In today's era of vigorously advocating healthy drinking water, thermos cups have become more and more people's first choice cups. However, due to the wide variety of materials, types, and brands of vacuum flasks, many people do not know which one is better when buying vacuum flasks. Which kind of vacuum flask is good? The following is some knowledge about the inner material of the thermos.
There are not many ceramic liners in the vacuum flask industry. Due to the problem of glaze color and coloring process, ceramics have the risk of excessive precipitation of heavy metals such as lead and chromium, which can cause harm to the human body. Moreover, ceramics are fragile, heavy, not portable, and have a relatively short heat preservation time. So it was basically eliminated.
The most popular material for the vacuum flask is stainless steel. The stainless steel vacuum flask has two layers of stainless steel for the outer shell and the inner liner. The two layers are insulated by vacuum technology, which can keep heat and cold. When purchasing a stainless steel vacuum flask, the main consideration is the material of the cup body and the sealing performance of the lid.
At present, 304 steel is the best material for the cup body on the market. Using food grade 304 stainless steel, it is safe and harmless within the scope of the national standard. Because the iron element contained in stainless steel is also a trace element that we people need to ingest every day.
The quality of the lid and rubber ring determines the sealing performance of the thermos cup. High-quality vacuum flasks often use PC, PP material inner lids and silicone rubber rings to ensure that the lid is flat, odorless and not easily deformed. If you buy a ss vacuum flask, these material parameters must be clearly seen.
In order to save costs, some businesses will choose poor quality stainless steel, and some will use high-manganese and low-nickel steel for the inner liner. The quality of the inner liner is difficult to distinguish with the naked eye, but if the inferior inner liner is used for a long time, the heavy metals such as chromium, nickel, manganese and so on are easily transferred to the tea water, which will affect the digestive system, respiratory system, cardiovascular system and memory of the human body. Cause damage. Therefore, when buying stainless steel vacuum flasks, you must look for products of big brands and good reputations, so as not to buy inferior vacuum flasks and harm your health.
Double glazed cups are the most common daily necessities in our lives. The glass liner is healthy but not fall-proof. The reason why the glass liner is safer is that the glass is sintered from inorganic silicates, which is a very stable substance. Moreover, glass cups do not contain organic chemicals during firing, and the glass surface is smooth and easy to clean. Bacteria and dirt are not easy to breed on the cup wall, so it is safest to use glass bulbs.
However, glass has the disadvantage of being easily broken, so it is inconvenient to use and carry around. It is only suitable for home use.
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