The TSP231 is an AS568-231 white PTFE (Teflon) 55 Shore D Back-Up Ring built to an inside diameter of 2.609 in (66.27 mm), a cross section of 0.139 in (3.53 mm), and an outside diameter of 2.887 in (73.33 mm). This back-up ring extends o-ring service life by supporting the seal against extrusion under high pressure.
The compound resists oxidizing media, solvents, and strong acids and bases. That behavior comes from the compound itself: PTFE (Teflon) is known for a very wide continuous service temperature range and non-stick, non-contaminating surface characteristics. Service temperature is rated from -65°F (-53.9°C) through 500°F (260°C). It is not the right choice where service requiring elastic recovery or elemental fluorine at temperature are present.
It sees regular use in semiconductor fabrication, laboratory equipment, and chemical processing.
Stocked as TSP231 and sold individually. As always, verify media compatibility and operating conditions against the requirements of your specific application. If you need a size, durometer or compound that is not listed, APG can cross-reference from a print, a sample or a competitor part number.
Description 2107-231 PTFE SPIRAL B/U FDA
Actual Cross Section 0.139 inch (3.53 mm)
Actual Inside Diameter 2.609 inch (66.27 mm)
Actual Outside Diameter 2.887 inch (73.33 mm)
Measurement System Imperial
Product Category O-Rings - Backup Rings