For the manufacture of metal ware, including aluminum, used the so-called "Sheet" punching – in other words, it is several successive operations to the finished sheet metal or alloy, has a process known as stamping hood. Usually used bimetallic sheets of aluminum brand A7T1. Stamped ware is easy and convenient to use, saves in the process of cooking up to 30%, and a variety of different forms of stamps makes it easy to give a dish a modern stylish design. However, it is not too durable, but very low price conceals this defect. Learn more at this site: Dropbox. Also consider how long durability – another question. Several years of faithful service, subject to basic rules of operation you provided.
Of course, if you get a stamped bowl from a bona fide manufacturer, such as "REGENT INOX" … A more expensive but higher quality dishes made by chill casting (casting in sand form) – the highest quality and environmentally friendly. Casting – is the main method of production of the dishes from liquid metal alloys, especially for products rather complex configuration. And here are already used aluminum alloys AD1 marks, blood pressure, A7, A6. Cast cookware can be used for all types of plates, dishes such highly resistant to deformation. The first samples of cast aluminum cookware with non-stick coating and thicker down there in the middle of the twentieth century and quickly gained wide recognition among consumers. The thickness of the bottom in such utensils is 5-6 mm and 3-4 mm of the walls, which helps a more even distribution of heat and prolong the life of the coating.