Ordered as TSP035, this is an AS568-035 white PTFE (Teflon) 55 Shore D Back-Up Ring measuring an inside diameter of 2.239 in (56.87 mm), a cross section of 0.07 in (1.78 mm), and an outside diameter of 2.379 in (60.43 mm). The 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 one of the lowest coefficients of friction of any solid. It resists steam, strong acids and bases, and nearly all industrial chemicals. 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.
You will find this material specified across semiconductor fabrication, laboratory equipment, and chemical processing.
Order part number TSP035, sold individually. Nominal inside diameter is listed as 2 1/4 inch. Application requirements vary, so validate compatibility with your process conditions prior to installation.
Description *2107-035 PTFE SPIRAL B/U FDA
Actual Cross Section 0.07 inch (1.78 mm)
Actual Inside Diameter 2.239 inch (56.87 mm)
Actual Outside Diameter 2.379 inch (60.43 mm)
Measurement System Imperial
Product Category O-Rings - Backup Rings