This back-up ring is supplied in AS568-311 white PTFE (Teflon) 55 Shore D with an inside diameter of 0.537 in (13.64 mm), a cross section of 0.21 in (5.33 mm), and an outside diameter of 0.957 in (24.31 mm), catalogued under part number TST311SO. It extends o-ring service life by supporting the seal against extrusion under high pressure.
PTFE (Teflon) is specified for a very wide continuous service temperature range and near-universal chemical inertness. It resists steam, nearly all industrial chemicals, and solvents. Rated temperature range runs from -65°F (-53.9°C) to 500°F (260°C) in continuous service. Applications involving service requiring elastic recovery or elemental fluorine at temperature call for a different compound.
Maintenance and OEM teams specify it across food and beverage, aggressive-media pipelines, and laboratory equipment.
Order part number TST311SO, sold individually. Confirm chemical compatibility, pressure and temperature against your own application requirements before installing.
Description 311 PTFE SOLID BACKUP RING FDA
Actual Cross Section 0.21 inch (5.33 mm)
Actual Inside Diameter 0.537 inch (13.64 mm)
Actual Outside Diameter 0.957 inch (24.31 mm)
Measurement System Imperial
Product Category O-Rings - Backup Rings