375 PTFE SOLID BACKUP RING FDA

TST375SO is an AS568-375 white PTFE (Teflon) 55 Shore D Back-Up Ring supplied with an inside diameter of 9.475 in (240.67 mm), a cross section of 0.21 in (5.33 mm), and an outside diameter of 9.895 in (251.33 mm). In service, this back-up ring allows a standard o-ring to operate at higher pressures than it could unsupported.

This material stands up to nearly all industrial chemicals, steam, and oxidizing media. PTFE (Teflon) is specified for near-universal chemical inertness and one of the lowest coefficients of friction of any solid. Service temperature is rated from -65°F (-53.9°C) through 500°F (260°C). Verify compatibility before use with molten alkali metals or elemental fluorine at temperature.

Maintenance and OEM teams specify it across aggressive-media pipelines, chemical processing, and semiconductor fabrication.

Order part number TST375SO, sold individually. Application requirements vary, so validate compatibility with your process conditions prior to installation. Not finding the exact configuration you need? APG cross-references from prints, samples and competitor part numbers.