228 Buna-N O-Ring, 70A Durometer, Black, 2-1/4 ID, 2-1/2 OD, 1/8 Width, Pack of 100

This O-ring, crafted from black Buna-nitrile (also known as Buna-N), features a round cross-section and boasts a durometer rating of 70A, making it ideal for a diverse range of sealing applications. Buna-nitrile is renowned for its exceptional properties, including high tensile strength, as well as resistance to abrasion, tears, and compression set.

Operating effectively within a temperature spectrum of -30 degrees Fahrenheit (-34 degrees Celsius) to 250 degrees Fahrenheit (121 degrees Celsius), this material showcases compatibility with various fluids, such as petroleum, HFA, HFB, HFC fluids, alcohol, vegetable oil, acids, and aliphatic hydrocarbons. However, it’s important to note that Buna-nitrile is susceptible to certain substances, notably acetone, ethers, esters, ozone, sunlight, and weathering. Therefore, it is not advisable to use this O-ring in applications such as ozone-generating electric motors, welding equipment, or environments exposed to ultraviolet light.

The shore durometer rating of 70A indicates the hardness of the material and its ability to resist permanent indentation. On a scale from 0 to 100, with 100 representing no indentation, a higher durometer signifies increased resistance to penetration. O-rings play a crucial role in creating pressure and fluid seals between overlapping cylindrical surfaces. They are typically employed in a variety of applications, including engines, flanges, faucets, valves, and various types of cylinders.

These O-rings are designed in a circular shape with a hole in the center, resembling a doughnut. They are available in various sizes and can be customized according to the required nominal inside diameter (ID), outer diameter (OD), and cross-sectional (CS) diameter. Importantly, these Buna-nitrile O-rings adhere to the specifications set forth by the Aerospace Standard AS568A, ensuring their reliability and performance in aerospace applications.

To summarize, the following are key features of this Buna-nitrile O-ring:

1. Material: Constructed from Buna-nitrile, which is suitable for use with a broad range of fluids and hydrocarbons.

2. Temperature Flexibility: Capable of performing within an extensive temperature range, from -30 degrees Fahrenheit (-34 degrees Celsius) to 250 degrees Fahrenheit (121 degrees Celsius).

3. Shape: Carefully designed with a round cross-section to effectively provide a sealing solution between cylindrical overlapping surfaces.

4. Hardness Measurement: A durometer of 70A indicates its robustness and ability to resist penetration, making it a reliable choice for demanding applications.

5. Aerospace Compliance: Fully compliant with the rigorous standards established by Aerospace Standard AS568A, ensuring superior quality and performance.

In conclusion, this O-ring combines durability, a wide range of fluid compatibility, excellent temperature resistance, and adherence to aviation standards, making it an outstanding choice for critical sealing applications across various industries.

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