Stainless steel tableware can not hold salt, soy sauce, vinegar, vegetable soup for a long time. Prolonged exposure does produce chemical reactions that dissolve toxic metal elements and are harmful to health. Stainless steel tableware for daily life, the use of food-grade stainless steel, that is, in line with the \"stainless steel tableware container hygiene standards\" GB9684-88 provisions of stainless steel material, its lead chromium content is much lower than the general stainless steel, little damage to the human body.
On the contrary, the use of substandard or fake stainless steel tableware will damage human health.
Stainless steel is made of iron chromium alloy with chromium, nickel, aluminum and other trace metal elements. Chromium can make a dense passivation film on the surface of stainless steel, prevent the metal matrix from being destroyed, and maintain the stability of stainless steel.
However, salt and vinegar can destroy the passivation layer on the surface of stainless steel, dissolving the chromium element in it and forming toxic and carcinogenic metal compounds. The correct use and purchase of stainless steel tableware is particularly important.
First of all, on the logo of stainless steel tableware, look at the nickel and chromium content. Choose products with chromium content of 18 to 19 percent and nickel content of 8 to 9 percent.
If there is no sign, use a magnet test. It is certainly not good stainless steel that can be firmly absorbed, which proves that it contains less nickel, that is, poor corrosion resistance; On the contrary, the quality of the product that cannot be adsorbed is higher.
When testing, the most accurate way is to suck the bottom of the stainless steel container, because the edge of the container is sometimes magnetic because of polishing, and it will also suck when testing.
However, this method is not suitable for stainless steel products with added manganese.
Stainless steel cups can not be loaded with acidic and alkaline liquids, such as vinegar, hot and sour soup. Stainless steel contains heavy metals, acid and alkali substances are corrosive, installed acid and alkaline liquid, some heavy metals will dissolve out.
Stainless steel is often used to make corrosion-resistant items, but is not suitable for loading or storing strong acids, alkalis, or high-temperature liquids. In addition, stainless steel is not suitable for the loading or storage of flammable, explosive or toxic substances. In these cases, it may be safer and more appropriate to choose other materials.