This back-up ring is supplied in AS568-027 white PTFE (Teflon) 55 Shore D measuring an inside diameter of 1.301 in (33.05 mm), a cross section of 0.07 in (1.78 mm), and an outside diameter of 1.441 in (36.6 mm), catalogued under part number TSP027. It bridges the extrusion gap so the primary seal holds its shape under load.
Expect good resistance to strong acids and bases, solvents, and steam. PTFE (Teflon) delivers one of the lowest coefficients of friction of any solid and excellent dielectric properties. Service temperature is rated from -65°F (-53.9°C) through 500°F (260°C). Applications involving service requiring elastic recovery or molten alkali metals call for a different compound.
Maintenance and OEM teams specify it across semiconductor fabrication, food and beverage, and pharmaceutical and biotech.
Order part number TSP027, 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 *2107-027 PTFE SPIRAL B/U FDA
Actual Cross Section 0.07 inch (1.78 mm)
Actual Inside Diameter 1.301 inch (33.05 mm)
Actual Outside Diameter 1.441 inch (36.6 mm)
Measurement System Imperial
Product Category O-Rings - Backup Rings