This is harmless to the human body. It stores heat by absorbing heat, cools boiled water and releases heat to heat cold boiled water. There is no chemical reaction and no harm in this process, but at present, 55-degree cups are generally not optimistic, and many of them use water to conduct heat, and those materials he said are not used. But there is no harm, and this aspect is still safe.

Principle: There is actually an interlayer in the middle of the 55-degree cup, and the phase change material in the interlayer can absorb heat. This phase change material is a solid with a phase change temperature of 55℃. When people pour boiling hot water into a cup and shake it for at least one minute, the phase change material in the cup quickly absorbs heat and becomes liquid, and the water temperature in the cup drops sharply, thus realizing the cooling function. Phase change materials can store temperatures. When cold water is poured in, the heat of the phase change material is absorbed and changed back to solid state, and the water temperature will rise, which is actually a very simple physical change.

Beijing Fifty-five Degrees Technology Co., Ltd. applied for a patent for this cup. The staff of the company said that the inner wall filler of this rapid temperature-changing thermos cup is a phase change metal mixed with nanoparticles. Professor Feng Yimin from the Department of Chemistry of Weifang University said that the substance mixed with nanoparticles does not exist, because it is mixed with other impurities, so it cannot be called nano-substance.

In addition, nanoscale metals are very expensive and scarce, so they are generally used for research and investigation, and are unlikely to be used to make cups. Even if other kinds of phase change metals are used, the amount of phase change metals will not be too high from the price of cups.