2107-335 PTFE SPIRAL B/U FDA

APG stocks the TSP335, an AS568-335 white PTFE (Teflon) 55 Shore D Back-Up Ring with an inside diameter of 2.725 in (69.22 mm), a cross section of 0.21 in (5.33 mm), and an outside diameter of 3.145 in (79.88 mm). A back-up ring extends o-ring service life by supporting the seal against extrusion under high pressure.

Expect good resistance to strong acids and bases, steam, and nearly all industrial chemicals. That behavior comes from the compound itself: PTFE (Teflon) offers near-universal chemical inertness and a very wide continuous service temperature range. The material carries a published service range of -65°F (-53.9°C) to 500°F (260°C). It should not be specified for service in molten alkali metals or elemental fluorine at temperature.

Common environments for this compound include pharmaceutical and biotech, chemical processing, and semiconductor fabrication.

TSP335 ships individually. Nominal inside diameter is listed as 2 3/4 inch. As always, verify media compatibility and operating conditions against the requirements of your specific application.