APG stocks the TST123SO, an AS568-123 white PTFE (Teflon) 55 Shore D Back-Up Ring measuring an inside diameter of 1.174 in (29.82 mm), a cross section of 0.103 in (2.62 mm), and an outside diameter of 1.38 in (35.05 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 one of the lowest coefficients of friction of any solid and non-stick, non-contaminating surface characteristics. It resists nearly all industrial chemicals, solvents, and oxidizing media. Rated temperature range runs from -65°F (-53.9°C) to 500°F (260°C) in continuous service. It is not the right choice where service requiring elastic recovery or molten alkali metals are present.
You will find this material specified across laboratory equipment, semiconductor fabrication, and chemical processing.
Order part number TST123SO, sold individually. Application requirements vary, so validate compatibility with your process conditions prior to installation.
Description *123 PTFE SOLID BACKUP RING FDA
Actual Cross Section 0.103 inch (2.62 mm)
Actual Inside Diameter 1.174 inch (29.82 mm)
Actual Outside Diameter 1.38 inch (35.05 mm)
Measurement System Imperial
Product Category O-Rings - Backup Rings