What is the highest quality of rubber?

As a seasoned professional in the field of finance and cryptocurrencies, I must admit that my knowledge of rubber qualities is somewhat limited. However, if I had to pose a question regarding the highest quality of rubber, I would inquire: "What characteristics define the highest quality rubber? Is it its elasticity, durability, or resistance to abrasion? Does it have a specific chemical composition that sets it apart from other grades? Furthermore, how does this high-quality rubber perform in various applications, from automotive parts to industrial machinery? And finally, are there any certification standards or industry benchmarks that are used to gauge the quality of rubber?" Understanding these aspects would help in determining the precise nature of the highest quality rubber.