How to buy cups

Empty glass, also known as PC engineering plastics, is a widely used material worldwide, and its main component is polycarbonate. This material is light and durable, with excellent insulation, extensibility, dimensional stability, chemical resistance, and high strength, heat resistance and cold resistance. It also has the advantages of self-extinguishing, flame retardant, non-toxic, colorable, etc. The disadvantage is that it has insufficient hardness compared to metal, which leads to its appearance being easily scratched.

The first is to look at, the first thing is to look at the appearance of the cup. One is to see if the surface polishing of the inner and outer bladders is uniform, whether there are bruises and scratches; second, whether the welding of the mouth is smooth and consistent, which is related to whether it feels comfortable when drinking water; third, the quality of the plastic parts is poor. Not only will it affect the service life, it will also affect the sanitation of drinking water; Fourth, see if the internal seal is tight. Whether the screw plug fits the cup properly. Whether the screw-in and screw-out are free and leaking. Fill a glass of water upside down for four or five minutes or shake it a few times to verify the leak.