The material of the vacuum flask is various. Many friends only pay attention to the brand of the vacuum flask when purchasing the vacuum flask. The material is not very well understood. Let's take a look at the characteristics of several common vacuum flasks.
1. Stainless steel vacuum flask
Stainless steel should have been food grade 304 stainless steel, which is clearly pointed out by relevant national standards. Because the iron contained in stainless steel is also a trace element that we need to ingest every day. It not only keeps warm but also keeps it cool, and it is also very convenient to use in daily life. However, stainless steel vacuum flasks should not be used for making tea and brewing coffee. Because the tea is soaked in the warm water in the thermos cup for a long time, like the mild omelet, the tea polyphenols, tannins and other substances contained in the tea will be leached in a large amount, and the tea is rich in color and has a bitter taste. Also, since the water in the vacuum flask will always maintain a high water temperature, the aromatic oil in the tea will quickly evaporate and also reduce the scent of the tea. The most serious point is that the vitamin C and other nutrients contained in the tea will be destroyed when the water temperature exceeds 80, and the health function of the tea should be lost.
2. Glass mug
Glass mug, healthy but not falling. The reason why the glass flask is safer is that since the glass is sintered by inorganic silicates, it is a very stable substance, and the bad impurities contained in the production process will not leak out. And the glass is easy to clean, so using a glass is the safest. However, glass tea has the disadvantage of being easily broken, so it is not convenient to carry it with you.
3. Purple sand mug
Zisha Insulation Cup not only has the basic functions of stainless steel vacuum flask, but also can make tea, which has the functions of health and conditioning. The purple sand insulation cup produced by the regular manufacturer, the inner liner is generally developed by the authentic pure natural purple sand mud (less production), and the outer casing is usually stainless steel material with anti-drop and anti-smashing. In addition, the hot and cold vibrating cup of Zisha Insulation Cup has strong adaptability. No matter whether it is cold winter or lunar summer, after injecting boiling water, it will not cause cracking due to rapid temperature change, and the sand cup has slow heat transfer and is not hot.
4. Ceramic mug
Ceramic vacuum flasks are not many in the vacuum flask industry. Ceramic cups are completely harmless. It will not be like metal cups and plastic cups. If used for a long time, there will be potential for ingesting metals and other materials.
5. Plastic mug
Usually, plastic cups on the market can only have the function of heat insulation. The function of heat preservation can only be 2 to 3 hours at most, and the lower the room temperature, the faster the heat loss. Plastic vacuum flasks can also be insulated, but the insulation time of plastic cups is far from the insulation effect of stainless steel and ceramic mugs, which is not suitable for autumn and winter seasons. According to experts, long-term use of plastic cups has the potential to cause cancer.
