TST031SO is an AS568-031 white PTFE (Teflon) 55 Shore D Back-Up Ring built to an inside diameter of 1.739 in (44.17 mm), a cross section of 0.07 in (1.78 mm), and an outside diameter of 1.879 in (47.73 mm). In service, this back-up ring bridges the extrusion gap so the primary seal holds its shape under load.
The compound resists solvents, oxidizing media, and nearly all industrial chemicals. PTFE (Teflon) delivers a very wide continuous service temperature range and excellent dielectric properties. Service temperature is rated from -65°F (-53.9°C) through 500°F (260°C). Exposure to molten alkali metals or service requiring elastic recovery will shorten service life.
You will find this material specified across pharmaceutical and biotech, aggressive-media pipelines, and laboratory equipment.
Order part number TST031SO, sold individually. Nominal inside diameter is listed as 1 3/4 inch. Application requirements vary, so validate compatibility with your process conditions prior to installation. Not finding the exact configuration you need? APG cross-references from prints, samples and competitor part numbers.
Description 31 PTFE SOLID BACKUP RING FDA
Actual Cross Section 0.07 inch (1.78 mm)
Actual Inside Diameter 1.739 inch (44.17 mm)
Actual Outside Diameter 1.879 inch (47.73 mm)
Measurement System Imperial
Product Category O-Rings - Backup Rings