The TST151SO is an AS568-151 white PTFE (Teflon) 55 Shore D Back-Up Ring supplied with an inside diameter of 2.987 in (75.87 mm), a cross section of 0.103 in (2.62 mm), and an outside diameter of 3.193 in (81.1 mm). This back-up ring bridges the extrusion gap so the primary seal holds its shape under load.
The compound resists oxidizing media, steam, and nearly all industrial chemicals. PTFE (Teflon) delivers excellent dielectric properties and non-stick, non-contaminating surface characteristics. 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 chemical processing, pharmaceutical and biotech, and semiconductor fabrication.
Order part number TST151SO, sold individually. Nominal inside diameter is listed as 3 inch. As always, verify media compatibility and operating conditions against the requirements of your specific application.
Description 151 PTFE SOLID BACKUP RING FDA
Actual Cross Section 0.103 inch (2.62 mm)
Actual Inside Diameter 2.987 inch (75.87 mm)
Actual Outside Diameter 3.193 inch (81.1 mm)
Measurement System Imperial
Product Category O-Rings - Backup Rings