Metallised films ( or metalized films ) are polymer films coated with a thin layer of metal , usually aluminium . 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 . Its burning caused the crash of Swissair Flight 111 in 1998 that killed 229 people
Swissair Flight 111
Swissair Flight 111
Metallised film