*470 PTFE SOLID BACKUP RING FDA

This back-up ring is supplied in AS568-470 white PTFE (Teflon) 55 Shore D measuring an inside diameter of 20.955 in (532.26 mm), a cross section of 0.275 in (6.99 mm), and an outside diameter of 21.505 in (546.23 mm), catalogued under part number TST470SO. It installs on the low-pressure side of an o-ring to prevent extrusion into the clearance gap at elevated pressure.

PTFE (Teflon) is specified here for very wide continuous service temperature range and excellent dielectric properties. The compound resists oxidizing media, nearly all industrial chemicals, and solvents. The material carries a published service range of -65°F (-53.9°C) to 500°F (260°C). Verify compatibility before use with service requiring elastic recovery or elemental fluorine at temperature.

It sees regular use in semiconductor fabrication, aggressive-media pipelines, and chemical processing.

TST470SO ships individually. Nominal inside diameter is listed as 21 inch. Review your operating media and conditions against this specification before installation. Not finding the exact configuration you need? APG cross-references from prints, samples and competitor part numbers.