120 PTFE SOLID BACKUP RING FDA

Part number TST120SO is an AS568-120 white PTFE (Teflon) 55 Shore D Back-Up Ring measuring an inside diameter of 0.987 in (25.07 mm), a cross section of 0.103 in (2.62 mm), and an outside diameter of 1.193 in (30.3 mm). A back-up ring extends o-ring service life by supporting the seal against extrusion under high pressure.

PTFE (Teflon) is specified here for near-universal chemical inertness and excellent dielectric properties. It resists oxidizing media, nearly all industrial chemicals, and steam. 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 elemental fluorine at temperature or molten alkali metals.

Common environments for this compound include chemical processing, food and beverage, and aggressive-media pipelines.

TST120SO ships individually. Nominal inside diameter is listed as 1 inch. Application requirements vary, so validate compatibility with your process conditions prior to installation.