(or aluminum foil
), often referred to with the misnomer tin foil
, is aluminium
prepared in thin metal leaves
with a thickness less than ; thinner gauges down to are also commonly used. In the United States, foils are commonly gauged in thousandths of an inch or mils
. Standard household foil is typically thick, and heavy duty household foil is typically . The foil
is pliable, and can be readily bent or wrapped around objects. Thin foils are fragile and are sometimes laminate
d to other materials such as plastic
s or paper
to make them more useful. Aluminium foil supplanted tin foil
in the mid 20th century.
Annual production of aluminium foil was approximately in Europe and in the U.S. in 2003. Aluminum Association (USA)
Approximately 75% of aluminium foil is used for packaging
, and chemical products, and 25% used for industrial applications (e.g. thermal insulation, cables and electronics). It can be recycled
In North America
, aluminium foil is known as aluminum foil. It was popularised by Reynolds Metals
, the leading manufacturer in North America. In the United Kingdom
and United States
it is, informally, widely called tin foil, for historical reasons (similar to how aluminium can
s are often still called " tin can
s"). Metallised film
s are sometimes mistaken for aluminium foil, but are actually polymer films coated
with a thin layer of aluminium. In Australia
, aluminium foil is widely called alfoil.
Before aluminium foil
Foil made from a thin leaf of tin
was commercially available before its aluminium counterpart. Tin foil
was marketed commercially from the late nineteenth into the early twentieth century. The term "tin foil" survives in the English language as a term for the newer aluminium foil. Tin foil is less malleable
than aluminium foil and tends to give a slight tin taste to food wrapped in it. Tin foil has been supplanted by aluminium and other materials for wrapping food.
The first audio recordings on phonograph cylinders
were made on tin foil.
The first aluminium foil
Tin was first replaced by aluminium in 1910, when the first aluminium foil rolling plant, "Dr. Lauber, Neher & Cie." was opened in Emmishofen
. The plant, owned by J.G. Neher & Sons, the aluminium manufacturers, started in 1886 in Schaffhausen
, Switzerland, at the foot of the Rhine Falls
, capturing the falls' energy to produce aluminium. Neher's sons, together with Dr. Lauber, discovered the endless rolling process and the use of aluminium foil as a protective barrier in December 1907.
In 1911, Bern-based Tobler began wrapping its chocolate bars in aluminium foil, including the unique triangular
chocolate bar, Toblerone
. By 1912, aluminium foil was being used by Maggi
(today a Nestlé brand) to pack soups and stock cubes.
The first use of foil in the United States was in 1913 for wrapping Life Savers
, candy bars, and gum.Hanlon, J. (1992). 1st ed. Handbook of Package Engineering, Lancaster, Pennsylvania, and Technomic Publishing: . Chapter 3 Films and Foils. Processes evolved over time to include the use of print, colour, lacquer, laminate and the embossing
of the aluminium.
showing a thickness of ]]
Aluminium foil is produced by rolling sheet ingots
cast from molten billet aluminium
, then re-rolling on sheet and foil rolling mills to the desired thickness, or by continuously casting and cold rolling. To maintain a constant thickness in aluminium foil production, beta radiation
is passed through the foil to a sensor on the other side. If the intensity becomes too high, then the rollers adjust, increasing the thickness. If the intensities become too low and the foil has become too thick, the rollers apply more pressure, causing the foil to be made thinner.
The continuous casting method is much less energy intensive and has become the preferred process.Robertson, G. (2006). 2nd ed. Food Packaging, Principles and Practise, Boca Raton, FL, Taylor & Francis Group: . Chapter 7 Metal Packaging Materials. For thicknesses below , two layers are usually put together for the final pass and afterwards separated which produces foil with one bright side and one matte side. The two sides in contact with each other are matte and the exterior sides become bright; this is done to reduce tearing, increase production rates, control thickness, and get around the need for a smaller diameter roller.
is needed during the rolling stages; otherwise, the foil surface can become marked with a herringbone pattern
. These lubricants are sprayed on the foil surface before passing through the mill rolls. Kerosene
based lubricants are commonly used, although oils approved for food contact must be used for foil intended for food packaging.
Aluminium becomes work hardened during the cold rolling process and is annealed
for most purposes. The rolls of foil are heated until the degree of softness is reached, which may be up to for 12 hours. During this heating, the lubricating oils are burned off, leaving a dry surface. Lubricant oils may not be completely burnt off for hard temper rolls, which can make subsequent coating or printing more difficult.
The rolls of aluminium foil are then slit on slitter rewinding
machines into smaller rolls. Roll slitting and rewinding is an essential part of the finishing process.
of aluminium foil on the back of an intumescent
Aluminium foils thicker than are impermeable to oxygen and water. Foils thinner than this become slightly permeable due to minute pinholes caused by the production process.
Aluminium foil has a shiny side and a matte side. The shiny side is produced when the aluminium is rolled during the final pass. It is difficult to produce rollers with a gap fine enough to cope with the foil gauge, therefore, for the final pass, two sheets are rolled at the same time, doubling the thickness of the gauge at entry to the rollers. When the sheets are later separated, the inside surface is dull, and the outside surface is shiny. This difference in the finish has led to the perception that favouring a side has an effect when cooking. While many believe (wrongly) that the different properties keep heat out when wrapped with the shiny finish facing out, and keep heat in with the shiny finish facing inwards, the actual difference is imperceptible without instrumentation. Increased reflectivity decreases both absorption and emission
of radiation. Foil may have a non-stick coating on only one side. The reflectivity
of bright aluminium foil is 88% while dull embossed foil is about 80%.
Aluminium is used for packaging as it is highly malleable: 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
Aluminium foil is widely sold into the consumer
market, often in rolls of width and several metres in length. Examples of products
It is used for wrapping food in order to preserve it, for example, when storing leftover food in a refrigerator
(where it serves the additional purpose of preventing odour exchange), when taking sandwich
es on a journey, when baking, or when selling some kinds of take-away
or fast food
restaurants in the United States
, for example, typically provide take-away burrito
s wrapped in aluminium foil.
Aluminium foil is widely used for radiation shield (barrier and reflectivity), heat exchangers ( heat conduction
) and cable liners (barrier and electrical conductivity
). Aluminium foil's heat conductive qualities make it a common accessory in hookah
smoking: a sheet of perforated aluminium foil is frequently placed between the coal and the tobacco, allowing the tobacco to be heated without coming into direct contact with the burning coal.
The shielding effectiveness
of aluminium foil depends upon the type of incident field (electric, magnetic, or plane wave), the thickness of the foil, and the frequency (which determines the skin depth
). Shielding effectiveness is usually broken down into a reflection loss (the energy bounces off the shield rather than penetrates it) and an absorption loss (the energy is dissipated within the shield).
Although aluminium is non-magnetic, it is a good conductor, so even a thin sheet reflects almost all of an incident electric wave. At frequencies more than 100 MHz, the electric field is attenuated by more than 80 decibel
s (dB) (less than 10−8 = 0.00000001 of the power gets through).. graphs reflection loss for copper, and shows electric field and plane wave losses at greater than 90 dB.
Thin sheets of aluminium are not very effective at attenuating low-frequency magnetic fields. The shielding effectiveness is dependent upon the skin depth. A field travelling through one skin depth will lose about 63 per cent of its energy (it is attenuated to 1/e = 1/2.718... of its original energy). Thin shields also have internal reflections that reduce the shielding effectiveness. For effective shielding from a magnetic field, the shield should be several skin depths thick. Aluminium foil is about ; a thickness of (ten times thicker) offers less than 1 dB of shielding at 1 kHz, about 8 dB at 10 kHz, and about 25 dB at 100 kHz.
Aluminium foil is also used for barbecuing
delicate foods, such as mushrooms and vegetables. Using this method, sometimes called a hobo pack
, food is wrapped in foil, then placed on the grill, preventing loss of moisture that may result in a less appealing texture.
As is the case with all metallic items, aluminium foil reacts to being placed in a microwave oven
. This is because of the electromagnetic field
s of the microwaves inducing electric currents in the foil and high potentials
at the sharp points of the foil sheet; if the potential is sufficiently high, it will cause electric arc
ing to areas with lower potential, even to the air surrounding the sheet. Modern microwave ovens have been designed to prevent damage to the cavity magnetron
tube from microwave energy reflection, and aluminium packages designed for microwave heating are available.Huss, G. (1997) Microwaveable Packaging and Dual-Ovenable Materials in The Wiley Encyclopedia of Packaging Technology, 2nd ed., edited by Brody, A. and Marsch, K. New York, John Wiley and Sons
Art and decoration
Heavier foils made of aluminium are used for art, decoration, and crafts, especially in bright metallic colours. Metallic aluminium, normally silvery in colour, can be made to take on other colours through anodisation
. Anodising creates an oxide layer on the aluminium surface that can accept coloured dyes or metallic salts, depending on the process used. In this way, aluminium is used to create an inexpensive gold foil that actually contains no gold, and many other bright metallic colours. These foils are sometimes used in distinctive packaging.
Foil is used by organic/petroleum geochemists for protecting rock samples taken from the fields and in the labs where the sample is subject to biomarker
analysis. While plastic or cloth bags are normally used for a geological sampling exercise, cloth bags are permeable and may allow organic solvents or oils (such as oils imparted from the skin) to taint the sample, and traces of the plastics from plastic bags may also taint the sample. Foil provides a seal to the ingress of organic solvents and does not taint the sample. Foil is also used extensively in geochemical laboratories to provide a barrier for the geochemist, and for sample storage.
The material used in many ribbon microphone
s is aluminium leaf, or "imitation silver leaf", as it is sometimes called. This is pure aluminium and is around 0.6 to 2.0 micrometres thick. It is virtually the same material that the BBC used on Coles ribbon
s, with the exception that they also hand beat the leaf even thinner. They did this by sandwiching the ribbon between toilet paper and beating with a ball-peen hammer
. This "cold forges" the leaf. The aluminium leaf was then annealed for an hour in an oven to restore flexibility. Corrugations must also be imparted into the ribbon: Coles used 25 per inch (1 mm cycle). RCA 44BX has 19 corrugations per inch (0.7 mm cycle) and is around long; RCA 77 has 13 corrugations per inch (0.5 mm cycle). RCA ribbon material is around 1 to 1.5 micrometres (0.00005 inch) thick. The new Nady ribbon plus AEA both state that they use 2 micrometre aluminium ribbon in their microphones.
Some aluminium foil products can be recycled
at around 5% of the original energy
cost, although many aluminium laminates are not recycled due to difficulties in separating the components and low yield of aluminium metal.