• Made of Viton/fkm (fluorocarbon elastomer) for use with a variety of chemicals and fuels
• Durometer (hardness) of 90A
• Round cross-section provides a seal between cylindrical overlapping surfaces
• For use across a wide temperature range from -15 degrees F (-26 degrees C) to 450 degrees F (232 degrees C)
• Meets standards defined by Aerospace Standard AS568A

Size:394 | Nominal Inside Diameter:24.940 Inches | Nominal Outside
Diameter:25-3/8 Inches | Nominal Width:0.210 Inches | Inside Diameter
String:24.940 Inches | Outside Diameter:25.360 Inches | Item Width
String:0.210 inches | Number of Items:1 This O-ring is made of black Viton and
has a durometer of 90A, a round cross-section, and can be used across a wide
temperature range (-15 degrees F /-26 degrees C to 450 degrees F/ 232 degrees
C). Designed for use in a wide variety of sealing applications, this Viton
O-ring meets standards defined by Aerospace Standard AS568A, which is the
Aerospace Size Standard for O-rings. Viton (fluorocarbon elastomer) has heat,
fuel, and chemical resistance and is compatible for use with non-flammable
hydraulic fuels, silicone oil, chlorinated hydrocarbons (trichloroethylene),
fuels, aromatic hydrocarbons (benzene) and aliphatic hydrocarbons (propane),
as well as high vacuum environments, ozone, and weathering. Viton is
vulnerable to low molecular organic acids, ammonia gas, alkalis, amines,
glycol-based brake fluids, and super-heated steam. The durometer hardness of
this Viton O-ring is 90A. Durometers measure the hardness of a material and
its resistance to permanent indentation. A higher durometer value indicates
greater resistance to indentation. On a scale of 0 to 100, a value of 0
indicates that a sample was completely penetrated, while a value of 100 shows
no indentation in the sample. The letter following the number identifies the
shore scale, which is either shore A or D. Shore A is used for softer
plastics, while shore D is used for harder plastics. O-rings provide a
pressure and fluid seal between cylindrically shaped, overlapping mating
surfaces and are commonly seen in engines, faucets, flanges, valves, and
various cylinders. They are circular in shape, with a round cross section, and
a hole in the center, similar to a doughnut. O-rings are available in various
AS568A dash sizes, which is the standardized sizing for O-rings, and defines
the nominal inside diameter (ID), outer diameter (OD), and cross-sectional
(CS) diameter of an O-ring.