... an outer jacket of PTFE-FEP protecting resilient core Encapsulated O-ringsEncapsulated O-rings combine the qualities of PTFE ... good resistance to compression set, even at high temperatures Encapsulated O-rings can be used in the following applications:Mechanical ... steam, air, gases, and toxic compounds)Flowmeters (successful in Fuel Oil Tankers carrying industrial and domestic heating oil, and in ...