269 PTFE SOLID BACKUP RING FDA

Part number TST269SO is an AS568-269 white PTFE (Teflon) 55 Shore D Back-Up Ring measuring an inside diameter of 8.734 in (221.84 mm), a cross section of 0.139 in (3.53 mm), and an outside diameter of 9.012 in (228.9 mm). A back-up ring extends o-ring service life by supporting the seal against extrusion under high pressure.

PTFE (Teflon) is valued for one of the lowest coefficients of friction of any solid and excellent dielectric properties. This material stands up to nearly all industrial chemicals, strong acids and bases, and steam. The material carries a published service range of -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 aggressive-media pipelines, pharmaceutical and biotech, and semiconductor fabrication.

Reference part number TST269SO when ordering; the item is sold individually. Nominal inside diameter is listed as 8 3/4 inch. Confirm chemical compatibility, pressure and temperature against your own application requirements before installing.