TST437SO is an AS568-437 white PTFE (Teflon) 55 Shore D Back-Up Ring with an inside diameter of 5.975 in (151.77 mm), a cross section of 0.275 in (6.99 mm), and an outside diameter of 6.525 in (165.74 mm). In service, this back-up ring extends o-ring service life by supporting the seal against extrusion under high pressure.
PTFE (Teflon) is specified here for one of the lowest coefficients of friction of any solid and near-universal chemical inertness. The compound resists steam, strong acids and bases, and oxidizing media. Published continuous service range is -65°F (-53.9°C) to 500°F (260°C). It should not be specified for service in elemental fluorine at temperature or service requiring elastic recovery.
You will find this material specified across food and beverage, chemical processing, and semiconductor fabrication.
Order part number TST437SO, sold individually. Application requirements vary, so validate compatibility with your process conditions prior to installation.
Description *437 PTFE SOLID BACKUP RING FDA
Actual Cross Section 0.275 inch (6.99 mm)
Actual Inside Diameter 5.975 inch (151.77 mm)
Actual Outside Diameter 6.525 inch (165.74 mm)
Measurement System Imperial
Product Category O-Rings - Backup Rings