2103-225 PTFE S/T BUP FDA

Part number TST225 is an AS568-225 white PTFE (Teflon) 55 Shore D Back-Up Ring built to an inside diameter of 1.859 in (47.22 mm), a cross section of 0.139 in (3.53 mm), and an outside diameter of 2.137 in (54.28 mm). A back-up ring bridges the extrusion gap so the primary seal holds its shape under load.

PTFE (Teflon) is specified here for excellent dielectric properties and non-stick, non-contaminating surface characteristics. It resists solvents, oxidizing media, and steam. Continuous operating temperature is published at -65°F (-53.9°C) to 500°F (260°C). It is not the right choice where molten alkali metals or service requiring elastic recovery are present.

Maintenance and OEM teams specify it across semiconductor fabrication, chemical processing, and aggressive-media pipelines.

Stocked as TST225 and sold individually. Check the compound against your process media, pressure and temperature before committing to a design. Not finding the exact configuration you need? APG cross-references from prints, samples and competitor part numbers.