In China, almost everyone has a thermos cup, and office workers and student parties will prepare one. Even if it is not for health, in order to have hot water to drink at any time, the thermos cup will become your first choice. However, have you ever paid attention to the selection of thermos cups? It may only be selected by face value or price, but I don't know that these thermos cups sold in the market are not as good-looking as they look.
Some thermos cups may even become "killing cups", which may pose a potential safety hazard for your health. Therefore, you must learn to distinguish inferior thermos cups, so as to prevent the hot water you drink from becoming "poisonous water".
Why can a thermos cup become a "death cup"?
As the name implies, the thermos cup plays the role of heat preservation, so the inner container of the thermos cup is mostly made of stainless steel. If it is a qualified thermos cup, we can use it for several years, but there are always disharmonious factors. Some unscrupulous merchants blindly pursue profits, and in order to reduce costs, they do not hesitate to use some scrap metal processed products to make thermos cups.
When you pour boiling water into a thermos cup made of this material, the inner container of the thermos cup will release harmful substances under the action of high temperature. These harmful substances will dissolve into water and eventually be drunk into your body. Drinking this toxic water for a long time is self-evident. It will not only do some harm to the digestive system and respiratory system, but also affect cardiovascular health and brain memory, and really become a "death cup" around you.
So how to distinguish inferior thermos cups?
1, smell it
Qualified thermos cup liner has no peculiar smell. If it is a thermos cup with poor inner liner, it will smell choking. And the thermos you bought. If you find that there is an odor in the tea after using it to make tea, then this thermos cup is also unqualified. It is recommended not to use it again.
2, look at the material and label
The thermos cup marked with "304" indicates that it is qualified stainless steel, or marked with 18/8, all of which meet the national food-grade standards. The inner container of the thermos cup can prevent rust and corrosion, and will not cause harm to human body. If there is no thermos cup with this label, it is recommended not to buy it, which is not only easy to rust, but also harmful to human body.
3. Observe the sealing performance
Pour hot water into the thermos cup, screw on the lid and let it stand for a few minutes, then touch the cup wall with your hand. If the cup is hot, it means that the heat preservation performance is not good. Then shake the thermos cup a few times to see if there is any water leakage. If there is water leakage, it means that the thermos cup is not well sealed.
4. Learn to distinguish the plastic parts on the thermos cup
If the insulation is made of food-grade plastic fittings, it has no peculiar smell and looks bright, and there is no burr on the surface of the contact fittings. This kind of fittings is not easy to age and is harmless to human body. If it is inferior plastic parts, it smells bad, has many burrs and is easy to age. Even if the inner container is qualified, if the accessories are not in kind, the service life of the thermos cup will not only be short, but also affect the quality of drinking water.
After we know this knowledge, it won't be too difficult to choose a thermos. It is best to go to a regular business to buy it.
Choose a regular brand. Generally, the quality of such products is guaranteed. As long as we keep our eyes open, we can avoid being cheated and buying inferior thermos cups.