Ordered as TST175, this is an AS568-175 white PTFE (Teflon) 55 Shore D Back-Up Ring with an inside diameter of 8.987 in (228.27 mm), a cross section of 0.103 in (2.62 mm), and an outside diameter of 9.193 in (233.5 mm). The back-up ring allows a standard o-ring to operate at higher pressures than it could unsupported.
The compound resists oxidizing media, strong acids and bases, and solvents. That behavior comes from the compound itself: PTFE (Teflon) offers one of the lowest coefficients of friction of any solid and near-universal chemical inertness. Published continuous service range is -65°F (-53.9°C) to 500°F (260°C).
Common environments for this compound include pharmaceutical and biotech, food and beverage, and laboratory equipment.
Stocked as TST175 and sold individually. Confirm chemical compatibility, pressure and temperature against your own application requirements before installing.
Description 2103-175 PTFE S/T BUP FDA
Actual Cross Section 0.103 inch (2.62 mm)
Actual Inside Diameter 8.987 inch (228.27 mm)
Actual Outside Diameter 9.193 inch (233.5 mm)
Measurement System Imperial
Product Category O-Rings - Backup Rings