*2107-258 PTFE SPIRAL B/U FDA

APG stocks the TSP258, an AS568-258 white PTFE (Teflon) 55 Shore D Back-Up Ring supplied with an inside diameter of 5.984 in (151.99 mm), a cross section of 0.139 in (3.53 mm), and an outside diameter of 6.262 in (159.05 mm). A back-up ring installs on the low-pressure side of an o-ring to prevent extrusion into the clearance gap at elevated pressure.

As a material, PTFE (Teflon) is widely chosen for non-stick, non-contaminating surface characteristics and one of the lowest coefficients of friction of any solid. It resists steam, solvents, and oxidizing media. The material carries a published service range of -65°F (-53.9°C) to 500°F (260°C). Verify compatibility before use with elemental fluorine at temperature or service requiring elastic recovery.

You will find this material specified across laboratory equipment, food and beverage, and semiconductor fabrication.

This item is sold individually under part number TSP258. Nominal inside diameter is listed as 6 inch. Confirm chemical compatibility, pressure and temperature against your own application requirements before installing. 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.