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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 are the functions of vacuum bag and aluminum foil bag?
Aluminum foil bag usually refers to aluminum-plastic composite vacuum bag, suitable for moisture-proof and light-proof vacuum packaging of large-scale precise machinery and equipment, chemical raw materials and pharmaceutical intermediates. With four-layer structure, it is characterized by good water-proofness and oxygen isolation. Aluminum foil bag can be made into flat pocket style, three-dimensional bags, organ bags, etc, according to the requirements of customers. The test results of GB and ASTM show that the product complies with environmental requirements (a third party testing report available if required) and the environmental standard of EU and North America in which packing material is most strictly required.
Q:What's the characteristics of aluminum shielded twisted-pair?
There are four types of twisted-pair cable shielding: 1. Wrapping four pairs of wires only with aluminum foil; 2. Wrapping each pair of wires with aluminum foil and no metal net outside the four pairs. Since there is only one layer of shielding in outer sheath, it is called single shielded twisted-pair cable. 3. Wrapping four pairs of wires with aluminum foil and meal net; 4. Wrapping each pair of wires with aluminum foil and then add a metal net outside the four pairs. Since each wire has a layer of shielding and there is one layer of shielding in outer sheath, it is called double shielded twisted-pair cable.
Q:How to produce aluminized paper?
Q:What's the aluminum foil?
As a kind of decoration, if you make handicraft by yourself, it can broaden ideas, for example, it can serve as filler right hardness when making cross-stitch card pocket. Besides, it can also be used as cooking material, for example, you can wrap the chicken wings with aluminum foil after dipping enough sauce, and then roast the wings after you make sure that the oven can heat metal material.
Q:Does some one has ever used the aluminium foil paper to keep the house roof from overheat? How about the effect of this method?
It has some effect, but not durable. The general effect can be better if you use the material like foam glass to keep heat insulation and preservation.
Q:How to remove the oxide layer in the aluminum foil with a chemical process?
Generally, we adopt the method of alkali corrosion to remove the oxide layer on the surface of the aluminum foil.The purpose of alkali corrosion is removing the oxide layer on the surface of the aluminum foil. (Note: Technological process of the method is as follows: under normal temperature, 20% nitric acid; the process parameters is about 0.5 minutes. Pre-degrease--degrease--rinsing--rinsing--alkali corrosion--rinsing--rinsing--bright dipping--rinsing--rinsing--pure rinsing. The purpose of bright dipping is to remove surface residual black ash after alkali corrosion.Temperature:50-60 degrees; time:0.5-1 minutes.The purpose of degreasing is to remove grease on the surface of the aluminum foil.The process parameters is 0.5-1 minutes. You can use acid to wash it.
Q:Can aluminum foil insulate heat?
Second, the aluminum foil as an industrial manufacturing raw materials, products are mainly used in protective packaging, supplies, construction and the like. Aluminum foil and aluminum foil aluminum foil backing adhesive wall paper made of paper. Soft and easy modifications, such as paper, and do not rebound after deformation.
Q:What's the use of aluminum tape?
It is used for fire resistance. Aluminum tape is made by pasting aluminum foil, glass fiber cloth and silicone paper with acrylate adhesive by using unique techniques. It is often used in thermal insulating and fire resistant surface of HAVC air-line system, sealing the puncture of bar for line and damage repairing of fire resistant aluminum foil glass fiber surface and thermal insulation of automobiles, train carriage and ship pipelines.
Q:Is the aluminium air duct poisonous?
There is no rubber and plasticization. The aluminium paper is poisonousless even burned in the high temperature environment. And it can be used as the package of food.
Q:How to wash away the oil of aluminum foil products after being pressed?
I suggest that you can use the volatile punching oil since it won't be rudimental.

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