This back-up ring is supplied in AS568-123 white PTFE (Teflon) 55 Shore D built to an inside diameter of 1.174 in (29.82 mm), a cross section of 0.103 in (2.62 mm), and an outside diameter of 1.38 in (35.05 mm), catalogued under part number TSP123. It bridges the extrusion gap so the primary seal holds its shape under load.
Expect good resistance to strong acids and bases, oxidizing media, and solvents. PTFE (Teflon) offers one of the lowest coefficients of friction of any solid and a very wide continuous service temperature range. The material carries a published service range of -65°F (-53.9°C) to 500°F (260°C). It is not the right choice where service requiring elastic recovery or elemental fluorine at temperature are present.
Typical settings include chemical processing, semiconductor fabrication, and pharmaceutical and biotech.
Order part number TSP123, sold individually. Nominal inside diameter is listed as 1 3/16 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.
Description *2107-123 PTFE SPIRAL B/U FDA
Actual Cross Section 0.103 inch (2.62 mm)
Actual Inside Diameter 1.174 inch (29.82 mm)
Actual Outside Diameter 1.38 inch (35.05 mm)
Measurement System Imperial
Product Category O-Rings - Backup Rings