1, the first thing to buy a plastic cup is the material of the cup, which determines the quality of the cup. Generally speaking, silicone resin is better, followed by polypropylene particles (pp), which are resistant to high temperature and low temperature. The temperature range of the former is -40℃ -200℃, and the latter is -20℃ -65433.

2. The cup of the water cup will be marked with the purpose, so the water cup should be "used to hold food". Try not to buy cups marked with other uses, otherwise it will have a negative impact on health. Plastic cups that are not marked for use are also recommended.

3, a good plastic cup, even if it smells new, will not have a very special smell, but some inferior plastic cups can smell pungent inferior plastic or rubber as soon as they get close, indicating that the quality of this cup is very poor, try not to buy it.

4. Before the production of water cups, a special organization needs to issue a license, so the bottle body of water cups will be marked with "QS" production license sign. Although this logo does not determine the quality of the cup, the cup with this logo can be considered for purchase. Moreover, the logo should be pure in color and clear in pattern, and beware of counterfeiting.

5. The cups produced by regular manufacturers will be clearly marked with the specific manufacturer, production address, distributor and specific contact information. The above information of inferior cups is often vague or there is no similar information at all.