2. Just note that the PS material of the cup is polystyrene, which is particularly brittle and resistant to low temperature. Can not be used in high temperature, strong acid and strong alkali environment.

3. The water cup made of 3.ps is non-toxic if it is filled with water below 60 or below 80 in a short time; When the water temperature exceeds 60 or 80 for a long time, it will reach the glass transition temperature.