Metallised films (or metalized films) are polymer films coated with a thin layer of metal, usually aluminum.
They offer the glossy metallic appearance of an aluminium foil at a reduced weight and cost.
Metallised films are widely used for decorative purposes and food packaging,
and also for specialty applications including insulation and electronics.
The coating also reduces the permeability of the film to light, water and oxygen.
The properties of the film remain, such as higher toughness, the ability to be heat sealed,
and a lower density at a lower cost than an aluminum foil.
This gives metallised films some advantages over aluminum foil and aluminum foil laminates.
It was thought that metallised films would become a replacement for aluminum foil laminates,
but current films still cannot match the barrier properties of foil.
Some very high barrier metallised films are available using EVOH, but are not yet cost effective against foil laminates