Part number TST229SO is an AS568-229 white PTFE (Teflon) 55 Shore D Back-Up Ring supplied with an inside diameter of 2.359 in (59.92 mm), a cross section of 0.139 in (3.53 mm), and an outside diameter of 2.637 in (66.98 mm). A back-up ring allows a standard o-ring to operate at higher pressures than it could unsupported.
The material holds up against solvents, nearly all industrial chemicals, and steam. That behavior comes from the compound itself: PTFE (Teflon) is known for one of the lowest coefficients of friction of any solid and a very wide continuous service temperature range. Continuous operating temperature is published at -65°F (-53.9°C) to 500°F (260°C). Verify compatibility before use with molten alkali metals or service requiring elastic recovery.
Typical settings include laboratory equipment, pharmaceutical and biotech, and chemical processing.
This item is sold individually under part number TST229SO. 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 229 PTFE SOLID BACKUP RING FDA
Actual Cross Section 0.139 inch (3.53 mm)
Actual Inside Diameter 2.359 inch (59.92 mm)
Actual Outside Diameter 2.637 inch (66.98 mm)
Measurement System Imperial
Product Category O-Rings - Backup Rings