Knowra Aluminium foil Aluminium foil Aluminium foil is a thin, flexible sheet of aluminium made by rolling metal into a very small thickness. It blocks light, air, moisture, and many odors, making it useful in packaging, cooking, insulation, and electrical applications.
Aluminium : Aluminium is a lightweight, silvery chemical element with the symbol Al and atomic number 13. Foil inherits its low density, conductivity, and oxide-forming surface from this metal.
Water vapor transmission rate : Water vapor transmission rate measures how quickly water vapor passes through a material under specified conditions. Foil’s near-impermeability to water vapor helps keep packaged contents dry.
Household aluminium foil : Household aluminium foil is thin aluminium sheet sold for wrapping, covering, and cooking food. It is the familiar consumer form, optimized for easy tearing and handling.
Aluminium sheet : Aluminium sheet is flat-rolled aluminium thicker than foil, used in structural, automotive, and household products. Its greater thickness gives it rigidity that wrapping foil does not have.
Malleability : Malleability is a material’s ability to deform under compression into thin sheets without breaking. This property lets aluminium be rolled to foil thickness.
Gas barrier : A gas barrier is a material’s resistance to the passage of gases such as oxygen and carbon dioxide. Continuous foil blocks oxygen far more effectively than most flexible packaging films.
Aluminium foil container : An aluminium foil container is a formed, thin-walled vessel used to hold, cook, or transport food. Formed foil extends the material from wrapping into disposable trays and pans.
Metallized film : Metallized film is a polymer film coated with a very thin layer of metal, usually aluminium. It looks reflective like foil but typically offers a less complete barrier.
Rolling (metalworking) : Rolling is a metalworking process that reduces material thickness by passing it between rotating rolls. Repeated rolling is the manufacturing step that turns aluminium stock into foil.
Thermal radiation : Thermal radiation is energy emitted by matter as electromagnetic waves because of its temperature. A clean, shiny foil surface reflects much incoming and outgoing thermal radiation.
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