2103-383 PTFE S/T BUP FDA

Ordered as TST383, this is an AS568-383 white PTFE (Teflon) 55 Shore D Back-Up Ring with an inside diameter of 13.975 in (354.97 mm), a cross section of 0.21 in (5.33 mm), and an outside diameter of 14.395 in (365.63 mm). The back-up ring allows a standard o-ring to operate at higher pressures than it could unsupported.

The compound resists steam, oxidizing media, and strong acids and bases. That behavior comes from the compound itself: PTFE (Teflon) offers near-universal chemical inertness and excellent dielectric properties. 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 molten alkali metals are present.

Common environments for this compound include laboratory equipment, chemical processing, and semiconductor fabrication.

This item is sold individually under part number TST383. Application requirements vary, so validate compatibility with your process conditions prior to installation. APG supports cross-referencing from drawings, samples and competitor numbers when a listed size is not an exact fit.