FKM O-Rings - 70 Shore A

What is an O-ring FKM - 70 Shore A

An O-ring FKM - 70 Shore A, also known as a Viton O-ring, is a high-quality sealing ring made of fluoroelastomer (FKM) with a hardness of 70 Shore A. This specific type of O-ring is designed to offer an excellent balance between flexibility and durability. FKM is a synthetic rubber known for its exceptional resistance to high temperatures and various chemicals.

With a temperature range of -15 °C to +200 °C, and even down to -50 °C in special grades, an O-ring FKM - 70 Shore A is suitable for use in extreme environments. They are often used to prevent leaks of liquids or gases in various industrial and mechanical applications.

Properties of FKM O-rings in 70 Shore A

The O-ring FKM - 70 Shore A has several distinctive properties that make it ideal for demanding applications. Firstly, it offers excellent temperature resistance, ranging from -15 °C to +200 °C, and with special grades, it can even withstand temperatures down to -50 °C. This makes the FKM O-ring suitable for use in environments with extreme heat and cold.

Additionally, an O-ring FKM - 70 Shore A has high resistance to a wide range of chemicals, including mineral oil-based oils and greases, aliphatic and aromatic hydrocarbons, chlorinated hydrocarbons, HFD pressure fluids, silicone oils and greases, non-polar solvents, vegetable and animal oils and fats, motor fuels, ozone, weather conditions, and aging. This chemical resistance ensures that the O-ring maintains its integrity in various environments and applications.

The advantages of an FKM O-ring in 70 Shore A

Using an O-ring FKM - 70 Shore A offers several advantages that contribute to its popularity in industrial applications. One of the biggest advantages is its exceptional temperature resistance, allowing it to function effectively at both very high and low temperatures. This makes it suitable for a wide range of environments, from automotive engines to aerospace equipment.

Additionally, the O-ring FKM - 70 Shore A offers excellent chemical resistance against a wide range of substances, including mineral oils, hydrocarbons, and various solvents. This versatility makes it a reliable choice for sealing in many industrial processes. Moreover, the FKM O-ring has high resistance to ozone, weather conditions, and aging, meaning it lasts a long time without losing quality, even when exposed to harsh environmental factors.

Applications of a 70 Shore A FKM O-ring

The O-ring FKM - 70 Shore A is used in a wide range of applications due to its robust properties. In the automotive industry, they are often used in engines, fuel systems, and transmissions, where their temperature resistance and chemical resistance are crucial. In the aerospace industry, these O-rings are used in fuel systems and hydraulic systems, where reliability under extreme conditions is essential.

The chemical industry uses FKM O-rings in equipment that comes into contact with aggressive chemicals and solvents, where the chemical resistance of FKM is indispensable. Additionally, FKM O-rings are used in the food and beverage industry, especially in places where equipment needs to be sealed against vegetable and animal fats. Their resistance to ozone and aging also makes them suitable for outdoor use, such as in agricultural equipment and construction machinery.

Disadvantages of an O-ring FKM - 70 Shore A

Although the O-ring FKM - 70 Shore A offers many advantages, there are also some disadvantages to consider. One major drawback is that it is not resistant to polar solvents, which limits its use in certain chemical environments. For applications where resistance to polar solvents is crucial, such as boiler systems or chemical processing equipment, FFKM (Perfluoroelastomer) O-rings may be a better choice due to their excellent chemical resistance.

Additionally, the O-ring is not suitable for use in hot water and overheated steam, making it less suitable for some industrial applications where high temperatures of water or steam play a role. For such applications, EPDM (Ethylene Propylene Diene Monomer) O-rings are often more suitable due to their excellent heat resistance and steam resistance.

Low molecular weight acids and glycol-based brake fluids are also harmful to the O-ring FKM - 70 Shore A, preventing it from being used in systems that work with these fluids. FFKM (Perfluoroelastomer) O-rings, on the other hand, offer superior chemical resistance and can withstand a wide range of acids, bases, and solvents, including glycol-based brake fluids.

Finally, the O-ring is sensitive to degradation by amines and alkalis, further limiting its applicability in certain chemical environments. Aflas (TFE/P) O-rings combine the chemical resistance of FKM with excellent resistance to amines and alkalis, making them suitable for demanding chemical environments.

Despite these drawbacks, the FKM O-ring remains an excellent choice for many applications due to its versatile and robust properties.