O-rings are a common sealing solution in various industrial and commercial applications. They are made of different materials to suit different operating conditions, such as temperature, pressure, and chemical exposure. This article will discuss some of the common O-ring materials available.
Nitrile (NBR)- Nitrile is a popular O-ring material due to its excellent resistance to oil, fuel, and other petroleum-based fluids. It can withstand a temperature range of -40°C to +120°C and has good tensile strength and tear resistance. However, it is generally not recommended for use in applications where it will come into contact with ketones, ozone, or nitro hydrocarbons.
Fluorocarbon (FKM)- Fluorocarbon, also known as Viton®, is an O-ring material with excellent chemical resistance to various fluids, including acids, fuels, and oils. It can withstand a temperature range of -20°C to +200°C and has good resistance to compression set. It is, however, relatively expensive compared to other materials and has poor resistance to ketones and steam.
Silicone (VMQ)- Silicone O-rings are known for their high-temperature resistance, making them ideal for applications where extreme heat is expected. They can withstand a temperature range of -50°C to +230°C and have excellent electrical insulation properties. However, they have poor resistance to oils and fuels, making them unsuitable for use in such environments.
Ethylene Propylene Diene Monomer (EPDM)- EPDM O-rings have excellent resistance to weathering, ozone, and UV light, making them suitable for outdoor applications. They can withstand a temperature range of -50°C to +150°C and have good chemical resistance to acids, ketones, and alkalis. However, they are not recommended for use in applications that involve exposure to oils or fuels.
Neoprene (CR)- Neoprene O-rings have excellent resistance to weathering, ozone, and UV light, making them suitable for outdoor applications. They can withstand a temperature range of -35°C to +120°C and have good resistance to oils, fuels, and chemicals. However, they have poor resistance to ketones and acids.
Selecting the right O-ring material for your application is crucial to ensuring proper sealing and longevity of the component. Factors such as temperature, pressure, chemical exposure, and fluid type must be considered when choosing an O-ring material. The materials discussed above are just a few of the many options available in the market, and consulting with a specialist is recommended to ensure the best material is selected for your application.
We have many different types of O-Rings to fit your needs. For more information, visit our O-Ring page.