What Is A Vacuum Flask

vacuum flask

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In recent years, as people’s health consciousness continues to improve, the vacuum flask has become no longer just a water utensil but a contemporary health care standard. Therefore, choosing a good insulated water bottle is crucial. So, what are the considerations for choosing a thermos? What details do you need to look at when choosing an insulated cup? Next, Everichhydro will briefly share some tips for selecting a vacuum flask.

Definition of Vacuum Flask

A vacuum flask is generally made of ceramic or stainless steel, with a vacuum layer made of water containers. The top has a lid that is sealed tightly, and a vacuum and adiabatic layer can be installed in the interior of the water and other liquids to slow down the dissipation of heat and achieve the purpose of heat preservation. The principle of heat preservation: there are three ways of heat propagation: radiation, convection, and conduction. Vacuum flasks within the silver cup gallbladder can reflect the radiation of hot water; the cup gallbladder and the vacuum of the cup body can block the transmission of heat; and not being able to pass heat to the bottle can prevent heat convection!

Functions of Vacuum Flask

A thermal vacuum flask is glossy and odorless, and after injecting boiling water, the flask with no heat sensation in hand can be called a good water bottle. The internal and external parts are stainless steel, refined with advanced vacuum technology, elegant shape, seamless liner, good sealing performance, and good thermal insulation performance. You can add ice cubes or hot drinks. At the same time, functional innovation and detailed design also give the new vacuum flask more connotation and practicality. Functional diversity, or “a cup of multi-purpose,” has become a popular practice in the new vacuum flask. Every vacuum flask has its distinctive features, some are double-cover designs, drive as long as you press the middle of the red key, the water will automatically flow out and will not splash wet in the car; some in the middle of the vacuum flask design have a tea segregation design, tea and tea can be quickly filtered, applicable to the office of the small white-collar workers; there is also a double-cup design, the bottom of the box cover and the tea, sugar, and coffee, such as the dark frame And the use of stainless steel double-layer production of the vacuum liner not only can hold water but also can hold ice water, etc., some cups also have a simmering function; the function of the least insulation cup also has at least 2 or more functions; and the most multi-functional vacuum flask with 4 to 5 kinds of functions, whether it is for traveling or home use, is very convenient.

How to Choose the Best Vacuum Flask

First, look at the body of the vacuum flask.
In our daily lives, we may wish to carefully identify its body when selecting vacuum flasks. For good vacuum flasks, not only are the production requirements very strict, but the level of craftsmanship requirements is also high. Therefore, the body of this vacuum flask is usually smooth and thick, while in a poor-quality vacuum flask, the cup wall is thin and the surface is rough, so the feel is very poor. At the same time, we can also observe to see whether the mouth of the vacuum flask is smooth, whether there is no weld on the wide-mouth water bottle, etc.

Secondly, look at the vacuum flask material.
Vacuum flasks are generally made of stainless steel with a vacuum layer. On the market, there are many kinds of stainless steel, such as 201 stainless steel, 202 stainless steel, 304 stainless steel, 316 stainless steel, and so on. Among them, 304 stainless steel and 316 stainless steel are common materials for insulation cups in life. Therefore, when picking a thermos, look carefully at the inner bottom of the thermos; if there is a steel seal of 304 or 316, it is qualified. However, there are still subtle differences between the two. Compared to 304 stainless steel and 316 stainless steel, due to the addition of chromium, nickel, manganese, and other metal elements with different content, its heat resistance and corrosion resistance are better. Even in very harsh conditions, a 316 stainless steel vacuum flask can be used freely. In addition, if you often use vacuum flasks to brew milk tea, coffee, and other drinks, it is recommended that you choose a 316 stainless steel vacuum flask. It is worth mentioning that the price of a 316 stainless steel vacuum flask will also be higher than the price of a 304 stainless steel vacuum flask. Relevant research data show that long-term use of low-quality stainless steel to do the inner liner of the vacuum flask will cause pharyngitis, respiratory infections, mucous membrane damage, or even affect liver and kidney function. Therefore, the purchase of vacuum flasks is recommended to the formal channels; do not endanger their health for the sake of small profits.

Thirdly, look at the performance of the vacuum flask.
The selection of vacuum flasks not only looks at the style and color but is also focused on durability, which depends on their thermal insulation performance. The reason why vacuum flask heat preservation occurs lies in the vacuum flask liner and the cup body between the vacuum, resulting in the formation of a non-conductive heat vacuum layer so that the water contained in the internal delayed heat dissipation can be preserved. Of course, looking at the appearance of the vacuum flask, one certainly cannot tell the specific insulation time. You may wish to fill the vacuum flask and tighten the boiling water, and after a few minutes, touch the cup and the bottom of the cup if there is a warm feeling, which is enough to show that the performance of this vacuum flask is not very good. A good vacuum flask, such as our Everichhydro insulated water bottle, uses laminated vacuum temperature locking technology, long-lasting temperature locking, and thermal insulation to keep cold for up to 12 hours.

Fourth, smell the vacuum flask.
In the selection of a vacuum flask, we may wish to open the lid of the vacuum flask to smell the smell. Qualified vacuum flask, its silicone gasket, sealing leakage with food-grade materials, basically no taste. On the contrary, if the material is not qualified, it will emit a pungent smell.


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