household use |
| Coated Foil | Coated with PE, PP, or adhesive; Enhanced barrier or adhesion | Composite packaging, label materials, heat-sealable packaging |
Aluminum Foil's unique performance stems from its ultra-thin structure and the inherent properties of aluminum. The following are its core properties, with 1235 pure aluminum foil (commonly used in packaging) as a typical example:
| Property Index | Typical Value (1235 Foil, O State) | Performance Description & Significance |
| Density (g/cm³) | 2.70 | Lightweight, reducing packaging or product weight without compromising performance |
| Thermal Conductivity (W/(m·K)) | 190 - 200 | Fast heat transfer, suitable for baking, heat preservation, and heat dissipation scenarios |
| Tensile Strength (MPa) | 85 - 120 | Adequate strength to resist tearing during processing and use |
| Elongation (%) | ≥ 20 | Good ductility, enabling folding, wrapping, and forming into complex shapes |
| Oxygen Transmission Rate (cm³/(m²·24h·0.1MPa)) | ≤ 0.5 | Excellent oxygen barrier, preventing oxidation and spoilage of packaged goods |
| Moisture Vapor Transmission Rate (g/(m²·24h)) | ≤ 0.3 | Superior moisture resistance, maintaining dryness of products |
Aluminum Foil's diverse properties make it widely used in multiple industries. The following are the key application areas and specific scenarios:
| Industry | Specific Applications | Preferred Foil Type |
| Food & Beverage Packaging | Chocolate wrapping, instant noodle outer packaging, yogurt lids, takeaway heat preservation bags, baking trays | 1000 Series plain or coated thin foil (0.008mm - 0.02mm) |
| Pharmaceutical Industry | Blister packaging for tablets/capsules, aluminum-plastic composite film for medicinal powder packaging, syringe packaging | 1000 Series high-purity thin foil (0.015mm - 0.015mm), with strict impurity control |
| Electronics Industry | Battery current collectors (lithium-ion batteries), capacitor casings, electromagnetic shielding materials, electronic component packaging | 8000 Series or 1000 Series thick foil (0.015mm - 0.1mm) |
| Aerospace & Automotive | Aerospace component heat shields, automotive exhaust heat shields, lightweight structural parts | 8000 Series high-strength thick foil (0.05mm - 0.2mm) |
| Household & Daily Use | Household wrapping foil, aluminum foil tape, decorative stickers, disposable tableware | 1000 Series plain thin foil (0.01mm - 0.03mm) |
| Industrial Sector | Heat exchanger fins, pipeline insulation layers, chemical corrosion-resistant linings, printing plates | 3000 Series or 5000 Series thick foil (0.03mm - 0.2mm) |
To ensure the performance and usability of aluminum foil, strict quality control is implemented throughout the production process. The core indicators include:
With the increasing emphasis on environmental protection and product quality, the aluminum foil market is showing three main development trends:
In the future, the aluminum foil industry will continue to develop in the direction of high performance, environmental protection, and customization.
