TST464SO is an AS568-464 white PTFE (Teflon) 55 Shore D Back-Up Ring built to an inside diameter of 17.455 in (443.36 mm), a cross section of 0.275 in (6.99 mm), and an outside diameter of 18.005 in (457.33 mm). In service, this back-up ring installs on the low-pressure side of an o-ring to prevent extrusion into the clearance gap at elevated pressure.
It resists strong acids and bases, oxidizing media, and steam. That behavior comes from the compound itself: PTFE (Teflon) is known for a very wide continuous service temperature range and one of the lowest coefficients of friction of any solid. Continuous operating temperature is published at -65°F (-53.9°C) to 500°F (260°C).
You will find this material specified across aggressive-media pipelines, pharmaceutical and biotech, and food and beverage.
Order part number TST464SO, sold individually. Nominal inside diameter is listed as 17 1/2 inch. Review your operating media and conditions against this specification before installation.
Description 464 PTFE SOLID BACKUP RING FDA
Actual Cross Section 0.275 inch (6.99 mm)
Actual Inside Diameter 17.455 inch (443.36 mm)
Actual Outside Diameter 18.005 inch (457.33 mm)
Measurement System Imperial
Product Category O-Rings - Backup Rings