Stainless steel thermos cups are mostly sealed and insulated. Due to the structure of tea itself, it will ferment under closed conditions, and the fermented tea will produce some substances harmful to human body. Tea is rich in protein, fat, sugar, vitamins, minerals and other nutrients. It is a natural health beverage, which contains tea polyphenols, caffeine, tannin, tea pigment and so on, and has many pharmacological effects.

Precautions for thermos cup

The thermal insulation performance of the thermos cup mainly refers to the inner container of the thermos cup. After filling with boiling water, tighten the bottle stopper or thermos cup cover clockwise. After about 2~3 minutes, touch the outer surface of the cup body and the lower part of the cup body with your hands. If you find a warm feeling, it means that the heat preservation performance is not good enough.

For stainless steel thermos cup, the quality of its material is very important. There are many specifications of stainless steel materials, among which 18/8 means that the composition of stainless steel materials contains 18% of chromium and 8% of nickel. Only materials that meet this standard are green products.