Ordered as TST008SO, this is an AS568-008 white PTFE (Teflon) 55 Shore D Back-Up Ring supplied with an inside diameter of 0.176 in (4.47 mm), a cross section of 0.07 in (1.78 mm), and an outside diameter of 0.316 in (8.03 mm). The back-up ring bridges the extrusion gap so the primary seal holds its shape under load.
The material holds up against strong acids and bases, steam, and nearly all industrial chemicals. PTFE (Teflon) is widely chosen for excellent dielectric properties and a very wide continuous service temperature range. 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.
It sees regular use in pharmaceutical and biotech, food and beverage, and chemical processing.
This item is sold individually under part number TST008SO. Nominal inside diameter is listed as 3/16 inch. Confirm chemical compatibility, pressure and temperature against your own application requirements before installing.
Description 008 PTFE SOLID BACKUP RING FDA
Actual Cross Section 0.07 inch (1.78 mm)
Actual Inside Diameter 0.176 inch (4.47 mm)
Actual Outside Diameter 0.316 inch (8.03 mm)
Measurement System Imperial
Product Category O-Rings - Backup Rings