Ordered as TST367SO, this is an AS568-367 white PTFE (Teflon) 55 Shore D Back-Up Ring with an inside diameter of 7.475 in (189.87 mm), a cross section of 0.21 in (5.33 mm), and an outside diameter of 7.895 in (200.53 mm). The back-up ring extends o-ring service life by supporting the seal against extrusion under high pressure.
It resists solvents, oxidizing media, and strong acids and bases. PTFE (Teflon) delivers excellent dielectric properties and non-stick, non-contaminating surface characteristics. Published continuous service range is -65°F (-53.9°C) to 500°F (260°C). Verify compatibility before use with elemental fluorine at temperature or molten alkali metals.
Typical settings include chemical processing, aggressive-media pipelines, and food and beverage.
This item is sold individually under part number TST367SO. Nominal inside diameter is listed as 7 1/2 inch. Application requirements vary, so validate compatibility with your process conditions prior to installation. APG supports cross-referencing from drawings, samples and competitor numbers when a listed size is not an exact fit.
Description 367 PTFE SOLID BACKUP RING FDA
Actual Cross Section 0.21 inch (5.33 mm)
Actual Inside Diameter 7.475 inch (189.87 mm)
Actual Outside Diameter 7.895 inch (200.53 mm)
Measurement System Imperial
Product Category O-Rings - Backup Rings