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Unlike flat sheets, a coil is a coiled piece of aluminum material. The core is a hollow cylinder on which the coiled material is wound, thereby forming the interior diameter of the coil itself.Depending on the application, aluminum coil stock for sale can be divided into aluminum fin stock, polysurlyn laminated aluminum coil,aluminum coil with kraft paper, aluminum trim coil,etc. Although the aluminum coil stock has rich types and grades, the most popular ones are the following aluminum coils:Aluminum Fin StockAluminum Fin Stock is light-weight, formable and corrosion-resistant material, which is used in various objects such as car radiators and heat shields. It can also be used in a wide variety of Heating, Ventilation, and Air Conditioning (HVAC) items such as aluminum radiators, aluminum evaporators, and aluminum condenser.Aluminum Coil with Kraft PaperAluminum plain jacketing roll with moisture barrier is mainly used for anticorrosion and insulation projects. It is exported to hundreds of countries, especially the pipeline insulation projects in Middle Eastern oil countries.Why is there a layer of kraft paper on the surface of the aluminum coil? The anticorrosive performance of the aluminum coil itself is superior, and the service life of the aluminum coil is greatly enhanced after being laminated with a layer of kraft paper. It also has a certain adsorption effect on the moisture inside the pipeline.Polysurlyn Laminated Aluminum CoilPolysurlyn laminated aluminum coil is a multilayer composite film made of polyethylene and sarin polymer, with a film thickness of about 7 microns. It is firmly covered on the surface of aluminum coil plate by high temperature and high pressure.Aluminum Coil with Polysurlyn Moisture Barrier has excellent adhesion, very good air tightness, and excellent corrosion resistance, which is an ideal material for pipeline anti-corrosion protection.