Ordered as TST466, this is an AS568-466 white PTFE (Teflon) 55 Shore D Back-Up Ring with an inside diameter of 18.455 in (468.76 mm), a cross section of 0.275 in (6.99 mm), and an outside diameter of 19.005 in (482.73 mm). The back-up ring extends o-ring service life by supporting the seal against extrusion under high pressure.
As a material, PTFE (Teflon) is valued for excellent dielectric properties and a very wide continuous service temperature range. Expect good resistance to solvents, nearly all industrial chemicals, and strong acids and bases. The material carries a published service range of -65°F (-53.9°C) to 500°F (260°C).
Maintenance and OEM teams specify it across chemical processing, semiconductor fabrication, and laboratory equipment.
Order part number TST466, sold individually. Nominal inside diameter is listed as 18 1/2 inch. As always, verify media compatibility and operating conditions against the requirements of your specific application.
Description 2103-466 PTFE S/T BUP FDA
Actual Cross Section 0.275 inch (6.99 mm)
Actual Inside Diameter 18.455 inch (468.76 mm)
Actual Outside Diameter 19.005 inch (482.73 mm)
Measurement System Imperial
Product Category O-Rings - Backup Rings