568-043 FKM 75 SQUARE CUT RINGS

This square-cut ring is supplied in AS568-043 black Viton® (FKM) 70 Shore A built to an inside diameter of 3.489 in (88.62 mm), a cross section of 0.07 in (1.78 mm), and an outside diameter of 3.629 in (92.18 mm), catalogued under part number SV70043. It presents a flat rectangular section that cannot roll or twist in its groove, making it a dependable static seal.

As a material, Viton® (FKM) is specified for very low compression set at elevated temperature and outstanding high-temperature capability. Expect good resistance to chlorinated solvents, many acids, and aromatic hydrocarbons. Continuous operating temperature is published at -15°F (-26.1°C) to 400°F (204.4°C). Exposure to low-molecular-weight organic acids or hot water and steam will shorten service life. The profile itself contributes simple lathe-cut manufacture at low tooling cost 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.

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

Stocked as SV70043 and sold individually. Check the compound against your process media, pressure and temperature before committing to a design. For a size or compound outside the standard catalog, APG can quote from a print or sample.