Part number TST017SO is an AS568-017 white PTFE (Teflon) 55 Shore D Back-Up Ring built to an inside diameter of 0.676 in (17.17 mm), a cross section of 0.07 in (1.78 mm), and an outside diameter of 0.816 in (20.73 mm). A back-up ring extends o-ring service life by supporting the seal against extrusion under high pressure.
PTFE (Teflon) is widely chosen for near-universal chemical inertness and a very wide continuous service temperature range. The material holds up against steam, strong acids and bases, and oxidizing media. Service temperature is rated from -65°F (-53.9°C) through 500°F (260°C). It should not be specified for service in molten alkali metals or service requiring elastic recovery.
You will find this material specified across pharmaceutical and biotech, food and beverage, and laboratory equipment.
Order part number TST017SO, sold individually. Confirm chemical compatibility, pressure and temperature against your own application requirements before installing.
Description 017 PTFE SOLID BACKUP RING FDA
Actual Cross Section 0.07 inch (1.78 mm)
Actual Inside Diameter 0.676 inch (17.17 mm)
Actual Outside Diameter 0.816 inch (20.73 )
Measurement System Imperial
Product Category O-Rings - Backup Rings