How To Choose A Safe Water Cup Suitable For Drinking

Water cups are the most commonly used on weekdays, but there are many types of cups. As far as cup materials are concerned, glass cups, enamel cups, ceramic cups, plastic cups, stainless steel cups, paper cups, thermos cups, health care cups, etc. are common. How to choose a safe water cup suitable for drinking.
Plastic cups are loved by many people because of their changeable shapes, bright colors, and the characteristics of not being afraid of being beaten. 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). PP cups have good heat resistance, with a melting point of 170 ° C ~ 172 ° C, and relatively stable chemical properties. In addition to being corroded by concentrated sulfuric acid and concentrated nitric acid, they are relatively stable to various other chemical reagents. But the problem with ordinary plastic cups is widespread. Plastic belongs to macromolecule chemical material. When hot water or boiled water is filled in a plastic cup, the macromolecule is easy to precipitate and dissolve 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. 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.
Colorful ceramic water cups are very flattering, but in fact there are huge hidden dangers hidden in those bright paints. The inner wall of a cheap colored ceramic cup is usually coated with a layer of glaze. When the glazed cup is filled with boiling water or acidic or alkaline beverages, some aluminum and other heavy metal toxic elements in the glaze are easily precipitated and dissolved into the liquid. At this time, people drink the liquid with chemical substances, and the human body will be hurt. It is best to choose natural color cups when using ceramic cups. If you can’t resist the temptation of colors, reach out and touch the surface of the color. If the surface is smooth, it means that it is underglaze color or in-glaze color, which is relatively safe; If there will be falling off, it means that it is glaze color, so it is best not to buy it.
At present, almost every family and unit prepares disposable toilet paper cups, which are used by one person and thrown away after use. It is hygienic and convenient, but such a common cup hides many problems. There are three types of paper cups on the market: the first one is made of white cardboard and cannot hold water and oil. The second is a waxed paper cup. As long as the temperature of the water in it 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, in the process of hot-melting or applying polyethylene to paper cups, cracking changes will occur and carcinogens will be produced. In order to increase the toughness and rigidity of the cup, plasticizers are added to the paper cup.