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U-Cup Seal, Buna-N, 1/4" Height, 1/2" ID, 1" OD (Pack of 5)
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About U-Cup Seal, Buna-N, 1/4" Height, 1/2" ID, 1" OD
This U-cup seal is made of black Buna-nitrile (Buna-N), has a durometer of 70A, a U-shaped cross-section, and can be used across temperature range -30 degrees F/-34 degrees C to 250 degrees F/121 degrees C. It is commonly used in a wide variety of sealing applications, as it provides a seal between cylindrical overlapping surfaces and has a maximum pressure of 300 PSI. Buna-nitrile can have high tensile strength, as well as abrasion, tearing, 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 Buna U-cup is 70A. 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. U-cups 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 have a U-shaped cross-section, with flared lips that contact both sides of the walls of a cylinder, and create a seal on both the inner and outer diameter.
