TST202SO is an AS568-202 white PTFE (Teflon) 55 Shore D Back-Up Ring measuring an inside diameter of 0.234 in (5.94 mm), a cross section of 0.139 in (3.53 mm), and an outside diameter of 0.512 in (13 mm). In service, this back-up ring extends o-ring service life by supporting the seal against extrusion under high pressure.
It resists steam, nearly all industrial chemicals, and strong acids and bases. That behavior comes from the compound itself: PTFE (Teflon) delivers one of the lowest coefficients of friction of any solid and excellent dielectric properties. Rated temperature range runs from -65°F (-53.9°C) to 500°F (260°C) in continuous service. It is not the right choice where molten alkali metals or elemental fluorine at temperature are present.
You will find this material specified across food and beverage, pharmaceutical and biotech, and aggressive-media pipelines.
Stocked as TST202SO and sold individually. Application requirements vary, so validate compatibility with your process conditions prior to installation.
Description 202 PTFE SOLID BACKUP RING FDA
Actual Cross Section 0.139 inch (3.53 mm)
Actual Inside Diameter 0.234 inch (5.94 mm)
Actual Outside Diameter 0.512 inch (13 mm)
Measurement System Imperial
Product Category O-Rings - Backup Rings