This back-up ring is supplied in AS568-468 white PTFE (Teflon) 55 Shore D with an inside diameter of 19.455 in (494.16 mm), a cross section of 0.275 in (6.99 mm), and an outside diameter of 20.005 in (508.13 mm), catalogued under part number TST468SO. It bridges the extrusion gap so the primary seal holds its shape under load.
PTFE (Teflon) is specified here for excellent dielectric properties and one of the lowest coefficients of friction of any solid. The compound resists nearly all industrial chemicals, strong acids and bases, and solvents. Published continuous service range is -65°F (-53.9°C) to 500°F (260°C).
Typical settings include laboratory equipment, food and beverage, and aggressive-media pipelines.
Order part number TST468SO, sold individually. Nominal inside diameter is listed as 19 1/2 inch. Check the compound against your process media, pressure and temperature before committing to a design.
Description 468 PTFE SOLID BACKUP RING FDA
Actual Cross Section 0.275 inch (6.99 mm)
Actual Inside Diameter 19.455 inch (494.16 mm)
Actual Outside Diameter 20.005 inch (508.13 mm)
Measurement System Imperial
Product Category O-Rings - Backup Rings