*115 PTFE SOLID BACKUP RING FDA

APG stocks the TST115SO, an AS568-115 white PTFE (Teflon) 55 Shore D Back-Up Ring supplied with an inside diameter of 0.674 in (17.12 mm), a cross section of 0.103 in (2.62 mm), and an outside diameter of 0.88 in (22.35 mm). A 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) is widely chosen for one of the lowest coefficients of friction of any solid and excellent dielectric properties. This material stands up to steam, nearly all industrial chemicals, 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.

Typical settings include food and beverage, laboratory equipment, and chemical processing.

TST115SO ships individually. Confirm chemical compatibility, pressure and temperature against your own application requirements before installing. For a size or compound outside the standard catalog, APG can quote from a print or sample.