TST378 is an AS568-378 white PTFE (Teflon) 55 Shore D Back-Up Ring measuring an inside diameter of 10.475 in (266.07 mm), a cross section of 0.21 in (5.33 mm), and an outside diameter of 10.895 in (276.73 mm). In service, this back-up ring bridges the extrusion gap so the primary seal holds its shape under load.
PTFE (Teflon) offers excellent dielectric properties and a very wide continuous service temperature range. The compound resists solvents, oxidizing media, and strong acids and bases. Published continuous service range is -65°F (-53.9°C) to 500°F (260°C).
Typical settings include semiconductor fabrication, laboratory equipment, and chemical processing.
TST378 ships individually. Application requirements vary, so validate compatibility with your process conditions prior to installation.
Description 2103-378 PTFE S/T BUP FDA
Actual Cross Section 0.21 inch (5.33 mm)
Actual Inside Diameter 10.475 inch (266.07 mm)
Actual Outside Diameter 10.895 inch (276.73 mm)
Measurement System Imperial
Product Category O-Rings - Backup Rings