This back-up ring is supplied in AS568-109 white PTFE (Teflon) 55 Shore D supplied with an inside diameter of 0.299 in (7.59 mm), a cross section of 0.103 in (2.62 mm), and an outside diameter of 0.505 in (12.83 mm), catalogued under part number TST109SO. It allows a standard o-ring to operate at higher pressures than it could unsupported.
PTFE (Teflon) is specified here for near-universal chemical inertness and excellent dielectric properties. This material stands up to steam, nearly all industrial chemicals, and solvents. The material carries a published service range of -65°F (-53.9°C) to 500°F (260°C).
Maintenance and OEM teams specify it across semiconductor fabrication, food and beverage, and laboratory equipment.
Order part number TST109SO, sold individually. Nominal inside diameter is listed as 5/16 inch. Check the compound against your process media, pressure and temperature before committing to a design.
Description *109 PTFE SOLID BACKUP RING FDA
Actual Cross Section 0.103 inch (2.62 mm)
Actual Inside Diameter 0.299 inch (7.59 mm)
Actual Outside Diameter 0.505 inch (12.83 mm)
Measurement System Imperial
Product Category O-Rings - Backup Rings