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Aluminium alloys with a wide range of properties are used in engineering structures. Alloy systems are classified by a number system (ANSI) or by names indicating their main alloying constituents (DIN and ISO).

The strength and durability of aluminium alloys vary widely, not only as a result of the components of the specific alloy, but also as a result of heat treatments and manufacturing processes. A lack of knowledge of these aspects has from time to time led to improperly designed structures and gained aluminium a bad reputation.

One important structural limitation of aluminium alloys is their fatigue strength. Unlike steels, aluminium alloys have no well-defined fatigue limit, meaning that fatigue failure eventually occurs, under even very small cyclic loadings. This implies that engineers must assess these loads and design for a fixed life rather than an infinite life.

Another important property of aluminium alloys is their sensitivity to heat. Workshop procedures involving heating are complicated by the fact that aluminium, unlike steel, melts without first glowing red. Forming operations where a blow torch is used therefore require some expertise, since no visual signs reveal how close the material is to melting. Aluminium alloys, like all structural alloys, also are subject to internal stresses following heating operations such as welding and casting. The problem with aluminium alloys in this regard is their low melting point, which make them more susceptible to distortions from thermally induced stress relief. Controlled stress relief can be done during manufacturing by heat-treating the parts in an oven, followed by gradual cooling—in effect annealing the stresses.

The low melting point of aluminium alloys has not precluded their use in rocketry; even for use in constructing combustion chambers where gases can reach 3500 K. The Agena upper stage engine used a regeneratively cooled aluminium design for some parts of the nozzle, including the thermally critical throat region.

Another alloy of some value is aluminium bronze (Cu-Al alloy).



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.

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Q:How does aluminum foil bag should be heat-sealed?
If you don't vacuumize bags,heat-sealing machine is ok. Some heat-sealing machines have hand grips, some are pedaled or with belt wheels. Prices vary with different manufacturers. If you want to vacuumize bags, a vacuum machine is ok. After the vacuumizing process, the vacuum machine is directly sealed.
Q:does aluminum sheet need to conduct ROHS detection?it's metel material, how much detections should it conduct for ROHS detection?
It's ok for detecting four items of ROHS heavy metal for ROHS detection of metal material.
Q:what will happen when aluminum sheet is put into copper chloride solution?
the chemical equation of the reaction, 2Al+3CuCl2=2AlCl3+3Cu, the phenomena when aluminum sheet is put into copper chloride solution: there is red solid generating on the surface of aluminum sheet.
Q:The thickness of aluminum foil.
The purity of aluminum foil and the pure aluminum are higher than the lithium battery. the material of thickness of 0.1mm is called foil,and now the thickness of aluminum foil is 0.01mm.
Q:What's the difference between aluminum laminated films and aluminum foil film?
Aluminum laminated film is thin film like PP and PET steamed by vacuum and then coated with aluminum. Aluminum foil film is a film that is compounded by aluminum foil and plastic film. The alumimum coated layer is very thin with the thickness of 300-400 angstrom while the thickness of aluminum foil is about 0.01mm.
Q:Which sides do we use when conducting the electricity.
Aluminum foil is a kind of metal paper with silver white package. it is called tin paper in Hongkong and it is a kind of pressed metal aluminum.It can be used in kitchen for cooking and the simple material.
Q:can use aluminum foil to shield the loudspeaker box wire?
Aluminum foil paper is not easy for grounding. If you can connect the aluminum foil with the pre-stage ground wire of power amplifier and connect well, it surely can help.
Q:Why are the aluminum coils sticky after annealing?
There is oil or the annealing time is too long!
Q:What is the common color of aluminum coil membrane?
The blue transparent membrane is the most common.
Q:How much fluorocarbon and polyester paint should be used in production of aluminum coil and aluminum-plastic panel?
In theory, one kilogram paint can spray 6 square kilometers for your required thickness. Then you can calculate the total areas.

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