3102 mill finish aluminum foil
3102 mill finish aluminum foil is a versatile and widely used aluminum alloy product, prized for its combination of excellent formability, moderate strength, and corrosion resistance. Manufactured primarily from the 3xxx series aluminum alloy family, this product is typically supplied in a mill finish condition, providing a bright, natural, matte surface ideally suited for a variety of industrial applications including packaging, lamination, insulation, and more.
Alloy and Temper Information
- Alloy Number: 3102
- Series: 3000 (Aluminum-Manganese Alloys)
- Temper Designations Commonly Available: O (annealed - soft), H19 (strain-hardened, almost full hard)
- Finish: Mill finish (natural/uncoated)
Properties of 3102 Alloy
3102 belongs to the manganese-containing 3000 series aluminum alloys. The manganese content increases strength without sacrificing corrosion resistance or formability. It offers a good balance between strength and ductility, accommodating complex forming and shaping operations needed for foil.
Chemical Composition
The chemical composition range for the 3102 alloy as per ASTM B209 specification is illustrated below:
| Element | Minimum (%) | Maximum (%) |
|---|---|---|
| Aluminum (Al) | Balance | Balance |
| Manganese (Mn) | 1.0 | 1.5 |
| Iron (Fe) | - | 0.7 |
| Silicon (Si) | - | 0.6 |
| Copper (Cu) | - | 0.10 |
| Zinc (Zn) | - | 0.10 |
| Titanium (Ti) | - | 0.15 |
| Others (Each) | - | 0.05 |
| Others (Total) | - | 0.10 |
Physical and Mechanical Properties
| Property | Value | Units |
|---|---|---|
| Density | 2.70 | g/cm³ |
| Melting Point | 645 | °C |
| Coefficient of Thermal Expansion | 23.4 × 10⁻⁶ | m/m°C |
| Thermal Conductivity | ~220 | W/m·K |
| Electrical Resistivity | ~3.5 × 10⁻⁸ | Ω·m |
Typical Mechanical Values for O Temper (annealed):
| Property | Value | Units |
|---|---|---|
| Tensile Strength | 100 - 150 | MPa |
| Yield Strength | 40 - 80 | MPa |
| Elongation (in 50 mm) | ≥ 15 | % |
Note: Values may vary depending on process specifics and tempering level.
Production and Surface Characteristics
3102 mill finish aluminum foil is produced via rolling processes to achieve the required thickness, typically ranging from a few micrometers (for extremely thin foil) up to 0.2 mm for heavier foil sheets. The mill finish shows a dull matte, free from coatings or polishing, and offers excellent adhesion properties for secondary coatings or laminations.
Applications
- Flexible Packaging: Food wraps, candy wrappers, and hygienic packaging requiring non-toxic, corrosion-resistant material.
- Electrical insulation: Foils for capacitors and transformer insulation layers.
- Thermal insulation: Used in building insulation materials where lightweight and reflective properties are needed.
- Household foil products: Typical hardened or annealed foil for kitchen use.
- Industrial applications: Protective and decorative laminations, cable wraps, and decorative foil products.
Manufacturing Standards and Specifications
- ASTM B479/B209: Standard Specification for Aluminum and Aluminum-Alloy Foil.
- Aluminum Association: Designation for 3102 alloy in foil form.
- RoHS and REACH compliant: Free from hazardous chemical constituents harmful to human health or the environment.
Storage and Handling Recommendations
- Store aluminum foil rolls in a dry environment to prevent oxidation or corrosion.
- Prevent mechanical damage by avoiding sharp impacts or bending beyond specification.
- Handle with clean, dry hands or use gloves to reduce contamination of the foil surface which can affect downstream processing.
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