This back-up ring is supplied in AS568-214 white PTFE (Teflon) 55 Shore D with an inside diameter of 0.984 in (24.99 mm), a cross section of 0.139 in (3.53 mm), and an outside diameter of 1.262 in (32.05 mm), catalogued under part number TST214SO. It installs on the low-pressure side of an o-ring to prevent extrusion into the clearance gap at elevated pressure.
The material holds up against solvents, nearly all industrial chemicals, and strong acids and bases. That behavior comes from the compound itself: PTFE (Teflon) is known for non-stick, non-contaminating surface characteristics and near-universal chemical inertness. Published continuous service range is -65°F (-53.9°C) to 500°F (260°C). Verify compatibility before use with service requiring elastic recovery or molten alkali metals.
Maintenance and OEM teams specify it across semiconductor fabrication, pharmaceutical and biotech, and laboratory equipment.
Order part number TST214SO, sold individually. Nominal inside diameter is listed as 1 inch. Review your operating media and conditions against this specification before installation.
Description *214 PTFE SOLID BACKUP RING FDA
Actual Cross Section 0.139 inch (3.53 mm)
Actual Inside Diameter 0.984 inch (24.99 mm)
Actual Outside Diameter 1.262 inch (32.05 mm)
Measurement System Imperial
Product Category O-Rings - Backup Rings