*474 PTFE SOLID BACKUP RING FDA

Part number TST474SO is an AS568-474 white PTFE (Teflon) 55 Shore D Back-Up Ring with an inside diameter of 24.94 in (633.48 mm), a cross section of 0.275 in (6.99 mm), and an outside diameter of 25.49 in (647.45 mm). A back-up ring allows a standard o-ring to operate at higher pressures than it could unsupported.

This material stands up to solvents, oxidizing media, and nearly all industrial chemicals. PTFE (Teflon) is specified for one of the lowest coefficients of friction of any solid and near-universal chemical inertness. Published continuous service range is -65°F (-53.9°C) to 500°F (260°C). Exposure to molten alkali metals or elemental fluorine at temperature will shorten service life.

Typical settings include food and beverage, semiconductor fabrication, and chemical processing.

Reference part number TST474SO when ordering; the item is sold individually. Nominal inside diameter is listed as 25 inch. Confirm chemical compatibility, pressure and temperature against your own application requirements before installing.