Part number TSP220 is an AS568-220 white PTFE (Teflon) 55 Shore D Back-Up Ring with an inside diameter of 1.359 in (34.52 mm), a cross section of 0.139 in (3.53 mm), and an outside diameter of 1.637 in (41.58 mm). A back-up ring bridges the extrusion gap so the primary seal holds its shape under load.
PTFE (Teflon) is specified here for one of the lowest coefficients of friction of any solid and non-stick, non-contaminating surface characteristics. This material stands up to oxidizing media, strong acids and bases, and solvents. Continuous operating temperature is published at -65°F (-53.9°C) to 500°F (260°C).
Typical settings include pharmaceutical and biotech, food and beverage, and chemical processing.
Order part number TSP220, sold individually. Nominal inside diameter is listed as 1 3/8 inch. Confirm chemical compatibility, pressure and temperature against your own application requirements before installing. For a size or compound outside the standard catalog, APG can quote from a print or sample.
Description 2107-220 PTFE SPIRAL B/U FDA
Actual Cross Section 0.139 inch (3.53 mm)
Actual Inside Diameter 1.359 inch (34.52 mm)
Actual Outside Diameter 1.637 inch (41.58 mm)
Measurement System Imperial
Product Category O-Rings - Backup Rings