TST149 is an AS568-149 white PTFE (Teflon) 55 Shore D Back-Up Ring supplied with an inside diameter of 2.8 in (71.12 mm), a cross section of 0.103 in (2.62 mm), and an outside diameter of 3.006 in (76.35 mm). In service, this 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 one of the lowest coefficients of friction of any solid and non-stick, non-contaminating surface characteristics. This material stands up to oxidizing media, steam, and solvents. Continuous operating temperature is published at -65°F (-53.9°C) to 500°F (260°C).
It sees regular use in chemical processing, semiconductor fabrication, and food and beverage.
Order part number TST149, sold individually. Nominal inside diameter is listed as 2 13/16 inch. Confirm chemical compatibility, pressure and temperature against your own application requirements before installing. Not finding the exact configuration you need? APG cross-references from prints, samples and competitor part numbers.
Description 2103-149 PTFE S/T BUP FDA
Actual Cross Section 0.103 inch (2.62 mm)
Actual Inside Diameter 2.8 inch (71.12 mm)
Actual Outside Diameter 3.006 inch (76.35 mm)
Measurement System Imperial
Product Category O-Rings - Backup Rings