This back-up ring is supplied in AS568-445 white PTFE (Teflon) 55 Shore D with an inside diameter of 7.975 in (202.57 mm), a cross section of 0.275 in (6.99 mm), and an outside diameter of 8.525 in (216.54 mm), catalogued under part number TSP445. It extends o-ring service life by supporting the seal against extrusion under high pressure.
It resists oxidizing media, strong acids and bases, and solvents. PTFE (Teflon) is known for near-universal chemical inertness and non-stick, non-contaminating surface characteristics. Published continuous service range is -65°F (-53.9°C) to 500°F (260°C). It is not the right choice where elemental fluorine at temperature or molten alkali metals are present.
It sees regular use in aggressive-media pipelines, chemical processing, and laboratory equipment.
Reference part number TSP445 when ordering; the item is sold individually. Nominal inside diameter is listed as 8 inch. Review your operating media and conditions against this specification before installation.
Description *2107-445 PTFE SPIRAL B/U FDA
Actual Cross Section 0.275 inch (6.99 mm)
Actual Inside Diameter 7.975 inch (202.57 mm)
Actual Outside Diameter 8.525 inch (216.54 mm)
Measurement System Imperial
Product Category O-Rings - Backup Rings