Stainless steel does contain chromium, and theoretically chromium may also migrate into water. However, there are national standards for stainless steel used in catering containers, which stipulate the migration amount under specific conditions.

The allowable amount of migration itself is far lower than the amount that may be harmful to health, and the food (such as tea) contained in reality is far milder than the "specific conditions" determined by national standards. In other words, even if there is chromium precipitation in reality, it is far from reaching the "harmful" amount.

Features of stainless steel thermos cup:

1, stainless steel thermos cup belongs to alloy metal products. According to different uses, it contains different trace metal elements. Common metal elements are chromium, nickel, silicon, carbon and aluminum. Iron is a trace element that the human body needs to ingest every day, but this element cannot be provided to us in a glass. Just as we usually need to choose an iron pot for cooking, the reason is the same.

2. The stainless steel thermos cup is mainly made of inner and outer double-layer stainless steel materials by vacuum pumping technology. Its vacuum structure can effectively control three heat transfer modes: heat conduction, heat convection and heat radiation, so as to achieve the purposes of heat preservation, cold preservation and freshness preservation.

Therefore, it has three functions of heat preservation, cold preservation and fresh preservation, and also has three advantages of health, fashion and environmental protection, which meets the requirements of current green and low-carbon economy, and conforms to people's consumption concept and fashion trend.

Extended data:

Not suitable for liquids in thermos cups.

1, acidic beverage. If the inner container of the thermos cup is high manganese and low nickel steel, it cannot be used to hold acidic drinks such as fruit juice or carbonated drinks. This material has poor corrosion resistance and is easy to precipitate heavy metals when it meets acid. Long-term release of acidic beverages may harm human health. In addition, fruit juice is not suitable for high temperature storage, so as not to destroy its nutrients; Moreover, drinks with high sweetness are easy to cause a large number of microorganisms to breed and deteriorate.

2. milk. Some people put hot milk in a thermos and carry it with them. However, the acidic substances contained in dairy products will react chemically with stainless steel, which is not conducive to human health. Microbes in milk will also accelerate reproduction at higher temperature, which will make milk rot and deteriorate, causing discomfort such as abdominal pain and diarrhea.

3. tea. Many middle-aged and elderly people like to fill a thermos cup with hot tea when they go out, and it won't be cold all day. However, if tea leaves are soaked in hot water for a long time, the nutrients contained will be destroyed, and tea leaves will no longer be mellow and become bitter.

4. Chinese medicine. Some people are used to frying Chinese medicine in the morning and drinking it in a thermos cup in the afternoon. However, the pH of traditional Chinese medicine is different, and it is also easy to corrode the stainless steel inner wall of the thermos cup, resulting in a chemical reaction, which will harm the body after drinking. Traditional Chinese medicine can be stored for a day or two at 25 degrees Celsius, but it can be stored at room temperature because it is easy to deteriorate at high temperature in a thermos cup.

People's Daily Online-Stainless steel cups are "toxic"? Misleading public conclusions

People's health network-four things in a thermos cup

Baidu encyclopedia-stainless steel thermos cup