1. Ear listening: Close your ears to the mouth of the bottle, and hearing a humming sound in the bottle means that the vacuum of the two layers of glass is good, and the heat preservation is good.
2. Visual inspection: Firstly, check whether the mouth of the bottle is round or not. If it is not round, it is easy to leak, and the heat preservation is not good.
How to choose a pneumatic thermos?
When purchasing a pneumatic thermos, in addition to the same thermal insulation effect and shell quality as a general thermos, you should also pay attention to the following three points:
1. Reliable pressure. It should be noted that the air pressure cover should not be skewed when it is pressed, it can only be vertically downward, and the pressing range should be large. If it is too small, it will affect the water output effect. If you press the water outlet with one hand and the top cover with the other hand, there should be no chronic air leakage at this time.
2. Reliable accessories. The water pipe is preferably made of stainless steel, and the sealing ring of the bottle mouth is made of silicone. Other materials are either not strong or hygienic.
3. The bottom rotating disk should be able to rotate 360 degrees, and it should be easy to rotate.
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