247 PTFE SOLID BACKUP RING FDA

Ordered as TST247SO, this is an AS568-247 white PTFE (Teflon) 55 Shore D Back-Up Ring supplied with an inside diameter of 4.609 in (117.07 mm), a cross section of 0.139 in (3.53 mm), and an outside diameter of 4.887 in (124.13 mm). The back-up ring extends o-ring service life by supporting the seal against extrusion under high pressure.

The material holds up against strong acids and bases, solvents, and oxidizing media. PTFE (Teflon) offers excellent dielectric properties and near-universal chemical inertness. Rated temperature range runs from -65°F (-53.9°C) to 500°F (260°C) in continuous service. Applications involving molten alkali metals or service requiring elastic recovery call for a different compound.

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

Reference part number TST247SO when ordering; the item is sold individually. Nominal inside diameter is listed as 4 5/8 inch. Check the compound against your process media, pressure and temperature before committing to a design. Not finding the exact configuration you need? APG cross-references from prints, samples and competitor part numbers.