APG stocks the TST037, an AS568-037 white PTFE (Teflon) 55 Shore D Back-Up Ring built to an inside diameter of 2.489 in (63.22 mm), a cross section of 0.07 in (1.78 mm), and an outside diameter of 2.629 in (66.78 mm). A back-up ring extends o-ring service life by supporting the seal against extrusion under high pressure.
As a material, PTFE (Teflon) delivers one of the lowest coefficients of friction of any solid and excellent dielectric properties. This material stands up to oxidizing media, steam, and strong acids and bases. Continuous operating temperature is published at -65°F (-53.9°C) to 500°F (260°C). Verify compatibility before use with elemental fluorine at temperature or service requiring elastic recovery.
It sees regular use in semiconductor fabrication, laboratory equipment, and food and beverage.
TST037 ships individually. Nominal inside diameter is listed as 2 1/2 inch. As always, verify media compatibility and operating conditions against the requirements of your specific application.
Description 2103-037 PTFE S/T BUP FDA
Actual Cross Section 0.07 inch (1.78 mm)
Actual Inside Diameter 2.489 inch (63.22 mm)
Actual Outside Diameter 2.629 inch (66.78 mm)
Measurement System Imperial
Product Category O-Rings - Backup Rings