2024-04-16
1. Transparency: if it is not colored glass, it should be colorless, particularly transparent, without any impurities, and there are no glass pimples visible to the naked eye.
2. As a cup, its own volume is not large, the material is small, and bubbles are not allowed.
3. If it is not a special-shaped glass, check the roundness of the cup mouth and the bottom of the cup, whether it is a positive circle, and whether the distance from the mouth of each point to the bottom of the cup is absolutely equal.
4. Whether the cup body is molded, if there is any, the workmanship is obviously rough.
5. Whether there are hairs and abrasions.
6. Check the certificate and main materials to see whether it is ordinary glass or borosilicate glass