Plastic bottle caps are something we often see in our daily lives. Mineral water bottle caps are made of plastic, and cooking oil bottle caps are also plastic. The caps of many liquid bottles are made of plastic. They are made of this material. The bottle caps have very good leak-proof performance and can effectively prevent the liquid inside the bottle from being contaminated by the outside world. So do you know what the performance characteristics of plastic bottle caps are? In addition, do you know what classifications they have?