APG stocks the TSP004, an AS568-004 white PTFE (Teflon) 60 Shore A Back-Up Ring built to an inside diameter of 0.07 in (1.78 mm), a cross section of 0.07 in (1.78 mm), and an outside diameter of 0.21 in (5.33 mm). A back-up ring extends o-ring service life by supporting the seal against extrusion under high pressure.
PTFE (Teflon) is specified here for very wide continuous service temperature range and near-universal chemical inertness. It resists strong acids and bases, oxidizing media, and solvents. Rated temperature range runs from -65°F (-53.9°C) to 500°F (260°C) in continuous service. Verify compatibility before use with molten alkali metals or service requiring elastic recovery.
Typical settings include chemical processing, food and beverage, and pharmaceutical and biotech.
TSP004 ships individually. Nominal inside diameter is listed as 5/64 inch. Check the compound against your process media, pressure and temperature before committing to a design.
Description **2107-004 PTFE SPIRAL B/U FDA
Actual Cross Section 0.07 inch (1.78 mm)
Actual Inside Diameter 0.07 inch (1.78 mm)
Actual Outside Diameter 0.21 inch (5.33 mm)
Measurement System Imperial
Product Category O-Rings - Backup Rings