Aluminium Foil is aluminium prepared in thin metal leaves with a thickness less than 0.2 mm

(7.9 mils); thinner gauges down to 6 micrometres (0.24 mils) are also commonly used.

It can be easily converted to thin sheets and folded, rolled or packed. Aluminium foil acts as a total barrier to light and oxygen (which cause fats to oxidise or become rancid), odours and flavours, moistness, and germs, and so it is used broadly in food and pharmaceutical packaging, including long-life packs (aseptic packaging) for drinks and dairy goods, which allows storing without refrigeration. Aluminium foil containers and trays are used to bake pies and to pack takeaway meals, ready snacks and long life pet foods.