AJR Seals list of available in-stock inventory of standard AS 568 size PTFE solid back-up rings, designed to be used between an o-ring and the extrusion gap.  Temp. Range: -95˚F to 480˚F (-70˚C to 250˚C). Other quantities, sizes and materials are available to be ordered. Use the drop down menu to check additional inventory or the link in top menu to request a quote.