Many people like it in life
Drink hot and lukewarm water
Carry a thermos mug with you
You can drink warm water at any time
or other beverages
It's convenient
However, some drinks should not be used for a long time
Serve in a thermos cup
Failure to do so may result in loss of nutrients and poor taste
It may also make you "tummy"
(Click on the picture below to watch the detailed report↓↓↓)
Besides
There are thousands of thermos cups on the market
If you accidentally buy it
Poor quality thermos mugs
It can also pose a health hazard
Here's what to look out for
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What kind of thermos cup can't be used?
Most of the thermos cups are made of stainless steel, which is resistant to high temperature and has good thermal insulation performance. Other materials such as glass, ceramics, purple sand, etc., are affected by factors such as heat preservation, drop resistance and price, and are only a small part of the "army of thermos cups".
At present, the vacuum cup appears on the market
There are many "codenames" for
Three types of stainless steel in 201, 304 and 316
201 stainless steel
Most of the unqualified thermos cups exposed in the news are made of 201 stainless steel as the inner tank of the thermos cup. Although the 201 stainless steel thermos mug is very cheap, it is not recommended to buy it. Because 201 stainless steel is not a food-grade material, it belongs to industrial supplies, and most of them are used to make decorative tubes, industrial pipes and straps.
201 stainless steel has a high manganese content and poor corrosion resistance, and if it is used as the inner liner of the thermos cup, long-term storage of acidic substances may lead to the precipitation of manganese elements. Manganese metal is an essential trace element for the human body, but excessive intake of manganese can harm the body, especially the nervous system.
304 stainless steel
Stainless steel is in contact with food, and its safety hazards are mainly the migration of heavy metals. Therefore, stainless steel materials that come into contact with food must be food grade. Food-grade stainless steel is most commonly used in 304 stainless steel, which has good corrosion resistance.
316 stainless steel
304 stainless steel is relatively acid-resistant, but it is still prone to pitting corrosion when encountering substances containing chloride ions, such as salt solutions. 316 stainless steel is an advanced version: it adds molybdenum to 304 stainless steel, which has better corrosion resistance. 316 stainless steel has a high cost and is mostly used in high-tech fields such as medical treatment and chemical industry.
Therefore, when we choose a thermos cup, it is recommended to choose stainless steel that meets safety standards and is marked with 304, 316 or "food contact", which is more secure in terms of safety and corrosion resistance.
Pick a thermos mug and remember 6 points
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1. Buy through regular channels and try to choose products from well-known brands. Consumers should pay attention to check whether the manual, label and product certificate are complete when purchasing, and avoid buying "three no products".
2. Check whether the product is marked with its material type and material composition, such as austenitic SUS304 stainless steel, SUS316 stainless steel or "stainless steel 06Cr19Ni10" and other words.
3. Open the thermos cup and smell it, if it is a qualified product, because the materials used are food grade, there will generally be no peculiar smell.
4. See if the surface is smooth. The inner liner, outer wall and mouth of a good thermos cup are smooth, without scratches and bumps, and there are no welds.
5. Accessories such as sealing rings and straws that are easy to contact with liquids should use food-grade silicone.
6. After purchasing, water leakage and thermal insulation performance tests should be carried out first, and the thermal insulation time should reach more than 6 hours.
Judge the thermal insulation performance of the cup: pour hot water into the cup, tighten the lid, and touch the cup with your hands after a few minutes, if there is no obvious feeling of heat, it means that the thermal insulation performance is good.
Test the tightness of the cup: Fill the cup with water, tighten the lid, place it horizontally and invert it for a moment to see if there is any water spillage, no spill indicates that the cup is well sealed.
Do you know the material of the thermos cup?
When choosing a thermos cup
Will you notice the 6 points mentioned above?
Welcome to communicate in the comment area~
Source: Health Times
Editor: Sheng Li (Xi)
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