2103-049 PTFE S/T BUP FDA

TST049 is an AS568-049 white PTFE (Teflon) 55 Shore D Back-Up Ring with an inside diameter of 4.989 in (126.72 mm), a cross section of 0.07 in (1.78 mm), and an outside diameter of 5.129 in (130.28 mm). In service, this back-up ring extends o-ring service life by supporting the seal against extrusion under high pressure.

As a material, PTFE (Teflon) is widely chosen for a very wide continuous service temperature range and excellent dielectric properties. The material holds up against oxidizing media, steam, and nearly all industrial chemicals. Rated temperature range runs from -65°F (-53.9°C) to 500°F (260°C) in continuous service. Exposure to service requiring elastic recovery or elemental fluorine at temperature will shorten service life.

You will find this material specified across food and beverage, chemical processing, and aggressive-media pipelines.

This item is sold individually under part number TST049. Nominal inside diameter is listed as 5 inch. Check the compound against your process media, pressure and temperature before committing to a design. For a size or compound outside the standard catalog, APG can quote from a print or sample.