It was possible to improve the consumer qualities of the inner surface of aluminum utensils using non-stick coatings. The most common non-stick fluoropolymer coatings (incorrectly called Teflon in everyday life) have been used for more than 50 years..
Non-stick coatings on cookware, how good non-stick coatings look, arrangement of the bottom of a cookware with non-stick coating, durability of non-stick coatings, is it true that on a non-stick coating you can cook without oil.
Dishes with non-stick coating can be aluminum (stamped or cast) or steel, enameled on the outside. Moreover, aluminum does not exhibit undesirable properties here, since it is coated with a strong inert layer of fluoropolymer.
This interesting polymer is a surprisingly inert material. It does not react with oxidizing agents, alkalis, acids, organic solvents. Consequently, it does not react chemically with any food, water or household detergents..
Another useful property of this material is that it has a smooth and slippery surface that is practically free of friction; nothing sticks to its surface. When in the 50s of the 20th century they tried to make non-stick coatings for pans out of it, this ware quickly conquered the whole world.
The leader in the global market for cookware with non-stick coating for many years is the brand Tefal. Now on the market there are also brands of cookware with fluoropolymer non-stick coating: Hostaflon, Hest, Scapen, Stainmaster, Akzonobel, Stalaflon, Adgelast and others.
Despite the many years of popularity of non-stick cookware, manufacturers do not cease to improve their products. Polyceramic non-stick coatings are also used. In this case, the polymer penetrates into the pores of the ceramic coating, forming a fairly hard layer. Such dishes are better resistant to damage and scratches. But its price is higher.
How good non-stick coatings look on dishes?
Internal fluoropolymer non-stick coatings on dishes can be smooth or cellular, like bee honeycombs. Cells or other bottom structure increase the heating surface and make it more uniform. Do not be embarrassed if such a coating is rough, nothing sticks to it. If particles of solid minerals or metals are added to non-stick coatings, they will become much more durable. Such non-stick coatings resemble wet sand on the beach..
To improve the quality and strength of non-stick coatings, they are now made multilayer. For example, a 4-layer Tefal coating consists of a top layer with perfect non-stick properties for long-term use. Below is a unique layer that resists scratches and destructive effects of abrasive substances..
The next layer serves to firmly adhere the coating to the substrate. And finally, under it is a sublayer based on a unique polymer to protect aluminum from deformation. This multi-layer coating adheres firmly to the aluminum base..
And in 2005, Tefal invented the new Expert non-stick coatings. They consist of five layers, which provide increased scratch resistance and allow the use of not only plastic, but also metal accessories (spatulas, spoons and so on).
About the device of the bottom of the dishes with non-stick coating.
Inexpensive frying pans and stewpan with non-stick coating are made of fairly thin metal. But the thin bottom from heating can warp. It’s bad if, after warming up, pour cold water into the pan or just pour several eggs from the refrigerator at once. Draw conclusions – do not pursue cheapness.
Using such dishes, from time to time it will not hurt to make sure that the bottom is completely flat outside. This is easy to verify by attaching a ruler to the bottom. This is especially important for electric stoves, where the burners are perfectly flat. A small deflection of the bottom of the dishes will result in a noticeable amount for an excessive use of energy. Not to mention the fact that dishes will take longer to cook in such dishes.
To prevent deformation of the bottom, they are either more massive than the walls or are equipped with anti-deformation discs made of stainless steel. As an external coating, high-strength enamel, varnish, stainless steel are used. Frying pans with non-stick fluoropolymer coating are available for all types of modern stoves – from gas to glass-ceramic. And now there are models for particularly demanding induction hobs.
Heat-resistant removable handles allow you to use this cookware in hot ovens. Now look at the bottom outside. If it is completely covered with tiny concentric grooves like an old gramophone record, this cookware is ideal for a gas stove. Grooves increase the heating area, less fire is needed, and dishes cook faster.
Only in vain are the grooves silver. Because of this, part of the heat is reflected without benefit, and the grooves themselves are difficult to clean from soot. Physicists would be asked, and they would advise to bring the resemblance to the record to the end. Make the bottom black. This improves the heat absorption from the burner, and the appearance of the bottom would not cause concern for the hostesses.
On the durability of non-stick coatings on dishes.
No matter how good the fluoropolymer coating would be said, it is still not metal, it is a much softer material. Through an accidental scratch on it, the grease, alkalis and acids contained in the products penetrate the metal base, and peeling of the coating begins. Dishes with a thin bottom of 2-2.5 millimeters are especially vulnerable. Over time, its coating loses its non-stick properties as a result of local overheating, which cannot be avoided with a thin day.
The service life of more massive cast pans, on which non-stick coatings are applied, is also affected by careless handling, leading to a significant reduction in their operating time. If non-stick coatings are damaged, it remains to be hoped that there is a safe material under them that is approved for contact with food. You can be sure of this if you buy dishes from well-known manufacturers that have received a certificate of conformity for their goods.
It’s hard to say how things are with cheap products from unknown companies. Manufacturers establish a full-service life for thin cheap pans 2-4 years. Frying pans with a more durable cellular coating serve 5-6 years. The most durable are cast pans with a bottom thickness of at least 6 mm, variable-section walls of 3.5 mm thickness and a hardened rough coating or a new multilayer. They are able to serve up to 10 years..
Is it true that non-stick cooking can be done without oil?
Without oil, frying on a non-stick coating is possible, but not necessary. And the dishes are more boring, and the pan will not last as long as it could. Another thing is that less oil is needed. The advertisement says that in dishes with non-stick coating the dishes are tastier. Let everyone check this for himself..
But that they look more beautiful, rouge, appetizing is a fact. In pots with fluoropolymer coating it is better to cook borscht, jelly, stew vegetables, boil milk in an aluminum or enamelled one..