2103-372 PTFE S/T BUP FDA

Ordered as TST372, this is an AS568-372 white PTFE (Teflon) 55 Shore D Back-Up Ring supplied with an inside diameter of 8.725 in (221.62 mm), a cross section of 0.21 in (5.33 mm), and an outside diameter of 9.145 in (232.28 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.

As a material, PTFE (Teflon) offers near-universal chemical inertness and excellent dielectric properties. The compound resists strong acids and bases, solvents, and nearly all industrial chemicals. Continuous operating temperature is published at -65°F (-53.9°C) to 500°F (260°C). It is not the right choice where service requiring elastic recovery or elemental fluorine at temperature are present.

You will find this material specified across laboratory equipment, semiconductor fabrication, and chemical processing.

Stocked as TST372 and sold individually. Nominal inside diameter is listed as 8 3/4 inch. Review your operating media and conditions against this specification before installation.