Part number TST108SO is an AS568-108 white PTFE (Teflon) 55 Shore D Back-Up Ring measuring an inside diameter of 0.237 in (6.02 mm), a cross section of 0.103 in (2.62 mm), and an outside diameter of 0.443 in (11.25 mm). A back-up ring allows a standard o-ring to operate at higher pressures than it could unsupported.
PTFE (Teflon) is specified here for non-stick, non-contaminating surface characteristics and excellent dielectric properties. The material holds up against steam, oxidizing media, and solvents. Rated temperature range runs from -65°F (-53.9°C) to 500°F (260°C) in continuous service. Applications involving elemental fluorine at temperature or service requiring elastic recovery call for a different compound.
Maintenance and OEM teams specify it across laboratory equipment, pharmaceutical and biotech, and chemical processing.
Order part number TST108SO, sold individually. As always, verify media compatibility and operating conditions against the requirements of your specific application.
Description 108 PTFE SOLID BACKUP RING FDA
Actual Cross Section 0.103 inch (2.62 mm)
Actual Inside Diameter 0.237 inch (6.02 mm)
Actual Outside Diameter 0.443 inch (11.25 mm)
Measurement System Imperial
Product Category O-Rings - Backup Rings