Santoprene is a brand of thermoplastic elastomer from the American AES Company. Thermoplastic elastomer, to put it simply: this material is a kind of rubber, but this rubber can be thermoformed repeatedly. General rubber can only be vulcanized once and cannot be re-molded and used. Therefore, many parts that require secondary molding and assembly require this material, such as sealing rings in ball valves, etc. The main components of this material are ethylene propylene diene rubber (EPDM) and polypropylene (PP). In addition to santoprene, the brand sarlink of the Dutch company DSM is also very good at making this kind of material. Domestically, Nanjing Jinling Optopolymer Materials Co., Ltd. is also doing very well. Its registered trademark is Pacrel, the price is much cheaper, and it also provides technical support in all aspects. If you are interested, please contact JSJLOPTA@163.COM