278 PTFE SOLID BACKUP RING FDA

Part number TST278SO is an AS568-278 white PTFE (Teflon) 55 Shore D Back-Up Ring supplied with an inside diameter of 11.984 in (304.39 mm), a cross section of 0.139 in (3.53 mm), and an outside diameter of 12.262 in (311.45 mm). A back-up ring bridges the extrusion gap so the primary seal holds its shape under load.

This material stands up to oxidizing media, solvents, and steam. That behavior comes from the compound itself: PTFE (Teflon) delivers non-stick, non-contaminating surface characteristics and near-universal chemical inertness. Service temperature is rated from -65°F (-53.9°C) through 500°F (260°C). Verify compatibility before use with elemental fluorine at temperature or service requiring elastic recovery.

Typical settings include aggressive-media pipelines, semiconductor fabrication, and laboratory equipment.

Order part number TST278SO, sold individually. Nominal inside diameter is listed as 12 inch. Review your operating media and conditions against this specification before installation.