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Why does the vacuum water flask make rattling noises?
Under normal circumstances, there will be no abnormal noise in the vacuum water flask. When you shake the vacuum water flask, you can hear some slight metal collision sounds, indicating that this vacuum water flask may have a quality problem.
You may be wondering, isn’t the vacuum water flask made of double-layer stainless steel? Between these two layers of stainless steel is a vacuum layer without air. Why is there any abnormal noise when nothing is put into the inner tank of the vacuum water flask?
Reason 1 for the abnormal sound of the vacuum water flask: the getter falls off
In order to keep the vacuum layer free of air between the inner liner and the outer shell of the vacuum water flask, getter materials are widely used in the vacuum water flask manufacturing industry. The getter is capable of adsorbing all reactive gases, such as oxygen, water, carbon monoxide, carbon dioxide, and nitrogen, through chemical reactions under vacuum conditions.
The getter looks like a shirt button and is spot-welded to the inside of the bottom of the vacuum water flask shell. After long-term use of the vacuum water flask or during a drop, it is very likely that the getter will fall off due to the vibration of the vacuum water flask body. At this time, the getter will collide with the inner wall of the vacuum water flask, making an abnormal noise.
Fortunately, although the fall off of the getter will cause the abnormal sound of the vacuum water flask, it has no effect on the overall use effect of the vacuum water flask, and will not reduce the thermal insulation performance of the vacuum water flask. You can use it with confidence. Of course, if you are uncomfortable with this abnormal sound, you can also give up using it and buy a new one, because the abnormal sound problem cannot be fixed.
Reason 2 for the abnormal noise of the vacuum water flask: the sealant of the vacuum hole falls off
We know that the vacuum layer between the inner liner and the outer shell of the vacuum water flask is achieved by high-temperature vacuuming. So the bottom of the vacuum water flask (not the bottom shell) will have a small void for drawing out the air. When the air is completely evacuated, a special sealant is needed to block the extraction hole to prevent the outside air from entering the vacuum layer of the vacuum water flask again. Sealant is a sticky substance that adheres to the extraction hole after curing.
However, with the long-term use of the thermos or the vibration generated by the cup falling to the ground, the sealant will shatter and fall off. The debris of these sealants will collide with the stainless steel inner wall of the vacuum water flask, causing abnormal noises. Unlike the getter, the peeling of the sealant often means that the vacuum water flask has lost its insulation effect, and you have to buy a new vacuum water flask.
All in all, the abnormal noise of the vacuum water flask indicates that your vacuum water flask has a quality problem. In order to avoid further harm, it is recommended to discard the vacuum water flask with abnormal noise. If you don’t know how to choose a good vacuum water flask, please click this article—《What is a good insulated water bottle》 to check it out. We are a factory with 20 years of professional vacuum mug manufacturing experience. If you are interested in our vacuum water flask products and OEM customized services, please contact our senior engineers and we will answer your questions as soon as possible.
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