Ordered as TST236, this is an AS568-236 white PTFE (Teflon) 55 Shore D Back-Up Ring with an inside diameter of 3.234 in (82.14 mm), a cross section of 0.139 in (3.53 mm), and an outside diameter of 3.512 in (89.2 mm). The back-up ring extends o-ring service life by supporting the seal against extrusion under high pressure.
This material stands up to oxidizing media, solvents, and strong acids and bases. PTFE (Teflon) is specified for non-stick, non-contaminating surface characteristics and one of the lowest coefficients of friction of any solid. Rated temperature range runs from -65°F (-53.9°C) to 500°F (260°C) in continuous service.
It sees regular use in semiconductor fabrication, food and beverage, and pharmaceutical and biotech.
Order part number TST236, sold individually. As always, verify media compatibility and operating conditions against the requirements of your specific application. Not finding the exact configuration you need? APG cross-references from prints, samples and competitor part numbers.
Description 2103-236 PTFE S/T BUP FDA
Actual Cross Section 0.139 inch (3.53 mm)
Actual Inside Diameter 3.234 inch (82.14 mm)
Actual Outside Diameter 3.512 inch (89.2 mm)
Measurement System Imperial
Product Category O-Rings - Backup Rings