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Lip Seal, Square Profile, Buna-N O-Ring Loaded, Urethane

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Product Specifications
Item Shape
Material Type
Color Name
Brand Name
Small Parts
Upper Temperature Range
200  Degrees Fahrenheit
92 A Durometer
Maximum Pressure
5000  PSI
LowerTemperature Range
-40  Degrees Fahrenheit
System of Measurement

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Key Features

  • Loaded lip seal for providing a hydraulic-cylinder seal under pressures up to 5,000 pounds per square inch (psi)
  • Square profile to provide a static seal
  • Lip seal made from urethane for flexibility and resistance to impact, abrasion, and hydrocarbons
  • O-ring made of Buna-nitrile (also called Buna-N) for use with a variety of fluids from petroleum to aliphatic hydrocarbons
  • Functions in temperatures from - 40 to 200 degrees F and has a durometer of 92A

Product Description

This loaded lip seal has a square profile, is made of black urethane, has a black Buna-nitrile (Buna-N) O-ring, provides a seal under pressures up to 5,000 pounds per square inch (psi), functions in temperatures from – 40 to 200 degrees F and has a durometer of 92A.

Urethane is a lightweight plastic with impact, abrasion, weather, electrical, and hydrocarbon resistance. It is available in different levels of hardness depending on the application, and performs well up to about 90 degrees C (194 F). Buna-nitrile can have high tensile strength, and has abrasion, tear, and compression set resistance. It is compatible for use with petroleum, hexafluoroacetone (HFA), hexafluoro-2-butyne (HFB) and hydrofluorocarbon (HFC) fluids, vegetable oil, alcohol, acids, and aliphatic hydrocarbons. Buna-nitrile is vulnerable to acetone, ethers, esters, ozone, sunlight and weathering, and should not be used in ozone-generating electric motors, welding equipment, or in applications with exposure to UV light.

The durometer hardness of this lip seal is 92A. 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.

Square profile lip seals, also known as polypacks, provide a pressure and fluid seal for rod and piston seals in low pressure hydraulic applications. They are circular in shape, with a square cross section for providing a static seal under high pressure, and a u-shaped indentation for holding an O-ring (which helps alleviate pressure on the inner and outer diameter seal surface and to prevent leakage in dynamic applications at lower pressures). 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. Lip seals are available in different heights, widths, and with different inside and outer diameters

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