Do You Know The Misunderstanding Of Purchasing A Vacuum Flask?

People should pay attention to practicality when choosing a vacuum flask and avoid the following two misunderstandings: First, the vacuum flask is not as expensive as possible. The manufacturing process of the vacuum flask is not complicated, and the principle of heat preservation is basically the same. The difference may lie in the choice of materials, so It is not that the more expensive and the larger the brand, the better the insulation effect of the vacuum flask. The second is that the heavier the thermos cup is, the better. Some unscrupulous manufacturers will add sand and other things between the cup body and the inner liner to increase the weight. Although such thermos cups are heavy, their insulation effect is not good. There is no basis for the argument that the heavier the thermos cup, the better the insulation effect.