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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:Copper foil, aluminum foil laser cutting, what type of laser, how much power?
Do not have too much power absorption rate high is the keyA laser with a wavelength of about 1064 (the shorter the wavelength the better, but the shorter wavelength) would be too expensiveThe power 300W is enough
Q:Can foil paper be used in a microwave oven with barbecue? Thirty
Microwaves do not penetrate metals, so do not use aluminum foil unless you use the light wave baking function alone.Microwaves produce electric currents in metals, creating arcs at the tips and sparks. Not dangerous.
Q:What are the advantages of a decorative foil?
Rapid spread from urban centers in Shanghai, Beijing, Guangzhou and other parts of the country, high-quality decorative foil as a high performance electronic shielding materials and building decoration materials, due to light pollution and overcome the security issues of the glass curtain wall, more and more building decoration industry favor in recent years, a sharp increase in demand, as is generally the inner wall of the building and interior furniture decoration materials, facade and interior decoration business organizations are also widely used.
Q:Best mold material for aluminum?
I'm considering on doing the same to make various motorcycle parts. Did some research and noticed there are several brands of specialty plasters designed for use as reusable metal casting molds. I'll be using one of those when the time comes to avoid wasting time and material.
Q:What's the difference between the cold stamping molding aluminum foil and common aluminum foil package
The technological process is determined by the type of metal, size,quality requirement,production and the producing equipment size,production capability.the characteristics of medical aluminum foil are as follow:1.the machinery character can meet the requirement of the use. Its softness makes it easy to process.2. the light weight is helpful to reduce the cost of the transportation.
Q:Find a weld and riveting machine to connect the two roll of aluminum together. the width of aluminum is 40-60cm,because the surface of aluminum has a layer of oxidation film,so...
I am a high voltage professional welder. I can't endure the current surge,even the spot welding. the surface oxidation film can be baked by the cutting knife,or polish by the abrader. no matter how big the welding rod is useless.The aluminum is too thin.
Q:Does the aluminum has good thermal insulation
The theory of aluminium foil thermal insulation is reflecting the light. I suggest that you can use the professional thermal insulation and temperature preservation material(phenolic foam board,rock wool,EPSXPS.ect.) and choose the right material according to the requirements.
Q:Aluminium Pressure Cookers?
The choice between an aluminum and stainless steel can be boiled down to two important factors - price and durability. Aluminum ones are cheaper but they are better conductors of heat. However, they are inferior when it comes to design and quality. Stainless steel pressure cooker maybe more expensive but it is more durable and reliable. Stainless steel pressure resists corrosion; it’s scratch and warp resistant so you can keep it shiny and pretty for a long time. It does not react to food.
Q:What the food grade aluminum-foil paper concretely mean?
Aluminum-foil paper used in barbecue is namely aluminum foil. It can not only be used in barbecue, but also can be used to hold food in service plate. Some jerky's vacuum package is also aluminum foil.
Q:How to classify the ground heating foil?Which expert points down?
By thicknessAccording to the difference between the thickness of aluminum foil can be divided into thick foil, single zero foil and double zero foil. The thick foil: thickness of 0.1 ~ 0.2mm. The single foil foil: zero thickness is 0.01mm and less than 0.1mm / foil. The double zero foil: the so-called double zero foil is in its thickness to mm as the unit of measure is two zeros after the decimal point of the foil, usually less than 0.0075mm thick aluminum foil. English thick foil expression, called "heav y gaugefoil'", a single aluminum foil zero is called "medium gaugefoil", "lightgaugefoil'" double zero foil. Foreign sometimes less than 40ltm thickness of aluminum foil is called light gauge foil, and the thickness of aluminum foil >40btm referred to as heavy gaugefoil.

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