TSP121 is an AS568-121 white PTFE (Teflon) 55 Shore D Back-Up Ring supplied with an inside diameter of 1.049 in (26.64 mm), a cross section of 0.103 in (2.62 mm), and an outside diameter of 1.255 in (31.88 mm). In service, this back-up ring allows a standard o-ring to operate at higher pressures than it could unsupported.
PTFE (Teflon) is specified here for near-universal chemical inertness and one of the lowest coefficients of friction of any solid. The compound resists steam, oxidizing media, and solvents. Continuous operating temperature is published at -65°F (-53.9°C) to 500°F (260°C). It should not be specified for service in elemental fluorine at temperature or molten alkali metals.
Typical settings include aggressive-media pipelines, laboratory equipment, and chemical processing.
Order part number TSP121, 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 *2107-121 PTFE SPIRAL B/U FDA
Actual Cross Section 0.103 inch (2.62 mm)
Actual Inside Diameter 1.049 inch (26.64 mm)
Actual Outside Diameter 1.255 inch (31.88 mm)
Measurement System Imperial
Product Category O-Rings - Backup Rings