*219 PTFE SOLID BACKUP RING FDA

Part number TST219SO is an AS568-219 white PTFE (Teflon) 55 Shore D Back-Up Ring supplied with an inside diameter of 1.296 in (32.92 mm), a cross section of 0.139 in (3.53 mm), and an outside diameter of 1.574 in (39.98 mm). A back-up ring allows a standard o-ring to operate at higher pressures than it could unsupported.

The material holds up against steam, oxidizing media, and nearly all industrial chemicals. PTFE (Teflon) is widely chosen for a very wide continuous service temperature range and non-stick, non-contaminating surface characteristics. Continuous operating temperature is published at -65°F (-53.9°C) to 500°F (260°C). Applications involving elemental fluorine at temperature or service requiring elastic recovery call for a different compound.

Typical settings include chemical processing, food and beverage, and laboratory equipment.

Order part number TST219SO, sold individually. As always, verify media compatibility and operating conditions against the requirements of your specific application. APG supports cross-referencing from drawings, samples and competitor numbers when a listed size is not an exact fit.