Aluminum foil for some use

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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%.


We provide a full range of precision aluminum strip for almost any application. We produce aluminum strip in a wide variety of alloys, including clad composites. Our aluminum strip can be produced in standard dimensions or custom made to your special requirements. We produce both imperial and metric units. We manufacture in compliance with the main international specifications, and tighter tolerances or custom tempers are available upon request. We offer various surface conditions, custom finishes (painting, anodizing, embossing), special processing, and multiple packaging options to meet our customer's unique requirements. The following is a summary of our capabilities.

Manufactured in compliance with the main international specifications and standards, including:  Aluminum Association, ASTM, EN, and DIN.
We can also manufacture in compliance with other international standards including:ASME, SAE, AMS, AWS, FED, MIL, QQ, ISO, BS, AFNOR, JIS and GOST.

Manufactured in compliance with the main international specifications and standards.
Tighter tolerances are available upon request.


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:Is aluminium foil insulative?
No, aluminium foil is conductor.
Q:What's the aluminum foil?
To put it simply, it is ultra-thin aluminum sheet.
Q:The difference between pure aluminum foil bag and aluminized foil bag
if the two materials are shined under the light, the pure aluminum bag is transparent while the aluminized bag is silver white and the brightness of aluminum foil is weaker than the aluminized bag.when touching the two types of bag, the aluminum foil bag is a little hardness while the aluminized foil bag is soft and has the ductility.
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:What temperature needed to keep the aluminium foil spray lacquer having the adhesive force
To judge the adhesive force of oil paint of aluminium paper,we should heat the double paint formulations and the curing agent of the lacquer to 80 degree and 150 degree.
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:Is aluminum foil paper heat-proof?
No, it isn’t. Firstly, it is aluminum alloy which can conduct heat quickly. Aluminum foil used in micro-oven is to avoid overflow of food, which can resist high temperature but can’t insulate heat and on the contrary, it can conduct heat.
Q:Is aluminum foil pure aluminum?
No.
Q:The dark face of 8021 aluminum foil appears uneven rolling. What causes this and how to solve it?
The uneven rolling that you have mentioned is scratch or silvering. If it is scrath, this scrath may ba caused during the rolling process or the oil surface is scratched during the process of oil cleaning cut (finishing mill is single open book); Double open book in the process of finishing mill may also have a very small probability to cause rubbing scratch. If it is uneven rolling, it may be caused during the rolling process or the oil level exists silvering in the process of oiling(finishing mill is single open book). Seeing if it is cyclical since silvering is cyclical
Q:Does aluminum foil bag have property of X-ray proof?
Lead is the best material of property of X-ray proof.

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