2. Plastic is a polymer chemical material. When hot water or boiled water is filled in plastic cups, polymers are easy to precipitate and dissolve in water, which is harmful to human health after drinking. Moreover, there are many pores in the internal microstructure of plastic, which contain dirt, and improper cleaning will breed bacteria. Therefore, it is very important to choose a plastic cup for the choice of plastic material. Be sure to choose food-grade plastics that meet national standards.
3. Food-grade plastic cups are generally harmless to the body. Food-grade plastic cups are made of high molecular polymers, which usually have no effect on the body. Drinking cold water or cold drinks won't do much harm. If it is hot water or hot drink, it will react with plastic cups more or less, which may produce substances harmful to human body. Therefore, try not to drink hot water with plastic cups. The first choice for drinking cups should be glass. Among all materials, glass is relatively healthy.