Part number TST133SO is an AS568-133 white PTFE (Teflon) 55 Shore D Back-Up Ring measuring an inside diameter of 1.799 in (45.69 mm), a cross section of 0.103 in (2.62 mm), and an outside diameter of 2.005 in (50.93 mm). A back-up ring allows a standard o-ring to operate at higher pressures than it could unsupported.
Expect good resistance to steam, solvents, and strong acids and bases. PTFE (Teflon) offers near-universal chemical inertness and non-stick, non-contaminating surface characteristics. Continuous operating temperature is published at -65°F (-53.9°C) to 500°F (260°C). Applications involving elemental fluorine at temperature or service requiring elastic recovery call for a different compound.
You will find this material specified across pharmaceutical and biotech, semiconductor fabrication, and aggressive-media pipelines.
Stocked as TST133SO and sold individually. Nominal inside diameter is listed as 1 13/16 inch. Application requirements vary, so validate compatibility with your process conditions prior to installation.
Description 133 PTFE SOLID BACKUP RING FDA
Actual Cross Section 0.103 inch (2.62 mm)
Actual Inside Diameter 1.799 inch (45.69 mm)
Actual Outside Diameter 2.005 inch (50.93 mm)
Measurement System Imperial
Product Category O-Rings - Backup Rings