This back-up ring is supplied in AS568-028 white PTFE (Teflon) 55 Shore D measuring an inside diameter of 1.364 in (34.65 mm), a cross section of 0.07 in (1.78 mm), and an outside diameter of 1.504 in (38.2 mm), catalogued under part number TST028SO. It 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 excellent dielectric properties. The compound resists nearly all industrial chemicals, oxidizing media, and steam. Service temperature is rated from -65°F (-53.9°C) through 500°F (260°C). Exposure to service requiring elastic recovery or elemental fluorine at temperature will shorten service life.
It sees regular use in pharmaceutical and biotech, chemical processing, and semiconductor fabrication.
This item is sold individually under part number TST028SO. Review your operating media and conditions against this specification before installation. APG supports cross-referencing from drawings, samples and competitor numbers when a listed size is not an exact fit.
Description *MS27595-028 TEFLON SOLID BACKUP FDA
Actual Cross Section 0.07 inch (1.78 mm)
Actual Inside Diameter 1.364 inch (34.65 mm)
Actual Outside Diameter 1.504 inch (38.2 mm)
Measurement System Imperial
Product Category O-Rings - Backup Rings