449 PTFE SOLID BACKUP RING FDA

APG stocks the TST449SO, an AS568-449 white PTFE (Teflon) 55 Shore D Back-Up Ring with an inside diameter of 9.975 in (253.37 mm), a cross section of 0.275 in (6.99 mm), and an outside diameter of 10.525 in (267.34 mm). A back-up ring bridges the extrusion gap so the primary seal holds its shape under load.

As a material, PTFE (Teflon) offers one of the lowest coefficients of friction of any solid and a very wide continuous service temperature range. Expect good resistance to solvents, strong acids and bases, and oxidizing media. 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 service requiring elastic recovery.

You will find this material specified across pharmaceutical and biotech, chemical processing, and aggressive-media pipelines.

Reference part number TST449SO when ordering; the item is sold individually. Nominal inside diameter is listed as 10 inch. Application requirements vary, so validate compatibility with your process conditions prior to installation.