Drinking water is an important matter of survival and health, but if you use the wrong cup, it is equivalent to drinking poison，glass cookware!
Dare to tell Ah Zhuo, what cup do you use to drink water every day? Today we will reveal the secrets of various cups one by one!
Plastic cups - easy to hide dirt
Many people worry that plastic water cups will cause cancer. In fact, as long as you choose a brand that meets the national quality inspection standards, it is relatively safe.
Generally speaking, the bottom of the plastic cup is printed with numbers 1-7, the higher the number, the higher the quality. The most common ones are No. 5 pp (polypropylene) and No. 7 pc (polycarbonate).
The cup made of pp has good heat resistance, the melting point is as high as 167 ℃, and the chemical properties are relatively stable. It is the only plastic material that can be put into the microwave oven;
The pc material water cup cannot hold hot water and should not be exposed to sunlight, because high temperature may cause this material to release toxic bisphenol a.
In addition, although the surface of plastic cups seems smooth, there are actually many gaps, which are easy to hide dirt; and plastic cups are more likely to absorb dust and bacteria.
Ceramic cups - glazed ceramics are prone to exuding harmful substances
# porcelain cup #
With beautiful appearance and various patterns, enamel cups are very popular among young people, and there are more than one manpower. Ceramic mugs are divided into three categories:
①A ceramic cup with no color glaze and colorless inner wall: The main component of the ceramic cup is clay, which will form a layer of glaze on the surface of the clay after being calcined at high temperature. Under normal circumstances, there are no harmful substances in this layer of glaze, so drinking hot water and tea are good choices.
② Ceramic cups with underglaze color: This type of cup is painted first, and then calcined at high temperature. At this time, the pigment is stored under the glaze, and even if it is brewed with hot water, it will not seep out harmful substances, which is relatively healthy. Environmental friendly.
③ Glaze-colored ceramic cups: This type of cup is first painted with pigments on the glaze, and then baked to dry. It is easy to exude harmful substances during use, which is harmful to human health. It is not recommended to use.
Stainless steel cup - do not hold acidic drinks
Stainless steel cups are resistant to rust, wear and tear, and are not easily broken. They are often used as thermos cups and become the first choice for modern cups.
However, because it is an alloy product, it may contain a lot of heavy metal substances. If used improperly, these substances are easy to seep out or undergo chemical reactions, which may produce harmful substances.
Tip: Do not use stainless steel cups for acidic drinks, such as juice, coffee, carbonated drinks, etc.; also do not hold soy sauce, vinegar, vegetable soup, tea, etc. for a long time.
When washing stainless steel cups, do not use strong alkaline or strong oxidizing chemicals, such as soda, bleaching powder, etc. When buying stainless steel utensils, try to go to a reputable large supermarket, and pay attention to whether there are relevant safety signs on the product packaging.
Disposable cups - many health hazards and not environmentally friendly
Disposable cups are also divided into paper and soft plastic materials.
Now the most commonly used is the paper plastic cup, which is a layer of paper on the outside and a layer of coated paper on the inside, which is an inner polyethylene plastic film with relatively high safety;
For example, the plastic cups used in milk tea shops and coffee shops are all made of pet material. As long as they are not heated at high temperatures, they generally do not seep out harmful substances, and they can be used with confidence.
Note: When purchasing, be sure to look for the safety products with the sc mark. However, it is not recommended to use disposable products from an environmental point of view.
Glass - the safest
Of all the materials, glass is relatively safe.
Glass water cups are usually made of inorganic silicates, which are fired at a high temperature of more than 600 degrees. Because of their relatively stable chemical composition, no harmful substances are generated during the firing process;