Ella Walter
The production of pans involves various materials and processes, catering to different needs and preferences. Pans have been traditionally made from cast iron, carbon steel, or copper lined with tin, offering durability and even heat distribution. However, advancements in metallurgy have expanded the options to include stainless steel, aluminium, and ceramic. Stainless steel, known for its durability and low maintenance, is often bonded with aluminium or copper to enhance heat conduction. Aluminium, a lightweight and efficient heat conductor, is commonly used in professional kitchens, while ceramic pans provide a non-toxic and non-stick alternative. The choice of pan material depends on factors such as heat conduction, reactivity with food, durability, and ease of maintenance, all of which contribute to creating a safe and enjoyable cooking experience.
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What You'll Learn
Pans made from cast iron
Cast iron pans are made by melting down pig iron, scrap steel, recycled cast iron pans, and iron ore in a blast furnace. In the past, charcoal or coke was used to heat the furnace, but modern applications use electric induction furnaces or electric arc furnaces. The molten iron is then poured into a holding furnace or ladle, where various alloying elements are added to change its properties. For example, silicon forces carbon out of the solution, forming graphite and producing grey cast iron. Nickel is another common alloying element that refines the pearlite and graphite structures and improves toughness.
Once the molten iron reaches the right temperature, it is poured into a mould to give it its shape. Traditionally, these moulds were made of sand, water, and powdered clay, but modern moulds are made using automated machinery. Since sand melts at a higher temperature than iron, the mould holds its shape. After the cast iron has cooled, the mould is broken and the cookware is released. The sand is then shaken off, and fine steel is blasted to remove any remaining sand. The pans are then cleaned with water and soap and sent to be seasoned.
Seasoning is the process of creating a non-stick layer on the cookware. Pans are sprayed with vegetable oil or coated with paper towels soaked in cooking oil and baked at a high temperature, creating a natural, easy-release finish. After seasoning, the pans are inspected, packed, and sent to stores for selling.
Cast iron pans were first used during the Han Dynasty in China around 220 AD and became widespread in Europe by the 16th century. They were highly valued for their durability and ability to retain heat evenly, improving the quality of cooked meals. In the 19th and 20th centuries, cast-iron cookware was commonly used in households, especially in the United States. However, in the 1960s and 1970s, cast iron fell out of favour due to the introduction of Teflon-coated aluminium non-stick cookware. Recently, cast iron has seen a resurgence in popularity due to its health benefits and ability to withstand very high cooking temperatures.
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Pans lined with copper
Copper pans have been used since ancient times, dating back to Mesopotamia. Copper is the first metal that was worked by humans, with a history spanning about 11,000 years. Copper pans are highly thermally conductive, making them useful for even sautéing. However, copper is also highly reactive with most foods, especially acidic ones like vinegar and tomatoes. This reactivity can cause copper to leach into the food, which can be harmful if ingested over time.
To prevent this, copper pans are often lined with other metals. The most popular lining types include tin, stainless steel, nickel, and silver. Tin has been the traditional lining for copper cookware for many centuries. It is a pure, inert element that does not react with acidic or any other type of food. It also has non-stick properties, allowing for easy cooking without the need for seasoning. However, tin has a low melting point of around 450°F (230°C), which can be easily reached if a pan is left unattended over a flame. Therefore, tin-lined copper pans should not be preheated while empty and are not suitable for very high-heat searing. Tin is also relatively soft and can be damaged or worn away over time by metal utensils and abrasive scrubbing. With proper care, a tin lining can last for many years, but eventually, the pan will need to be re-tinned, which can be expensive.
Stainless steel is another popular lining for copper pans, providing superior heat conductivity and a sleek design. The combination of stainless steel and copper offers rapid heat distribution and precise temperature control, making it a favourite among home chefs. Nickel was used as a lining for copper cookware following the Second World War. It is harder and more thermally efficient than tin, with a higher melting point. However, it wore out quickly due to its irregular plating and sticky nature.
Overall, copper pans lined with various metals offer a combination of durability, design, and performance that appeals to culinary enthusiasts. The choice of lining depends on factors such as reactivity, non-stick properties, heat conductivity, and cost.
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$26.44
Pans with non-stick coatings
Non-stick pans are made by coating the pan's surface with a synthetic fluoropolymer called polytetrafluoroethylene (PTFE), which is often referred to by the brand name Teflon. The process of making non-stick pans typically involves the following steps:
Roughening the metallic substrate
The surface of the pan is roughened through abrasive blasting, which can be done by sandblasting the bare metal. This process creates an irregular surface that promotes better adhesion of the PTFE coating.
Applying a conductive metal layer
Sometimes, after roughening the surface, the pan is sprayed with another conductive metal layer, such as stainless steel, to further enhance the adhesion of the PTFE coating.
Spraying or rolling on the PTFE coating
One to seven layers of PTFE are then sprayed or rolled onto the prepared surface. The number and thickness of the layers, as well as the quality of the material, determine the overall quality of the non-stick coating. More layers generally result in a better non-stick coating.
Baking the pan
After the PTFE coating is applied, the pan is baked in a high-temperature oven. This step removes any remaining liquid and ensures that the PTFE coating adheres firmly to the metal pan.
Alternative non-stick coatings
While PTFE is the most common non-stick coating, there are other options available as well. Ceramic non-stick coatings, for example, are made by sandblasting a mixture of titanium and ceramic onto the pan's surface and then firing it at 2,000 °C. This type of coating contains no toxins and ensures a perfectly crispy layer on the food. However, ceramic coatings can lose their non-stick properties over time and may need to be replaced. Enamel coatings, which provide a durable and glossy finish, are another alternative, but they can crack if subjected to thermal shock or sudden temperature changes.
Concerns and considerations
Non-stick coatings, especially early versions of PTFE coatings, have faced concerns over the potential release of toxic gases if overheated. Perfluorooctanoic acid (PFOA), a component used in the early days of Teflon cookware, has been linked to various health conditions and is now being phased out. While modern PTFE coatings are generally safe for cooking, it is important to avoid overheating the pans beyond approximately 260°C to prevent the release of harmful substances. Additionally, non-stick pans require special care to extend their lifespan, such as using wood or silicone utensils and avoiding metal utensils that can damage the coating.
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Pans made from stainless steel
Stainless steel pans are an alloy of steel and chromium, with added nickel to increase durability and provide protection against corrosion. The chromium gives the steel its shiny, stainless look.
The production of stainless steel pans happens in four stages. Firstly, the layers of the pan are bonded together, then exposed to high heat and pressure until they fuse into a single sheet. The pan is then shaped, and the outer layer of steel is added.
Stainless steel is a popular choice for modern kitchens due to its durability, heat distribution, and heat retention. It is also non-reactive, meaning it won't discolour or add a metallic taste to acidic foods like tomato sauce. Stainless steel pans are also lighter than cast iron and more durable than non-stick pans.
One of the challenges of cooking with stainless steel is that food can stick to the surface. This can be prevented by preheating the pan, adding a thin layer of cooking oil, and only then increasing the heat. It is also important to ensure food isn't too cold when added to the pan, as this can cause sticking.
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Pans made from aluminium
Aluminium is a lightweight metal with very good thermal conductivity, making it a popular material for cookware. Pans made from aluminium are typically crafted from sheet aluminium, which is spun or stamped into form. This manufacturing process is simple and cheap, making stamped aluminium pans the most common type of aluminium pan. However, due to the softness of the metal, aluminium pans may be alloyed with magnesium, copper, or bronze to increase their strength.
Aluminium pans are also available in forged and cast varieties. Forged aluminium pans are made in a similar way to stamped pans, but with the addition of heat during the pressing process. Cast aluminium pans are formed by melting an aluminium alloy and pouring it into a mould. This process is more expensive than stamping, but produces better results in the kitchen. Cast aluminium pans are also thicker than sheet aluminium pans, and can be crafted with varying wall thicknesses to distribute heat more evenly.
Regardless of the type of aluminium pan, the metal is easy to recycle due to its low melting point. However, studies have shown that small particles of aluminium are released during cooking, which may be undesirable. To prevent this, aluminium pans are almost always coated with a non-stick material such as PTFE or ceramic.
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Frequently asked questions
Pans can be made from a variety of materials, including cast iron, carbon steel, copper, stainless steel, aluminium, ceramic, and Teflon.
Cast iron pans are very rigid and durable, but they are also heavy and take longer to heat up. They are also not ideal for cooking acidic foods, as the acidity may strip the seasoning coating.
Carbon steel pans are safe and healthy to cook with as no other materials are added. However, they rust easily if not stored in a dry place and are heavier than aluminium pans.
Copper pans have the highest thermal conductivity among non-noble metals, meaning they heat up quickly and distribute heat evenly. However, they are highly reactive with most foods, so copper pans are often sold with a tin lining which can be replaced when it wears out.
Non-stick pans have a coating that prevents food from sticking to the pan. They are usually made with PTFE (also known as Teflon) or ceramic. While non-stick pans are convenient and easy to clean, they can be dangerous if they overheat or if pieces of the coating come off.
