The most commonly used cups are water cups, but there are many kinds of cups. In terms of cup materials, the common ones are glass cups, enamel cups, ceramic cups, plastic cups, stainless steel cups, paper cups, thermos cups, health cups, etc. How to choose a safe water cup suitable for drinking?
1. Plastic cup: choose food-grade plastic
Plastic cups are loved by many people because of their changeable shapes, bright colors, and the characteristics of not being afraid of falling. They are very suitable for outdoor users and office workers. Generally speaking, the bottom of the plastic cup has a mark, which is the number on the small triangle. The common one is “05″, which means that the material of the cup is PP (polypropylene). The cup made of PP has good heat resistance, the melting point is 170 ° C ~ 172 ° C, and the chemical properties are relatively stable. In addition to being corroded by concentrated sulfuric acid and concentrated nitric acid, it is relatively stable to other chemical reagents. But the problem with ordinary plastic cups is widespread. Plastic is a polymer chemical material. When a plastic cup is used to fill hot water or boiling water, the polymer is easily precipitated and dissolved into the water, which is harmful to human health after drinking. Moreover, the internal microstructure of plastic has many pores, which hide dirt, and bacteria will breed if it is not cleaned properly. Therefore, the selection of plastic cups is very important for the selection of plastic materials, and food-grade plastics that meet national standards must be selected. That is PP material.
2. Ceramic cup: choose underglaze color as well
Colorful ceramic water cups are very flattering, but in fact there are huge hidden dangers in those bright paints. The inner wall of an inexpensive colored ceramic cup is usually coated with a layer of glaze. When the glazed cup is filled with boiling water or beverages with high acid and alkalinity, some aluminum and other heavy metal toxic elements in the glaze are easily precipitated and dissolved into the liquid. At this time, when people drink liquid with chemical substances, the human body will be harmed. When using ceramic cups, it is best to use natural color cups. If you can’t resist the temptation of color, you can reach out and touch the color surface. If the surface is smooth, it means that it is underglaze color or underglaze color, which is relatively safe; There will also be a phenomenon of falling off, which means that it is an on-glaze color, and it is best not to buy it.
3. Paper cups: Disposable paper cups should be used sparingly
At present, almost every family and unit will prepare a disposable toilet paper cup, which is used by one person and thrown away after use, which is hygienic and convenient, but such a common cup hides many problems. There are three kinds of paper cups on the market: the first one is made of white cardboard, which cannot hold water and oil. The second is a wax-coated paper cup. As long as the water temperature exceeds 40°C, the wax will melt and release carcinogenic polycyclic aromatic hydrocarbons. The third type is paper-plastic cups. If the selected materials are not good or the processing technology is not good enough, cracking changes will occur during the process of polyethylene hot-melting or smearing on the paper cups, resulting in carcinogens. In order to increase the toughness and stiffness of the cups, plasticizers are added to the paper cups. Hygienic conditions cannot be guaranteed if the dosage is too high or illegal plasticizers are used.
4. Glass: practical and safe to prevent explosion
The first choice for drinking glasses should be glass, especially for office and home users. The glass is not only transparent and beautiful, but among all the materials of the glass, the glass is the healthiest and safest. The glass is made of inorganic silicates, and does not contain organic chemicals during the firing process. When people drink water or other beverages from the glass, they do not have to worry about the chemicals being drunk into their stomachs. ; And the glass surface is smooth and easy to clean, and bacteria and dirt are not easy to breed on the wall of the cup, so it is the healthiest and safest for people to drink water from a glass. However, it should be noted that the glass is most afraid of thermal expansion and contraction, and the glass with too low temperature should not be filled with hot water immediately to prevent it from bursting.
Post time: Dec-26-2022