Part number TST142SO is an AS568-142 white PTFE (Teflon) 55 Shore D Back-Up Ring supplied with an inside diameter of 2.362 in (59.99 mm), a cross section of 0.103 in (2.62 mm), and an outside diameter of 2.568 in (65.23 mm). A back-up ring installs on the low-pressure side of an o-ring to prevent extrusion into the clearance gap at elevated pressure.
PTFE (Teflon) is specified here for near-universal chemical inertness and non-stick, non-contaminating surface characteristics. The material holds up against strong acids and bases, steam, and solvents. Continuous operating temperature is published at -65°F (-53.9°C) to 500°F (260°C).
It sees regular use in aggressive-media pipelines, laboratory equipment, and chemical processing.
Stocked as TST142SO and sold individually. Application requirements vary, so validate compatibility with your process conditions prior to installation. If you need a size, durometer or compound that is not listed, APG can cross-reference from a print, a sample or a competitor part number.
Description 142 PTFE SOLID BACKUP RING FDA
Actual Cross Section 0.103 inch (2.62 mm)
Actual Inside Diameter 2.362 inch (59.99 mm)
Actual Outside Diameter 2.568 inch (65.23 mm)
Measurement System Imperial
Product Category O-Rings - Backup Rings