268 PTFE SOLID BACKUP RING FDA

This back-up ring is supplied in AS568-268 white PTFE (Teflon) 55 Shore D supplied with an inside diameter of 8.484 in (215.49 mm), a cross section of 0.139 in (3.53 mm), and an outside diameter of 8.762 in (222.55 mm), catalogued under part number TST268SO. It bridges the extrusion gap so the primary seal holds its shape under load.

The compound resists solvents, oxidizing media, and strong acids and bases. That behavior comes from the compound itself: PTFE (Teflon) is widely chosen for excellent dielectric properties and near-universal chemical inertness. Rated temperature range runs from -65°F (-53.9°C) to 500°F (260°C) in continuous service. Verify compatibility before use with service requiring elastic recovery or elemental fluorine at temperature.

Maintenance and OEM teams specify it across aggressive-media pipelines, laboratory equipment, and semiconductor fabrication.

Stocked as TST268SO and sold individually. Nominal inside diameter is listed as 8 1/2 inch. As always, verify media compatibility and operating conditions against the requirements of your specific application.