**2107-146 PTFE SPIRAL B/U FDA

Ordered as TSP146, this is an AS568-146 white PTFE (Teflon) 55 Shore D Back-Up Ring built to an inside diameter of 2.612 in (66.34 mm), a cross section of 0.103 in (2.62 mm), and an outside diameter of 2.818 in (71.58 mm). The 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 widely chosen for excellent dielectric properties and one of the lowest coefficients of friction of any solid. This material stands up to nearly all industrial chemicals, solvents, and steam. Published continuous service range is -65°F (-53.9°C) to 500°F (260°C). It should not be specified for service in service requiring elastic recovery or elemental fluorine at temperature.

You will find this material specified across pharmaceutical and biotech, food and beverage, and aggressive-media pipelines.

This item is sold individually under part number TSP146. Review your operating media and conditions against this specification before 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.