394 PTFE SOLID BACKUP RING FDA

Part number TST394SO is an AS568-394 white PTFE (Teflon) 55 Shore D Back-Up Ring measuring an inside diameter of 24.94 in (633.48 mm), a cross section of 0.21 in (5.33 mm), and an outside diameter of 25.36 in (644.14 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 excellent dielectric properties and near-universal chemical inertness. The material holds up against oxidizing media, nearly all industrial chemicals, and strong acids and bases. Published continuous service range is -65°F (-53.9°C) to 500°F (260°C). Exposure to elemental fluorine at temperature or service requiring elastic recovery will shorten service life.

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

Reference part number TST394SO when ordering; the item is sold individually. Nominal inside diameter is listed as 25 inch. Application requirements vary, so validate compatibility with your process conditions prior to installation.