353 PTFE SOLID BACKUP RING FDA

This back-up ring is supplied in AS568-353 white PTFE (Teflon) 55 Shore D built to an inside diameter of 4.975 in (126.37 mm), a cross section of 0.21 in (5.33 mm), and an outside diameter of 5.395 in (137.03 mm), catalogued under part number TST353SO. It installs on the low-pressure side of an o-ring to prevent extrusion into the clearance gap at elevated pressure.

It resists steam, oxidizing media, and strong acids and bases. PTFE (Teflon) is valued for non-stick, non-contaminating surface characteristics and one of the lowest coefficients of friction of any solid. Published continuous service range is -65°F (-53.9°C) to 500°F (260°C). Verify compatibility before use with molten alkali metals or elemental fluorine at temperature.

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

Order part number TST353SO, sold individually. Nominal inside diameter is listed as 5 inch. Confirm chemical compatibility, pressure and temperature against your own application requirements before installing.