568-309 FKM 75 SQUARE CUT RINGS

SV70309 is an AS568-309 black Viton® (FKM) 70 Shore A Square-Cut Ring built to an inside diameter of 0.412 in (10.46 mm), a cross section of 0.21 in (5.33 mm), and an outside diameter of 0.832 in (21.13 mm). In service, this square-cut ring seals with a broad flat contact band instead of the line contact of a round-section ring.

Viton® (FKM) is specified here for outstanding high-temperature capability and long service life in hot, chemically aggressive environments. This material stands up to aromatic hydrocarbons, many acids, and petroleum oils and fuels. The material carries a published service range of -15°F (-26.1°C) to 400°F (204.4°C). It is not the right choice where low-molecular-weight organic acids or ketones and esters are present. 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.

Typical settings include chemical processing, high-temperature process equipment, and semiconductor equipment.

This item is sold individually under part number SV70309. Nominal inside diameter is listed as 7/16 inch. Review your operating media and conditions against this specification before installation. APG can cross-reference from an existing part number, a drawing or a physical sample if this size is not an exact match.