2103-128 PTFE S/T BUP FDA

The TST128 is an AS568-128 white PTFE (Teflon) 55 Shore D Back-Up Ring built to an inside diameter of 1.487 in (37.77 mm), a cross section of 0.103 in (2.62 mm), and an outside diameter of 1.693 in (43 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 one of the lowest coefficients of friction of any solid and very wide continuous service temperature range. The compound resists strong acids and bases, steam, and nearly all industrial chemicals. Published continuous service range is -65°F (-53.9°C) to 500°F (260°C). Applications involving service requiring elastic recovery or elemental fluorine at temperature call for a different compound.

Common environments for this compound include pharmaceutical and biotech, food and beverage, and laboratory equipment.

TST128 ships individually. Nominal inside diameter is listed as 1 1/2 inch. Confirm chemical compatibility, pressure and temperature against your own application requirements before installing.