-386 BLACK FKM 70D SQUARE RING

Part number SV70386 is an AS568-386 black Viton® (FKM) 70 Shore A Square-Cut Ring measuring an inside diameter of 16.955 in (430.66 mm), a cross section of 0.21 in (5.33 mm), and an outside diameter of 17.375 in (441.33 mm). A square-cut ring seals with a broad flat contact band instead of the line contact of a round-section ring.

This material stands up to chlorinated solvents, engine and transmission fluids, and aggressive chemicals. That behavior comes from the compound itself: Viton® (FKM) is known for outstanding high-temperature capability, excellent resistance to compression set and permeation. Rated temperature range runs from -15°F (-26.1°C) to 400°F (204.4°C) in continuous service. Applications involving low-molecular-weight organic acids or amines call for a different compound. The profile itself contributes a rectangular section that will not roll in the groove and greater resistance to extrusion than a round section of the same size. Note that a square section is less suited to high-speed rotary service, where the larger contact area raises friction and heat.

It sees regular use in oil and gas, high-temperature process equipment, and semiconductor equipment.

Stocked as SV70386 and sold individually. Check the compound against your process media, pressure and temperature before committing to a design.