Engineering Plastics vs Traditional Materials: How to Choose the Right Material for Your Application
Engineering Plastics vs Traditional Materials: How to Choose the Right Material for Your Application
Blog Article
Choosing the right material for an engineering application can have a significant impact on performance, durability, maintenance and overall costs.
For decades, materials such as steel, aluminium and other metals have been widely used across manufacturing and industrial applications. However, engineering plastics have become an increasingly important alternative where specific performance characteristics are required.
Engineering plastics can offer benefits such as chemical resistance, low friction, wear resistance, impact strength and reduced weight. However, choosing a plastic simply because it is lightweight or cost-effective is not enough. The right material needs to be selected according to the conditions in which the component will operate.
So, how do engineering plastics compare with traditional materials, and how can you determine which option is right for your application?
What are engineering plastics?
Engineering plastics are high-performance plastics designed for applications where standard plastics may not provide sufficient mechanical, thermal or chemical performance.
Unlike plastics primarily used for packaging or general consumer products, engineering plastics are designed to perform under demanding operating conditions.
Different materials have different properties. For example, polyethylene can provide excellent impact and chemical resistance, while acetal offers good dimensional stability, wear resistance and machinability. PTFE is known for its low friction and chemical resistance, making it suitable for applications such as seals, valve seats and bearing components.
DEMS supplies a wide range of engineering plastics, laminates and composites for different industrial requirements.
Engineering plastics vs metal
One of the most common comparisons is between engineering plastics and metals.
Metal remains the right choice for many applications, particularly where very high strength, rigidity or temperature resistance is required. However, engineering plastics can provide advantages in applications where weight, corrosion, friction or noise are important considerations.
Some engineering plastics can offer:
* Lower weight than many metal alternatives
* Resistance to corrosion and chemicals
* Low friction
* Good wear resistance
* Electrical insulation
* Reduced noise and vibration
* Ease of machining
* Low moisture absorption for certain materials
This can make engineering plastics particularly useful for components such as bearings, rollers, gears, wear strips, guides and other machined parts.
The key is not to assume that plastic is always better than metal. Instead, the material should be selected according to the application's specific requirements.
What should you consider when selecting an engineering plastic?
There is no single engineering plastic that is suitable for every application.
Before selecting a material, it is important to consider the environment and operating conditions the component will be exposed to.
1. Temperature
Temperature can significantly affect the performance of a material.
Some plastics can withstand elevated temperatures better than others, while exposure to very low temperatures can also influence impact strength and other mechanical properties.
Understanding the application's minimum and maximum operating temperatures is therefore an important part of material selection.
2. Chemical exposure
If a component will come into contact with oils, solvents, acids, cleaning chemicals or other substances, chemical resistance should be considered.
Materials such as polyethylene and PTFE can provide strong chemical resistance in suitable applications. However, compatibility depends on the specific chemical, concentration, temperature and exposure conditions.
3. Wear and friction
Components that move against other surfaces may need a material with good wear resistance and suitable friction characteristics.
This is particularly important for bearings, gears, rollers, guides and other moving components.
Acetal, for example, offers good sliding properties, wear resistance and machinability, making it suitable for applications including bearings, cams, gears and conveyor rollers.
4. Impact resistance
Some industrial components need to withstand repeated impacts or mechanical stress.
Engineering plastics can provide useful impact resistance while also reducing the weight of the component compared with some traditional materials.
The correct grade should still be selected based on the expected load and operating environment.
5. Moisture and water exposure
Moisture absorption can affect the dimensional stability and mechanical properties of certain materials.
For applications involving water, humidity or direct contact with liquids, selecting a material with appropriate moisture resistance can help improve component performance and service life.
Polyethylene, for example, has low moisture absorption and is used in applications where hygienic and wet conditions are important.
6. Machining and fabrication
The way a component will be manufactured should also influence material selection.
Some engineering plastics are particularly easy to machine, while others may be better suited to fabrication, welding or moulding.
Acetal is known for its machinability, while certain grades of polyethylene can be fabricated, welded or thermoformed.
Common engineering plastics and their applications
Different engineering plastics have different strengths, which is why material selection should always be application-specific.
Polyethylene
Polyethylene is a versatile engineering plastic with good impact strength, chemical resistance and a low coefficient of friction.
DEMS supplies different polyethylene grades, including PE300, PE500 and PE1000. Depending on the grade, applications can include fabrication, wear components and applications requiring impact and chemical resistance.
Nylon
Nylon is widely used for engineering components where strength, wear resistance and durability are important.
It can be used for a variety of mechanical applications and components.
Acetal
Acetal, also known as POM, offers high rigidity, good dimensional stability, low moisture absorption and good sliding properties.
It is commonly used for components such as gears, bearings, cams, rollers and other precision-machined parts.
PTFE
PTFE is well known for its chemical resistance and very low friction coefficient.
It can be used in applications including seals, valve seats, bearing pads and high-temperature components.
Polycarbonate
Polycarbonate is known for its high impact resistance and dimensional stability. It can be particularly useful where transparency and impact resistance are required, such as machine covers and guards.
When should you consider engineering plastics?
Engineering plastics can be a strong option when an application requires a combination of properties that may be difficult to achieve with traditional materials.
They are worth considering when you need:
* Corrosion or chemical resistance
* Reduced component weight
* Low friction
* Good wear resistance
* Impact resistance
* Electrical insulation
* Reduced maintenance
* Machinability
* Material suitable for wet or hygienic environments
However, material selection should always be based on the actual application rather than choosing a material based on one property alone.
Why technical expertise matters
Selecting an engineering material isn't simply about choosing the strongest or most affordable option.
A material that performs well in one application may perform poorly in another because of differences in temperature, loading, chemicals, moisture, friction or manufacturing requirements.
This is where technical expertise becomes valuable.
DEMS has more than 60 years of experience providing engineering solutions and supplies engineering plastics, laminates and composites alongside rubber and polyurethane moulded components and other industrial products. The company also provides technical expertise for custom moulded components and material selection.
Finding the right engineering plastic for your application
The right material can improve component performance, extend service life and help reduce problems associated with wear, corrosion and maintenance.
But with so many engineering plastics available, selecting the correct option can be challenging.
Instead of simply asking “Which engineering plastic is the strongest?”, consider the more important click here question:
“Which material is best suited to the conditions and requirements of my application?”
By considering factors such as temperature, chemical exposure, friction, wear, impact, moisture and manufacturing requirements, you can narrow down the options and select a material that is fit for purpose.
With a broad range of engineering plastics and technical expertise, DEMS can help businesses identify the right solution for their specific requirements.
Need advice on an engineering plastic for your application? Contact the DEMS team to discuss your requirements and find the right material for your project.
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