568-209 FKM 75 SQUARE CUT RINGS

This square-cut ring is supplied in AS568-209 black Viton® (FKM) 70 Shore A built to an inside diameter of 0.671 in (17.04 mm), a cross section of 0.139 in (3.53 mm), and an outside diameter of 0.949 in (24.1 mm), catalogued under part number SV70209. It presents a flat rectangular section that cannot roll or twist in its groove, making it a dependable static seal.

The material holds up against aromatic hydrocarbons, many acids, and petroleum oils and fuels. That behavior comes from the compound itself: Viton® (FKM) offers excellent resistance to compression set and permeation, the industry benchmark where nitrile reaches its thermal limit. Rated temperature range runs from -15°F (-26.1°C) to 400°F (204.4°C) in continuous service. Verify compatibility before use with low-molecular-weight organic acids or ketones and esters. The profile itself contributes a flat contact band that spreads sealing load across a wider area and a rectangular section that will not roll in the groove. Note that a square section is less suited to high-speed rotary service, where the larger contact area raises friction and heat.

You will find this material specified across chemical processing, oil and gas, and aerospace.

Order part number SV70209, sold individually. As always, verify media compatibility and operating conditions against the requirements of your specific application.