2103-156 PTFE S/T BUP FDA

This back-up ring is supplied in AS568-156 white PTFE (Teflon) 55 Shore D with an inside diameter of 4.237 in (107.62 mm), a cross section of 0.103 in (2.62 mm), and an outside diameter of 4.443 in (112.85 mm), catalogued under part number TST156. It allows a standard o-ring to operate at higher pressures than it could unsupported.

PTFE (Teflon) is known for near-universal chemical inertness and one of the lowest coefficients of friction of any solid. The compound resists strong acids and bases, oxidizing media, and solvents. Published continuous service range is -65°F (-53.9°C) to 500°F (260°C). Verify compatibility before use with elemental fluorine at temperature or molten alkali metals.

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

TST156 ships individually. As always, verify media compatibility and operating conditions against the requirements of your specific application.