Aluminum foil is not 100% pure aluminum, though it is very close.
Most household aluminum foil is made from about 92–99% aluminum, with small amounts of other elements like iron and silicon added to enhance strength, durability, and heat resistance.
These additives prevent tearing and improve performance during manufacturing and use.
For example, iron helps the foil withstand high temperatures without breaking.
The exact composition varies slightly depending on regional standards and intended use (e.g., cooking vs. industrial packaging).
However, the aluminum content remains overwhelmingly dominant, making it functionally "pure" for most practical purposes.
Recycled aluminum may also be used in production, but this does not significantly alter its near-pure composition.
