Bearing Bushings: When Plastic Replaces Metal
We're seeing plastic materials used more and more often instead of metal in bearing bushings. There are several reasons for this, and we're going to take a closer look at some of them. We offer several alternatives, such as POM-C, PA6G, PEEK and UHMWPE, all of which have their specific advantages.
Why Choose Plastic Over Metal?
One important factor is that plastic can have a low coefficient of friction. This leads to reduced energy consumption and less wear. In addition, many plastics are more resistant to corrosion than metal, which is an advantage in humid or chemically aggressive environments.
POM-C: Low Friction and High Wear Resistance
POM-C is an excellent choice for bearing bushings that require low friction and high wear resistance. The coefficient of friction is around 0.2-0.3, which is significantly lower than that of metals. The material also has high wear resistance, which provides a long service life.
One of the most important properties of POM-C is its self-lubricating ability. The material contains a small amount of oil that is released during operation, which reduces friction and prevents wear. In some applications, this may mean that external lubrication isn't needed.
PA6G: Heavy Loads and High Stress
PA6G is suitable for bearing bushings that are subjected to heavy loads and high stress. The material has high mechanical strength and good resistance to wear. In addition, PA6G can handle a high combination of pressure and speed.
To ensure proper function under heavy loads, proper design is important. Bearing bushings in PA6G must have sufficient thickness and diameter to withstand the forces acting on them. The material must also be of high quality and have a uniform structure to prevent cracking.
PEEK: Extreme Conditions and High Temperature
PEEK is a material that can withstand extreme conditions, such as high temperature, chemicals and radiation. It has high chemical resistance and good mechanical strength, even at high temperatures. In addition, PEEK has a high PV limit and a low coefficient of friction.
PEEK is very resistant to most chemicals and forms of radiation. This makes it suitable in, for example, the chemical industry and medicine.
UHMWPE: Abrasive Environments and Low Friction
UHMWPE is suitable for bearing bushings in abrasive environments that require low friction. The material has high wear resistance and good resistance to wear, even in the presence of chemicals and abrasive materials. In addition, UHMWPE has a low coefficient of friction.
To ensure proper function in abrasive environments, high quality and uniform structure are important. The bearing bushings must also be properly designed and manufactured.
Cost and Maintenance Benefits
A major advantage with plastic is lower cost and less maintenance. Plastic bearing bushings can be manufactured with simpler methods and less material, which results in lower costs. They can also operate longer without maintenance, which reduces operating costs.
The choice of material depends on the requirements. In some cases, metal is still the best choice, for example in extremely high mechanical strength or temperature resistance. But in many situations, plastic is a good alternative, especially where low friction, high wear resistance and good chemical resistance are important.
For heavy loads and high speed, PA6G can be good. If there are extreme temperatures and chemicals, PEEK may be a better choice. It's important to choose the right material for each application.
Shore Hardness and Material Properties
When choosing a material, it's important to consider the material properties, such as Shore hardness. This is a measure of a material's hardness, and is specified in Shore D (for example, 65° Shore D). High Shore hardness indicates a harder material, while low Shore hardness indicates a softer material.
The material must have sufficient hardness to withstand the forces. A material that's too soft will wear out too quickly, while a material that's too hard can be brittle.
Design and Manufacturing
When designing and manufacturing bearing bushings in plastic, it's important to consider the material properties and the requirements of the application.
Are you unsure which material is best suited for your application? Please contact us and we'll help you find the right solution!
Bearing Bushings: When Plastic Replaces Metal