2. Health: Generally, 304 and 3 16 food-grade stainless steel are the most suitable liner materials for thermos cups at present. They have relatively good corrosion resistance and are not easy to precipitate heavy metals. However, for making tea, it is recommended to choose 3 16 food-grade stainless steel. At present, I use a teacup with strong light. Its shell is similar to a ceramic liner and is made of 3 16 stainless steel. Personally, it looks good, suitable for little girls, and it is also in line with food safety.
3. Insulation: The thermos cups on the market are mainly divided into the following materials: stainless steel, ceramics, purple sand, glass and plastic. Of course, the longest heat preservation time is stainless steel, and the effect of other materials is generally not as durable as stainless steel. The heat preservation time of the teacup I use now can reach 12 hours or more, which is very satisfactory for a healthy girl like me.
4. Making tea: The best way to make tea is to use preheated porcelain containers and hot water at room temperature of 90-95 degrees. If you sit in the office for a long time, you'd better make tea with ceramics or purple sand. But now many jobs need to go out to run business. If you want to drink tea conveniently, stainless steel thermos cups should be the first choice.