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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, it is used broadly in food and pharmaceutical packaging. The purpose of aluminium is to make long-life packs (aseptic processing|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.

Aluminium foil is widely sold into the consumer market, often in rolls of 500 mm (20 in) width and several metres in length.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 sandwiches on a journey, or when selling some kinds of take-away or fast food. Tex-Mex restaurants in the United States, for example, typically provide take-away burritos wrapped in aluminium foil.

Aluminium foils thicker than 25 μm (1 mil) 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 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.The reflectivity of bright aluminium foil is 88% while dull embossed foil is about 80%.

Aluminium (or aluminum; see spelling differences) is a chemical element in the boron group with symbol Al and atomic number 13. It is a silvery white, soft, ductile metal. Aluminium is the third most abundant element (after oxygen and silicon), and the most abundant metal in the Earth's crust. It makes up about 8% by weight of the Earth's solid surface. Aluminium metal is so chemically reactive that native specimens are rare and limited to extreme reducing environments. Instead, it is found combined in over 270 different minerals.The chief ore of aluminium is bauxite.

Aluminium is remarkable for the metal's low density and for its ability to resist corrosion due to the phenomenon of passivation. Structural components made from aluminium and its alloys are vital to the aerospace industry and are important in other areas of transportation and structural materials. The most useful compounds of aluminium, at least on a weight basis, are the oxides and sulfates.

Despite its prevalence in the environment, no known form of life uses aluminium salts metabolically. In keeping with its pervasiveness, aluminium is well tolerated by plants and animals. Owing to their prevalence, potential beneficial (or otherwise) biological roles of aluminium compounds are of continuing interest.

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Q:What is aluminum foil tape?
Electromagnetic interference shielding, not only for electronic signal transmission played a very good effect, but also isolate the harm of electromagnetic waves on human health. Like with the ordinary clear plastic, foil tape encountered the same high or low temperature will become deformed soft stick could not become something, so people invented a low temperature aluminum foil tape.
Q:What are the advantages and disadvantages of aluminum foil packaging?
Excellent barrier properties , moisture-proof, airtight, Paul Hong, the contents of the package to prevent moisture absorption, oxidation and volatilization deterioration of its moisture barrier, oxygen barrier properties. Easy processing of aluminum foil, plastic film and paper can be complexed with.
Q:What’s the use of aluminum foil glass wool felt ?
It can also be used in such industries as central air conditioning, architecture, chemical engineering, light textile, metallurgy, ship, auto mobile and appliance to absorb noise and resist heat. Aluminum foil glass cotton serves to preserve heat, prevent moisture and radiation. It is also nice-looking.
Q:What's the specification of aluminum tape?
Aluminum foil tape can work with all the seams of the aluminum foil composite material, the seal of puncturing spot of bar for line and repair of breakage. It is the main material of refrigerators and freezers factory, and also the must-purchasing raw materials of heat preservation material distribution department. Products are widely used in refrigerators, air conditioning, automobile, petrochemical, bridge, hotel, electronics and other industries. The product description of aluminum tape. Its purity is higher than 99.95% to eliminate electromagnetic interference (EMI), prevent electromagnetic wave from harming human body and avoid the voltage and current to influence function. In addition, electrostatic discharge after the ground has a good effect. Material is polyester fiber, which is not easy to appear cracks and be damaged in the repeated usage or bendings. It has pasting ability, good conductivity and can easily fit in the wire winding and also can be cut according to customer requirements into specifications.
Q:What is the value of scrap aluminum recycling?
Waste aluminum foil wide range of sources, mainly from cigarettes, food and pharmaceutical packaging, the main ingredient is aluminum, with high economic and social value of recycling. The experimental study, the use of waste aluminum foil PAC optimal conditions and scope, has a certain practical significance in improving resource utilization, environmental protection and other aspects.
Q:Does the tin foil paper or aluminum foil paper can protect people from radiation?
I want to tell you that the radiation can not be isolated. it only can be reduced.the radiation you said is computer radiation. can you really buy a thick concret wall in front of you? it may have an impact on your phone signal and net can use a method of refracting-type at 45 degree to reduce radiation(like a fighter to avoid rader radiation.)more
Q:Why some board mounted pills are covered with a layer of aluminum foil?
Tropical aluminum structure is NY25 / Alu60 / VC, super good barrier properties, but can also punched out in the above pattern, further play publicity. However, once this package apart, tropical aluminum barrier function is not, so to finish as soon as possible.
Q:What kind of material does aluminum foil paper belong to?
Aluminum foil paper belongs to metal mixed material like alumina, which is a raw and auxiliary material for industry manufacture and mainly used for preventing package, articles for daily use and building.
Q:Is aluminum foil a kind of alloy or something else?
Aluminum foil is pure aluminum, (except for the fake) which is a kind of thermoprinting material made by calendaring aluminum into sheet. Since its thermoprinting effect is similar to that of silver foil, it is also called fake silver foil. As aluminum is soft and ductile with silvery luster, aluminum foil sheet can be made by mounting calendered aluminum sheet on the offset paper with sodium silicate, which can be used to print. But the color of aluminum foil will gradually become dark as it is easy to be oxidized and it fade due to friction and touching, so it is not applicable to the thermoprint of book covers for permanent preservation.
Q:What are the advantages of decorative aluminum foil?
Decorated by aluminum foil - plastic composite decorative material in the form of application, the use of aluminum foil good color, high reflectance properties of light and heat. Mainly used in construction, furniture and decorative part of gift box.

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