Aluminium
Aluminium is a lightweight metal which exhibits very good thermal conductivity. The main characteristics of aluminium are that it does not rust, and is resistant to many forms of corrosion. Being a soft metal, it is commonly alloyed with magnesium, copper, or bronze to increase its strength. It is generally available in sheet, cast or anodized forms. Sheet aluminum which is spun or stamped into form is commonly used for making baking sheets, pie plate, cake pans, steamers, pasta pots, skillets etc. Cast aluminium produces a thicker product than sheet aluminium and is suitable for saucepots, dutch ovens, heavyweight baking pans etc. However, due to the microscopic pores caused by the casting process, cast aluminium possesses low thermal conductivity than sheet aluminium. Anodized aluminium, on the other hand, has the naturally occurring layer of aluminium oxide thickened by an electrolytic process to create a surface that is hard and non-reactive.
Copper
Copper is a metal which has the unique characteristic of providing good thermal conductivity, besides ensuring even heating. Due to these advantages, copper cookware has found a prominant place in Western cooking. The best copper cookware were made out of a thick layer of copper to ensure good thermal conductivity and a thin layer of tin to prevent the metal from reacting with acidic foods. However they tend to be heavy, expensive and requires occasional retinning. Copper cookware are now available with stainless steel rather than tin linings which last much longer. They are best suited for high-heat, fast-cooking techniques.
Cast Iron
Cast iron cookware is slow to heat, but once heated, provides even heating. It is cost effective and can withstand very high temperatures. Being a reactive material, cast iron is known to react with high acid foods. Cast iron, being a porous material, requires seasoning before use. Though cast iron cookware can be washed with soap, it should not be soaked in water or left wet for long.
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Stainless Steel
Stainless steel is an alloy of iron containing a minimum of 11.5 % chromium. It is resistant to corrosion and does not react with either alkaline or acidic foods. Stainless steel cookware though are light, cannot be easily scratched or dented. Though stainless steel finds general acceptance in cookware industry, its main drawback is its relatively poor heat conductivity. To overcome this, stainless steel cookware is generally made with a metal insert of copper or aluminium at the base.
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