*027 TEFLON SOLID BACKUPS FDA

APG stocks the TST027SO, an AS568-027 white PTFE (Teflon) 55 Shore D Back-Up Ring built to an inside diameter of 1.301 in (33.05 mm), a cross section of 0.07 in (1.78 mm), and an outside diameter of 1.441 in (36.6 mm). A back-up ring extends o-ring service life by supporting the seal against extrusion under high pressure.

PTFE (Teflon) is known for non-stick, non-contaminating surface characteristics and near-universal chemical inertness. It resists strong acids and bases, steam, and oxidizing media. Published continuous service range is -65°F (-53.9°C) to 500°F (260°C). Applications involving elemental fluorine at temperature or molten alkali metals call for a different compound.

You will find this material specified across pharmaceutical and biotech, laboratory equipment, and aggressive-media pipelines.

Order part number TST027SO, sold individually. Nominal inside diameter is listed as 1 5/16 inch. As always, verify media compatibility and operating conditions against the requirements of your specific application.