Q-388 FLUOROELASTOMER 75 Q RING

Part number QV70388 is an AS568-388 black Viton® (FKM) 75 Shore A Quad-Ring built to an inside diameter of 18.953 in (481.41 mm), a cross section of 0.21 in (5.33 mm), and an outside diameter of 19.373 in (492.07 mm). A quad-ring delivers lower friction and better sealing stability than a comparable round-section o-ring.

This material stands up to many acids, aromatic hydrocarbons, and engine and transmission fluids. That behavior comes from the compound itself: Viton® (FKM) is widely chosen for outstanding high-temperature capability and long service life in hot, chemically aggressive environments. The material carries a published service range of -15°F (-26.1°C) to 400°F (204.4°C). Applications involving low-molecular-weight organic acids or amines call for a different compound. The profile itself contributes resistance to the spiral twisting that defeats round-section rings and two sealing bands per contact face rather than one.

Common environments for this compound include automotive fuel systems, semiconductor equipment, and high-temperature process equipment.

Reference part number QV70388 when ordering; the item is sold individually. Nominal inside diameter is listed as 19 inch. Confirm chemical compatibility, pressure and temperature against your own application requirements before installing. APG supports cross-referencing from drawings, samples and competitor numbers when a listed size is not an exact fit.