258 PTFE SOLID BACKUP RING FDA

Part number TST258SO is an AS568-258 white PTFE (Teflon) 55 Shore D Back-Up Ring supplied with an inside diameter of 5.984 in (151.99 mm), a cross section of 0.139 in (3.53 mm), and an outside diameter of 6.262 in (159.05 mm). A back-up ring extends o-ring service life by supporting the seal against extrusion under high pressure.

As a material, PTFE (Teflon) is specified for a very wide continuous service temperature range and non-stick, non-contaminating surface characteristics. The compound resists oxidizing media, steam, and nearly all industrial chemicals. The material carries a published service range of -65°F (-53.9°C) to 500°F (260°C). Verify compatibility before use with elemental fluorine at temperature or service requiring elastic recovery.

Maintenance and OEM teams specify it across food and beverage, semiconductor fabrication, and laboratory equipment.

Stocked as TST258SO and sold individually. Nominal inside diameter is listed as 6 inch. Check the compound against your process media, pressure and temperature before committing to a design.