Ordered as TST211SO, this is an AS568-211 white PTFE (Teflon) 55 Shore D Back-Up Ring supplied with an inside diameter of 0.796 in (20.22 mm), a cross section of 0.139 in (3.53 mm), and an outside diameter of 1.074 in (27.28 mm). The back-up ring extends o-ring service life by supporting the seal against extrusion under high pressure.
Expect good resistance to oxidizing media, nearly all industrial chemicals, and strong acids and bases. That behavior comes from the compound itself: PTFE (Teflon) is valued for near-universal chemical inertness and non-stick, non-contaminating surface characteristics. Service temperature is rated from -65°F (-53.9°C) through 500°F (260°C). Verify compatibility before use with service requiring elastic recovery or molten alkali metals.
You will find this material specified across food and beverage, aggressive-media pipelines, and laboratory equipment.
TST211SO ships individually. Check the compound against your process media, pressure and temperature before committing to a design.
Description *211 PTFE SOLID BACKUP RING FDA
Actual Cross Section 0.139 inch (3.53 mm)
Actual Inside Diameter 0.796 inch (20.22 mm)
Actual Outside Diameter 1.074 inch (27.28 mm)
Measurement System Imperial
Product Category O-Rings - Backup Rings