1. Stainless steel thermos cup
Stainless steel thermos is a common type of thermos on the market. The cost and price of this thermos are not high, but the heat preservation effect is good and has a high cost performance. The stainless steel liner used in the stainless steel vacuum flask should be made of food-grade 304 stainless steel, otherwise the stainless steel vacuum flask will not meet the standard. There is also iron in the inner liner of the stainless steel thermos cup, which is one of the elements we need to ingest every day. However, the stainless steel thermos also has certain defects, that is, it is not suitable for making tea and coffee, because when tea or coffee is soaked in water for a long time, the tea polyphenols, tannins and other substances contained in tea and coffee will be leached from the water. , affecting the use of thermos cups.
2. Glass thermos cup
Glass thermos is also a more common type of thermos. Compared with other materials, the glass vacuum flask is safer, because the glass liner of the glass vacuum flask is sintered from inorganic silicates, and the physical and chemical properties of this substance are relatively stable. It is not easy to produce bad impurities during use, and it will not affect the health of the human body, and the double-layer glass teacup has better thermal insulation. But the glass thermos also has a big disadvantage that it is fragile. Glass is fragile, and it is easy to break if you need to carry it with you for a long time, or when you go out and use it.
3. Purple sand thermos cup
The purple sand thermos cup is one of the less common of all thermos cups. The kitchen and household products thermos cup made of purple sand not only has the function of heat preservation, but also has the functions of health preservation and conditioning. The inner liner of the purple sand thermos cup is generally made of pure natural purple sand mud, and the outer shell is generally made of stainless steel that is resistant to falling. The purple sand thermos has many advantages, such as strong adaptability to hot and cold, healthy and durable, and not hot to the hand. However, because the purple sand inner liner is more expensive, the cost of the purple sand thermos is also relatively high.
4. Ceramic thermos cup
Ceramic thermos cups are now very rare on the market. Ceramic is a completely harmless material, so many kitchen utensils such as ceramic kitchen utensils use this material. Generally speaking, metal thermos cups and plastic thermos cups have some hidden safety hazards, and long-term use may lead to the risk of ingesting bad metal substances. The ceramic vacuum cup is completely harmless and suitable for long-term use. However, ceramic vacuum flasks also have several disadvantages. First, ceramics are fragile items and are not suitable for the elderly and children. Generally, ceramic vacuum flasks do not have airtightness, so they are not suitable for outdoor use. At the same time, the thermal insulation performance of ceramic vacuum flasks is relatively poor compared to stainless steel and glass vacuum flasks.
