The TSP451 is an AS568-451 white PTFE (Teflon) 55 Shore D Back-Up Ring with an inside diameter of 10.975 in (278.77 mm), a cross section of 0.275 in (6.99 mm), and an outside diameter of 11.525 in (292.74 mm). This back-up ring extends o-ring service life by supporting the seal against extrusion under high pressure.
PTFE (Teflon) is specified here for near-universal chemical inertness and excellent dielectric properties. The compound resists steam, solvents, and oxidizing media. Rated temperature range runs from -65°F (-53.9°C) to 500°F (260°C) in continuous service. It should not be specified for service in elemental fluorine at temperature or molten alkali metals.
Common environments for this compound include food and beverage, aggressive-media pipelines, and chemical processing.
Order part number TSP451, sold individually. Nominal inside diameter is listed as 11 inch. Application requirements vary, so validate compatibility with your process conditions prior to installation. If you need a size, durometer or compound that is not listed, APG can cross-reference from a print, a sample or a competitor part number.
Description *2107-451 PTFE SPIRAL B/U FDA
Actual Cross Section 0.275 inch (6.99 mm)
Actual Inside Diameter 10.975 inch (278.77 mm)
Actual Outside Diameter 11.525 inch (292.74 mm)
Measurement System Imperial
Product Category O-Rings - Backup Rings