O-type sealing ring materials and applications
Sealing rings may seem very small in machinery, but they play a very important role in certain situations, especially in pneumatic and hydraulic systems. Different situations require different materials that can meet various properties such as heat resistance, oil resistance, and chemical resistance, and also need to be combined with the elastic hardness of rubber. Here, let's focus on the following four types of sealing materials.
Its application scenarios include auto parts, pumps and valves, hydraulic systems, pneumatic cylinders, construction machinery, aerial work machinery, mining machinery, and automation engineering.
Nitrile rubber (NBR) is an elastomer synthesized from acrylonitrile and butadiene, which has excellent resistance to oil and fuel. However, its structure contains carbon carbon double bonds, which are easily corroded by heat, oxygen, ozone, and reinforcing chemicals, making it unsuitable for many pump and valve applications. The working temperature range of nitrile rubber is -40 ° C to+100 ° C (some grades can reach up to 120 ° C), and it performs best in sealed oil-based systems. It is very suitable for static sealing of solenoid valves and pneumatic components, where the movement is very small.
Nitrile rubber (NBR) is an elastomer synthesized from acrylonitrile and butadiene, which has excellent resistance to oil and fuel. However, its structure contains carbon carbon double bonds, which are easily corroded by heat, oxygen, ozone, and reinforcing chemicals, making it unsuitable for many pump and valve applications. The working temperature range of nitrile rubber is -40 ° C to+100 ° C (some grades can reach up to 120 ° C), and it performs best in sealed oil-based systems. It is very suitable for static sealing of solenoid valves and pneumatic components, where the movement is very small.
Ethylene propylene diene monomer (EPDM) is a multifunctional synthetic rubber known for its excellent heat resistance, ozone resistance, UV resistance, and weather resistance. It usually uses peroxide vulcanization to crosslink the rubber, thereby enhancing its strength in high temperatures and outdoor environments. The working temperature range of EPDM rubber is -40 ° C to+150 ° C, which is very suitable for applications involving water, steam, and weak acids. However, EPDM rubber should never be used for oil, fuel, or hydrocarbon substances. If exposed to it, it will swell, soften, and degrade faster than bananas in heat waves. You definitely don't want it to be used for sealing high-performance machinery! During major repairs, you may find yourself peeling it off like tearing off gum stuck to the sole of your shoe, and one thing is for sure - it's not a quick or clean job!
CR Neoprene has good resistance to weather, ozone, ultraviolet radiation, and moderate chemicals. It uses peroxide vulcanization to make it durable in static sealing applications. The working temperature range of chloroprene rubber is -40 ° C to+120 ° C, making it ideal for mild chemicals and outdoor use. However, it performs poorly in pumps or valves. When exposed to oil, fuel, or high temperatures, it will expand, soften, and degrade. It has weak resistance to wear and tear, making it unsuitable for dynamic environments. But it performs well in electrical enclosures, making it perfect for gaskets and low-pressure seals - although if used in a pump, you'll end up tearing it off piece by piece like tearing off a stubborn sticker!
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