252 PTFE SOLID BACKUP RING FDA

Part number TST252SO is an AS568-252 white PTFE (Teflon) 55 Shore D Back-Up Ring measuring an inside diameter of 5.234 in (132.94 mm), a cross section of 0.139 in (3.53 mm), and an outside diameter of 5.512 in (140 mm). A back-up ring bridges the extrusion gap so the primary seal holds its shape under load.

PTFE (Teflon) is specified here for near-universal chemical inertness and non-stick, non-contaminating surface characteristics. This material stands up to nearly all industrial chemicals, steam, and strong acids and bases. Service temperature is rated from -65°F (-53.9°C) through 500°F (260°C).

It sees regular use in aggressive-media pipelines, chemical processing, and food and beverage.

TST252SO ships individually. Nominal inside diameter is listed as 5 1/4 inch. As always, verify media compatibility and operating conditions against the requirements of your specific application.