With the coming of winter and the promotion of health awareness, more and more people carry thermos cups on the street. Whether it is the small staff at work or the first-line stars, it is a common phenomenon to carry thermos cups out! However, it is widely spread on the Internet that “thermos cup can not be tea, coffee, juice, milk, otherwise it will make the stainless steel wall of the thermos cup acid corrosion, resulting in the release of heavy metals, affecting human health”, causing panic on the Internet. Small edition clearly tell you that the thermos cup tea will not harm the body, please see the following scientific proof:
Vacuum + corrosion resistant stainless steel prevent heavy metal release
To the netizen put forward the thermos cup tea harmful to the body of the argument is not scientific, we might as well take a look at the main components of the thermos cup. Generally speaking, regular thermos cup basically is by stainless steel material inside and outside wall, add the structure that double layer draws vacuum, ability develops its due heat preservation function truly. And austenitic stainless steel contains chromium, when chromium in contact with air, oxygen in the environment, it will form a special layer of chromium oxide film, to prevent corrosion, the possibility of heavy metal release.
Tea and coffee should not be put into the thermos cup, otherwise the heavy metal substances in the thermos cup will be released.
In the brewing process of tea and coffee, tannin will be released gradually with the extension of the brewing time, and then affect the flavor. But tannins’ influence only ends there. In fact, tannins, which belong to polyphenols and have the word “acid” in their name, are in fact nitrogenous alkaline substances with significant physiological effects in plant tissues, rather than the acidic components that are known to have corrosive effects. Therefore, nature can not lead to corrosion of stainless steel, let alone good quality and surface without wear of stainless steel corrosion resistance is quite high, if not a high concentration of strong acid, otherwise it can not lead to deterioration. In fact, the public should be concerned about whether there are excessive pesticide application and heavy metal residue in the soil during the tea growing process.
The above is the correct statement that “is tea made in thermos cup harmful to the body?”, but also hope that consumers can establish a correct and scientific point of view, do not take it for granted that erroneous information causes adverse effects.
