Part number TST381 is an AS568-381 white PTFE (Teflon) 55 Shore D Back-Up Ring supplied with an inside diameter of 11.975 in (304.17 mm), a cross section of 0.21 in (5.33 mm), and an outside diameter of 12.395 in (314.83 mm). A back-up ring bridges the extrusion gap so the primary seal holds its shape under load.
The compound resists strong acids and bases, nearly all industrial chemicals, and oxidizing media. PTFE (Teflon) delivers excellent dielectric properties and a very wide continuous service temperature range. Continuous operating temperature is published at -65°F (-53.9°C) to 500°F (260°C).
Common environments for this compound include food and beverage, chemical processing, and laboratory equipment.
Stocked as TST381 and sold individually. Check the compound against your process media, pressure and temperature before committing to a design.
Description 2103-381 PTFE S/T BUP FDA
Actual Cross Section 0.21 inch (5.33 mm)
Actual Inside Diameter 11.975 inch (304.17 mm)
Actual Outside Diameter 12.395 inch (314.83 mm)
Measurement System Imperial
Product Category O-Rings - Backup Rings