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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:Why is the aluminum foil in the lithium ion battery eroded ?
High voltage (above 5V) might cause erosion of aluminum foil, but it is impossible for lithium ion battery whose voltage ceiling is 5V. In fact, the erosion is caused by HF produced by the electrolyte decomposition, especially when the water in the battery is not enough. While charging, capacitance works as electrolytic tank and aluminum as the negative pole. As the electrons flows through external circuit, aluminum will not react with the electrolyte (aluminum loses electrons)
Q:What's the highest temperature resistance of the aluminum foil ?
Yes.
Q:Does the aluminum foil bag prevent x-ray
The aluminum foil bag can prevent the X-ray.The common indusrial (LED,mask packaging,audio card,food packaging,ect.,the kinds of aluminum foil bag have the function of anti-static and radiation.The common aluminum bag can't prevent the static and radiation,only the special aluminum foil bag can prevent the X-ray)doesn't have such function.The common aluminum bag and PCB board,like the package of tea leaves,can't prevent static and radiation. there are many kinds of aluminum bag.
Q:Why aluminum foil should be used in capacitor material of distributors?
The normal metal capacitor, especially CBB21/,DV/, impulse current of its turn-off voltage is very high. The capacitor material of distributors, if the distributors of ignitor can't bear such high impulse current. Using CBB28 or CBB8,in which the capacitor can bear a higher impulse current.The ratio of DT is higher.
Q:What color coated aluminum coil is?
Polyester coated aluminum coil Is a UV protection coating, polyester resin is the use of the polymer main chain containing an ester bond in the monomer, adding alkyd resin, an ultraviolet absorber can be divided into matte and glossy series based on gloss. Especially for interior decoration and advertising boards.
Q:Is aluminum tape toxic?
Aluminum tape is non-toxic. However, if the oxidation film on the surface of aluminum foil is damaged, aluminum element may deposit in the body and affect people's health. But it is not poisoned. Aluminum tape is widely used in refrigerator, air conditioning, automobile, petrochemical, bridge, hotels and so on. It uses quality pressure-sensitive adhesives (PSAs) and has various characteristics such as good stickiness, aging resistance.
Q:How to prevent foil wrinkling?
Since the rolling Aluminum often bear greater than after the order processing tension, some rolling showed only bad plate-shaped cut in the use of aluminum foil or annealed Shique showed wrinkling. The main reason is due to wrinkling produce bad shape control, including roll grinding incorrect, unreasonable control roll, rolling and cutting process parameters is unreasonable, incoming bad flatness and flatness adjustment is not correct, set or lack of precision cylindrical die.
Q:How many years does aluminium foil heat-insulating film can be used?
The aluminizing heat-insulating film can be used 3 to 5 years and pure aluminium can be used 6 to 10 years.
Q:Are high-temperature aluminum foil?
Are high temperature aluminum foil, aluminum foil, also known as aluminum foil, tin foil in Hong Kong was also called, is the thickness of the processed sheet with aluminum foil rolling mill in a 0.2mm or less, mainly used in the kitchen cooking, food use or it can be used to make some simple cleaning materials. Thousands of tons of aluminum foil around the world as a protective and packaging of food, cosmetics and chemicals.
Q:Who knows the price of 3m conductive aluminum foil tape?

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