Thermos cup is a commonly used household item in daily life, with it, you can drink warm water anytime and anywhere, no longer need to repeat the boiling water, but some black-hearted businesses in order to save costs, the production of thermos cups has become a "poison cup", the scourge of the people
In order to understand the quality and safety of the thermos cup, the host arranged for the experimenters to buy a batch of common children's thermos cups on the market and use them to make tea, and then seal and store the tea.
What is extremely shocking is that only about three days later, the inner wall of the thermos cup immediately corroded, and the tea inside always emitted a bad smell.
Further chemical element testing found that these thermos cup liners are actually made of cheap 201 stainless steel, you must know that the national requirements of the thermos cup stainless steel is at least 304, unqualified thermos cup materials will cause heavy metal content in the drink to exceed the standard, causing some health problems.
The researchers explained to everyone that the general qualified thermos cup liner is made of food-grade 304 and 316 stainless steel, of which 316 stainless steel is the highest quality, you know, nickel, chromium and manganese in stainless steel are the most indispensable metal elements, once these metal elements exceed, it will have a huge impact on human health.
First of all, manganese exceeded. The state stipulates that the content of manganese must be less than 2%, if we have a long-term unclear intake of manganese, it will reduce the body's immunity, show symptoms of loss of appetite, and directly increase the risk of cancer and Parkinson's disease.
In particular, children who use thermos cups with excessive manganese will have a decline in intelligence after a period of time.
This is because manganese is a heavy metal, after the human body ingests too much, it can enter the brain through blood circulation, too much manganese can easily cause negative effects on the nervous system, especially the synaptic function of neurons in the brain, which is very likely to disrupt neurotransmission and interfere with normal cognitive function and Xi function.
Excess manganese produces oxidative stress in the human body, and then releases a large number of free radicals that destroy the normal structure and function of human cells. At the same time, excess manganese may trigger an inflammatory response, leading to neuronal damage and death. These inflammatory responses and oxidative stress can cause irreversible damage to brain development and function.
The second is chromium exceedance. The chromium content should be less than 18%. If chromium is exceeded, it will directly affect our respiratory tract, thereby causing rhinitis, laryngitis, pharyngitis, etc., this is because chromium is irritating, when chromium exceeds the standard into the respiratory tract, it can directly stimulate the mucosa of the respiratory tract, causing inflammatory reactions and tissue damage. Symptoms include nasal congestion, cough, and sore throat.
Chromium ions are oxidizing and can react with oxygen molecules or other oxidizing agents in living organisms to form highly reactive free radicals. These free radicals trigger an oxidative stress response, leading to oxidative damage to cells and tissues. In the respiratory tract, this oxidative action can lead to damage to mucosal cells and an inflammatory response, which in turn can lead to respiratory diseases.
Finally, nickel exceededs.
The nickel content should be between 8% and 12%. If the nickel content is exceeded, it can cause neurasthenia, reduce fertility, and nickel also has a risk of fetal teratogenicity and cancer.
For children who are not yet fully developed, drinking water with excessive heavy metal content for a long time is simply chronic poisoning, and carelessness may lead to the death of children.
So is it completely safe to use a thermos cup that meets national standards?
If used improperly will also cause the problem of excessive metal, scientists once bought eight different brands of thermos cups to prepare for experiments, after pouring acidic solution into the thermos cup, eight thermos cups immediately appeared manganese exceedance, the highest even exceeded 34 times.
Scientists explain that the acidic solution will accelerate the displacement of heavy metals in the thermos cup, which will seriously lead to excessive heavy metals.
Therefore, do not store acidic substances in the thermos cup to avoid adverse reactions.
The working principle of thermos cup insulation
The invention of the thermos cup is very big, and it is a good thing to ensure the needs of people and warm water, but do you understand how it works?
First, the double-layer structure.
The thermos cup usually adopts a double-layer structure, forming a vacuum layer between the inner and outer layers, so that the conduction of heat through the air is almost blocked. This prevents heat from being transferred from the internal liquid to the external environment by conduction, or vice versa.
Second, the insulation layer material.
Thermos cups often use materials with good thermal insulation properties, such as stainless steel or plastic. These materials have a low thermal conductivity, which reduces heat transfer.
Third, tightness.
Thermos cups usually have a good seal to prevent heat from being transferred from the surface of the liquid to the outside environment by means of evaporation or convection. Rubber gaskets or other sealing materials are often used to achieve the sealing effect.
Fourth, the reflection of thermal radiation.
The inner wall of the thermos cup is usually made of materials with radiation-reflecting properties, such as silver plating or vacuum coating. These materials reflect the heat radiation emitted from the liquid inside, reducing heat loss.
Therefore, the better the material, the higher the thermal insulation effect, of course, the higher the price, so it is whimsical to want to buy a good thermos cup at a low price.
When buying a thermos mug, don't buy it if it has the following characteristics, it is toxic
It is precisely because the issue of safety is particularly important, so when buying a thermos cup, we must pay attention to some of its characteristics, and the doctor teaches you how to choose a thermos cup that looks safe to escort everyone's health.
First, open it and smell it.
After the toxic thermos cup is opened, it will obviously emit a strong pungent odor, which comes from the cup or seal made of materials containing toxic chemicals used by the manufacturer, and this smell cannot be washed off, which is a very inferior thing.
Second, the coating that is easy to peel.
Toxic mugs may have coatings or inner wall treatments, but these coatings may peel off, peel off, or wear out. Peeling coatings can release harmful substances into the liquid.
Third, check whether there are any non-conforming certifications or marks.
Toxic thermos cups may not have passed the relevant quality certification standards, such as food safety certification, national standards, etc., and the lack of relevant certification marks on the outer packaging or the bottom of the cup may also be a warning sign, which is often said to be a three-no product, if it is a three-no product you still have to buy, that is your problem.
Fourth, low-cost or low-quality materials.
Toxic thermos mugs are often sold at very low prices, but are made using inferior or defective materials that may contain harmful metals or additives.
Fifth, the sealing is very poor.
Generally speaking, most of the thermos cups that meet the national standards are large factories, and they must ensure the sealing and heat preservation of the thermos cup when making the thermos cup, so the sealing of the thermos cup will definitely be better, if you find that the sealing of a thermos cup is very poor, then it is mostly a fake and shoddy product, do not buy.
In summary, to buy a thermos cup, you must look for a good brand, a big brand, relatively speaking, the bigger the brand, the better, the safety is relatively high, and then look at the composition of the thermos cup, to meet the national standards, but also to take into account the price of the thermos cup, too cheap thermos cup cost must be very low, the material used will not be very good.
For everyone's safety, children's safety, we must pay attention to the selection and purchase of thermos cups, buy a good benefit a lot, buy fake and shoddy will cause irreversible damage to the human body, and a word of advice to everyone, don't be greedy for cheap, sometimes greedy for cheap will make people regret for life.
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