Aluminium Foil is a thin, flexible sheet of aluminium metal, typically 0.006 mm to 0.2 mm (0.0002″ to 0.0079″) in thickness, produced by rolling aluminium ingots into ultra-thin layers. Known for its excellent barrier properties, malleability, and heat conductivity, aluminium foil is widely used in packaging, insulation, and household applications. Its non-toxic, lightweight, and recyclable nature makes it indispensable across industries ranging from food preservation to aerospace.

Product Description

Key Alloy Properties:

1235/1050/1060: High purity (99.3%+ Al) for food packaging and electronics.

8011/8079: Iron and silicon additives for strength and heat resistance (e.g., pharmaceutical blister packs).

1100: Balanced formability and corrosion resistance for industrial uses.

Chemical Composition of Aluminum Foil (Common Alloys)

Aluminum foil is typically made from high-purity or alloyed aluminum, depending on its application. Below are typical compositions for popular foil alloys (values in weight %):

Notes:

1235/1050: High-purity aluminum (≥99% Al) for food packaging and electronics (excellent barrier properties).

8011/8079: Iron (Fe) and silicon (Si) improve strength and heat resistance (used in pharmaceutical and industrial foils).

1100: Balanced ductility and corrosion resistance for general-purpose applications.

Mechanical Properties of Aluminum Foil

Mechanical properties depend on alloy, temper, and thickness. Foil is often supplied in annealed (O) or hard (H18) tempers. Typical values include:

Key Definitions:

Tensile Strength: Maximum stress the foil can withstand before breaking.

Yield Strength: Stress at which permanent deformation begins.

Elongation: Measure of ductility (% stretch before fracture).

Temper:

O (Annealed): Soft, highly ductile (ideal for forming and wrapping).

H18 (Fully Hard): High strength but brittle (used for rigid packaging).

Factors Influencing Properties

• Alloying Elements:

High Purity (1235/1050): Excellent for food safety and electrical conductivity.

Fe/Si (8011/8079): Enhances strength and heat resistance for industrial uses.

• Thickness:

Thinner foils (e.g., 0.006mm) are more flexible but less durable.

Thicker foils (e.g., 0.2mm) offer better puncture resistance.

• Surface Treatment:

Lacquered/Coated: Adds anti-corrosion or non-stick properties.

Embossed: Improves rigidity and aesthetic appeal.