Our PTFE coated O-rings consist of two key components: a flexible inner core and a dense outer coating.
 The inner core is made of high-quality silicone rubber or fluororubber (FKM), which provides excellent elasticity and sealing performance. 
The outer layer is a thin, seamless PTFE FEP (Fluorinated Ethylene Propylene) or PTFE PFA (Perfluoroalkoxy) coating,
 which is tightly combined with the inner core through a special manufacturing process to ensure uniform coverage and stable performance