Ordered as TST362SO, this is an AS568-362 white PTFE (Teflon) 55 Shore D Back-Up Ring measuring an inside diameter of 6.225 in (158.12 mm), a cross section of 0.21 in (5.33 mm), and an outside diameter of 6.645 in (168.78 mm). The back-up ring bridges the extrusion gap so the primary seal holds its shape under load.
PTFE (Teflon) is specified here for non-stick, non-contaminating surface characteristics and excellent dielectric properties. The compound resists steam, nearly all industrial chemicals, and oxidizing media. Published continuous service range is -65°F (-53.9°C) to 500°F (260°C).
Maintenance and OEM teams specify it across pharmaceutical and biotech, laboratory equipment, and chemical processing.
Stocked as TST362SO and sold individually. Nominal inside diameter is listed as 6 1/4 inch. As always, verify media compatibility and operating conditions against the requirements of your specific application.
Description 362 PTFE SOLID BACKUP RING FDA
Actual Cross Section 0.21 inch (5.33 mm)
Actual Inside Diameter 6.225 inch (158.12 mm)
Actual Outside Diameter 6.645 inch (168.78 mm)
Measurement System Imperial
Product Category O-Rings - Backup Rings