The TST164SO is an AS568-164 white PTFE (Teflon) 55 Shore D Back-Up Ring built to an inside diameter of 6.237 in (158.42 mm), a cross section of 0.103 in (2.62 mm), and an outside diameter of 6.443 in (163.65 mm). This back-up ring extends o-ring service life by supporting the seal against extrusion under high pressure.
As a material, PTFE (Teflon) is specified for one of the lowest coefficients of friction of any solid and near-universal chemical inertness. This material stands up to steam, oxidizing media, and strong acids and bases. Service temperature is rated from -65°F (-53.9°C) through 500°F (260°C). Verify compatibility before use with molten alkali metals or elemental fluorine at temperature.
Common environments for this compound include food and beverage, chemical processing, and pharmaceutical and biotech.
Stocked as TST164SO and sold individually. Review your operating media and conditions against this specification before installation. If you need a size, durometer or compound that is not listed, APG can cross-reference from a print, a sample or a competitor part number.
Description 164 PTFE SOLID BACKUP RING FDA
Actual Cross Section 0.103 inch (2.62 mm)
Actual Inside Diameter 6.237 inch (158.42 mm)
Actual Outside Diameter 6.443 inch (163.65 mm)
Measurement System Imperial
Product Category O-Rings - Backup Rings