When 67-year-old Uncle Wang went out to buy vegetables, he participated in roadside promotion activities. Holding the thermos cup sent by the event lottery, Uncle Wang went home happily.
After returning home, the family carefully looked at this free thermos cup and found that the cup body was not clearly marked, and there was a slight peculiar smell, so they did not let Uncle Wang use it to make tea and drink, and let him use the old glass at home.
Uncle Wang was a little unhappy, and his family had to persuade him: "CCTV has exposed that many thermos cups are unqualified, and the heavy metals in them exceed the standard." Pouring boiling water into this kind of cup is not only poisoning but also carcinous, will I still harm you?"
Hearing what his family said, Uncle Wang was a little dazed, and felt that the free thermos cup in his hand was actually a little hot.
With the wrong water cup, hot water in, poisonous water out?
It turned out that CCTV exposed a batch of deadly thermos cups, and after sampling 50 brands of thermos cups, it was found that 19 brands of products had excessive heavy metal content!
Many people were a little worried when they saw this news. Some people also say that the brewed tea scale will stick to the inner wall of the thermos cup, corrode the inner wall, and dissolve the heavy metals inside, which is harmful to the human body. So what are the facts?
Due to the strict regulations on the material of stainless steel edible materials in the national standard GB9684-2011, the dissolution amount of metal elements such as lead, cadmium and arsenic in stainless steel is strictly controlled. So as long as we choose qualified products from regular brands, there is no need to worry too much.
CCTV also did a special test to prove the safety of different thermos cups. The researchers selected 12 samples and tested them for heavy metals such as lead, arsenic, cadmium and chromium after 60 minutes of boiling water.
The results showed that the 12 samples did have trace amounts of heavy metal precipitation, but not to the extent of health impact.
Among the thermos cups, plastic cups, glasses, and enamel cups, the safest cup is...
Choosing the wrong cup of water can also be risky to drink water. Stainless steel cups, glasses, plastic cups, enamel cups and other materials are different, the advantages and disadvantages are different, which kind of cup is more suitable for drinking and healthier?
Stainless steel mug
Stainless steel material is resistant to high temperature, corrosion, and not easy to break, but be careful not to store carbonated drinks, coffee, juice, strong tea and other beverages for a long time. Because acidic substances can cause the dissolution of heavy metals in stainless steel. Long-term intake of heavy metals is harmful to our body.
glass
Glass products are very safe materials, most of the components are inorganic silicates that have been treated at high temperatures, have good chemical stability, are easy to clean, but easy to break. Be careful not to heat the water directly when using it for the first time, otherwise it is likely to burst, so you can add a little hot water to preheat it first.
Plastic cups
There are many kinds of plastics, and the average plastic product will be marked with a recycling label of 1 to 7, and these numbers come with safety tips.
No. 1 is made of PET. Represented players: mineral water bottles and beverage bottles. This type of material is not resistant to high temperatures, and harmful substances are easy to precipitate above 70°C. Therefore, it is best not to use it for more than 10 months.
No. 2 is made of HDPE, representing the contestants: plastic medicine bottles and outer packaging bottles of bath products. Because it is easy to retain detergent, there are many small gaps in the used plastic material, which is easy to breed bacteria. Therefore, it is not recommended to recycle food or use it as a drinking glass.
No. 3 is made of PVC. Representative contestants: raincoats, building materials, plastic boxes, and outer packaging of some disposable medical supplies. This kind of material is not resistant to high temperatures, grease, and is easy to precipitate harmful substances after contact with food and beverages.
No. 4 is LDPE material. Representative contestants: plastic wrap for plastic wrap and medical supplies. When exposed to a temperature of > 110°C, these materials will melt and decompose, precipitating harmful substances.
No. 5 is made of PP. It is a food-grade material, and it has heat resistance and corrosion resistance, and a melting point of up to 167 °C, so it is the only plastic that can be heated in a microwave oven.
No. 6 is PS material. Representative contestants: disposable water cups and lids, instant noodle boxes, fast food takeaway boxes. If this kind of material is heated in the microwave oven or contains substances with high pH content, it is easy to precipitate polystyrene, and it will become yellow and brittle after long-term use.
No. 7 is made of PC material. Representative players: water cups, baby bottles. It is the most recommended plastic cup material like No. 5.
Enamel cups
The older generation likes to use enamel jars. It is coated with a layer of ceramic glaze on the surface of the metal cup, and then calcined at a high temperature. In this way, the metal surface can be coated with a layer of porcelain to prevent rust.
But the problem is that the calcination temperature of this kind of cup is low, and the porcelain formed is not stable enough, so when it comes into contact with food (especially acidic food), some harmful metals will seep out. And the enamel cup is not dropped. When the porcelain on the surface is damaged, the heavy metals hidden under the porcelain are more likely to seep out.
Ceramic mugs
There are three types of such cups: uncolored glaze, underglaze and overglaze. The colorless glaze is mainly made of ceramics, and there are no harmful substances precipitated out, and it can be used to make tea. The practice of underglaze colored porcelain is to first coat the pigment, and then calcined at high temperature, and the pigment is under the glaze, so that it will not produce harmful substances when used to hold water and make tea. The underglaze color is to apply the paint directly to the surface of the pottery, which will produce harmful substances during use, so it is best not to come into contact with hot water, acid and alkaline liquids.
Teach you 5 tricks and pick out a qualified thermos cup
Now that the weather is cold, everyone uses thermos cups more. Teach everyone 5 tricks to pick out a safe thermos cup.
Take a look at the label: when choosing a thermos cup, pay attention to whether there is a material type on the outer packaging, material composition, manufacturer name/contact information/implementation standard.
Second, look at the material: the inner material of the thermos cup is best to choose the one that is clearly marked with 304 and 316, and if there is no obvious marking, you should pay more attention.
Three look at the appearance: the surface of the cup with good quality, the weld, the cup lid switch button, etc. should meet the requirements, and there is no cup cover mismatch.
Fourth, smell the smell: a good quality thermos cup does not smell any peculiar smell, or the smell is relatively light, and it is easy to diffuse. Don't choose the kind of thermos cup that has a clear smell as soon as you open the cup.
Fifth, look at heat preservation: After the cup is filled with boiling water, the higher the heat preservation temperature and the longer the heat preservation time, the better the quality of the cup.