Disposable paper cups are mainly divided into three types: one is made of white cardboard, which is mainly used to hold dry things and cannot hold water and oil; The second type is a wax paper cup, because it is soaked in wax, which is waterproof and thick, but as long as the water temperature in the cup exceeds 40℃, the wax will melt, and the wax contains carcinogenic polycyclic aromatic hydrocarbons; The third type is the paper-plastic cup that people generally use now, with a layer of paper outside and a layer of coated paper inside. If the materials used in production are not good or the processing technology is not up to standard, harmful substances will be produced.