APG stocks the TST140SO, an AS568-140 white PTFE (Teflon) 55 Shore D Back-Up Ring measuring an inside diameter of 2.237 in (56.82 mm), a cross section of 0.103 in (2.62 mm), and an outside diameter of 2.443 in (62.05 mm). A back-up ring bridges the extrusion gap so the primary seal holds its shape under load.
PTFE (Teflon) is specified here for very wide continuous service temperature range and excellent dielectric properties. This material stands up to steam, oxidizing media, and nearly all industrial chemicals. Published continuous service range is -65°F (-53.9°C) to 500°F (260°C).
You will find this material specified across aggressive-media pipelines, pharmaceutical and biotech, and chemical processing.
TST140SO ships individually. Confirm chemical compatibility, pressure and temperature against your own application requirements before installing. APG supports cross-referencing from drawings, samples and competitor numbers when a listed size is not an exact fit.
Description 140 PTFE SOLID BACKUP RING FDA
Actual Cross Section 0.103 inch (2.62 mm)
Actual Inside Diameter 2.237 inch (56.82 mm)
Actual Outside Diameter 2.443 inch (62.05 mm)
Measurement System Imperial
Product Category O-Rings - Backup Rings