2103-395 PTFE S/T BUP FDA

Ordered as TST395, this is an AS568-395 white PTFE (Teflon) 55 Shore D Back-Up Ring built to an inside diameter of 25.94 in (658.88 mm), a cross section of 0.21 in (5.33 mm), and an outside diameter of 26.36 in (669.54 mm). The back-up ring installs on the low-pressure side of an o-ring to prevent extrusion into the clearance gap at elevated pressure.

Expect good resistance to oxidizing media, steam, and strong acids and bases. PTFE (Teflon) is specified for excellent dielectric properties and a very wide continuous service temperature range. Continuous operating temperature is published at -65°F (-53.9°C) to 500°F (260°C). Verify compatibility before use with elemental fluorine at temperature or molten alkali metals.

Typical settings include food and beverage, laboratory equipment, and chemical processing.

Reference part number TST395 when ordering; the item is sold individually. Nominal inside diameter is listed as 26 inch. As always, verify media compatibility and operating conditions against the requirements of your specific application. For a size or compound outside the standard catalog, APG can quote from a print or sample.