1. Stainless steel thermos cup
Stainless steel should be food grade 304 stainless steel, which is also clearly pointed out in relevant national standards. Because the iron element contained in stainless steel is also a trace element that we all need to ingest every day. It can not only keep warm, but also keep cold, and it is also very convenient to use in daily life.
However, stainless steel thermos cups are not suitable for making tea and coffee. Because the tea leaves are soaked in warm water in a thermos cup for a long time, just like a mild fried egg, the tea polyphenols, tannins and other substances contained in the tea leaves will be leached out in large quantities. In addition, because the water in the thermos cup will always maintain a high water temperature, the aromatic oil in the tea will volatilize quickly, which also reduces the fragrance of the tea. The most serious point is that nutrients such as vitamin C contained in tea will be destroyed when the water temperature exceeds 80 ℃, and the health care function of tea will be lost.
In addition, because stainless steel is a metal composite, the substances contained are relatively active substances, and some impurities will inevitably appear in the production process, and these impurities will be harmful to the human body to some extent. In addition, there will inevitably be some inferior stainless steel thermos cups on the market at present, and such thermos cups cannot be guaranteed to be equally safe.
2. Glass thermos cup
Glass thermos cup, healthy but not drop-proof. The reason why the glass vacuum flask is safer is that the glass is sintered from inorganic silicates, which is a very stable substance, that is, the bad impurities contained in the production process will not leak out. And the glass is easy to clean, so it is the safest to use the glass. However, glass tea has the disadvantage of being easily broken, so it is not convenient to use it with you.
3. Purple sand thermos cup
The purple sand thermos cup not only has the basic functions of the stainless steel thermos cup, but also can make tea, which has the functions of health preservation and conditioning. The inner liner of the purple sand thermos produced by regular manufacturers is generally made of authentic pure natural purple sand mud (less production), and the outer shell is usually made of stainless steel that is anti-fall and anti-knock. In addition, the purple sand vacuum flask has strong adaptability to the rapid changes in cold and heat. Whether it is cold in winter or in the hot summer, after boiling water is injected, it will not crack due to the rapid temperature change, and the sandy vacuum flask is slow in heat transfer and not hot.
4. Ceramic thermos cup
There are not many ceramic thermos cups in the thermos cup industry. Ceramic cups are completely harmless. They will not be like metal cups and plastic cups. Long-term use will have the possibility of ingesting metals and other substances.