This back-up ring is supplied in AS568-178 white PTFE (Teflon) 55 Shore D supplied with an inside diameter of 9.737 in (247.32 mm), a cross section of 0.103 in (2.62 mm), and an outside diameter of 9.943 in (252.55 mm), catalogued under part number TST178SO. It extends o-ring service life by supporting the seal against extrusion under high pressure.
As a material, PTFE (Teflon) is widely chosen for a very wide continuous service temperature range and near-universal chemical inertness. This material stands up to oxidizing media, nearly all industrial chemicals, and strong acids and bases. Rated temperature range runs from -65°F (-53.9°C) to 500°F (260°C) in continuous service.
It sees regular use in laboratory equipment, aggressive-media pipelines, and pharmaceutical and biotech.
Stocked as TST178SO and sold individually. Nominal inside diameter is listed as 9 3/4 inch. Review your operating media and conditions against this specification before installation. APG supports cross-referencing from drawings, samples and competitor numbers when a listed size is not an exact fit.
Description 178 PTFE SOLID BACKUP RING FDA
Actual Cross Section 0.103 inch (2.62 mm)
Actual Inside Diameter 9.737 inch (247.32 mm)
Actual Outside Diameter 9.943 inch (252.55 mm)
Measurement System Imperial
Product Category O-Rings - Backup Rings