*322 PTFE SOLID BACKUP RING FDA

Ordered as TST322SO, this is an AS568-322 white PTFE (Teflon) 55 Shore D Back-Up Ring measuring an inside diameter of 1.225 in (31.12 mm), a cross section of 0.21 in (5.33 mm), and an outside diameter of 1.645 in (41.78 mm). The back-up ring allows a standard o-ring to operate at higher pressures than it could unsupported.

It resists steam, nearly all industrial chemicals, and strong acids and bases. That behavior comes from the compound itself: PTFE (Teflon) is specified for excellent dielectric properties and non-stick, non-contaminating surface characteristics. Service temperature is rated from -65°F (-53.9°C) through 500°F (260°C). Verify compatibility before use with service requiring elastic recovery or molten alkali metals.

It sees regular use in laboratory equipment, pharmaceutical and biotech, and aggressive-media pipelines.

Reference part number TST322SO when ordering; the item is sold individually. Nominal inside diameter is listed as 1 1/4 inch. Review your operating media and conditions against this specification before installation.