1. Look at the material. When buying plastic cups, the first thing to look at is the material of the cups, which determines the quality of the cups. 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 degrees to 200 degrees, and the latter is -20 degrees to 120 degrees.

2. look at the use. The water cup is marked with a purpose, so the water cup should be "for eating". Try not to buy cups marked with other uses, otherwise it will have a bad impact on health. Plastic cups that are not marked for use are also recommended.

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

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

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