Aluminum foil is thin leaves less than 0.2mm thick. It is pliable and can be wrapped around objects. It is often laminated on other materials like plastics to be more useful as in our situation.
It replaces tin foils in 1950s. It is some times mistaken with metallised films which is plastic films coated with a thin layer of aluminum. And metallised films seems to be a better choice for my thesis.
Aluminum foil thicker than 0.025mm is impermeable to oxygen and water. Aluminum has a shiny side and a matte side due to production process. It’s said that the heat is kept out when shiny side is facing out and heat is kepts in when shiny face is facing in, but the difference is negaligibe without instrumentation.
Aluminum foil is mostly used as packaging. It is used in long-life packaging for food, drinks and pharmatheuticals as it is a total barrier for light and oxygen. It is also used to wrap food to preserve it like left food in fridge, take-away food and fast food as it can prevent ordor exchange. Aluminum foil is also ued in thermal insulation due to its high reflectivity, electromeganetic shielding and cooking like barbecue.
Some aluminum foil can be recycled but many aluminum laminates are not recycled due to difficulty in separating the components and low yield.
Aluminum foil is commonly used as foil containers and flexible packaging. In my thesis, aluminum foil is used to reduce radiation heat transfer as an important insulation method..
Here is the reference link: http://en.wikipedia.org/wiki/Aluminium_foil