We all have to make tough decisions when it comes to selecting materials for engineering projects. With so many mechanical properties and applications, it can be hard to know which material is best suited to the task at hand.

In this article, we'll take an in-depth look at POM / Delrin / Acetal vs PEEK and compare their mechanical properties and applications. We'll explore the benefits and drawbacks of each material, as well as provide a cost comparison so that you can make an informed decision about which one is right for your project.

So let's get started!

Overview of POM/Delrin/Acetal

Overview of POM/Delrin/Acetal

Get an overview of three popular plastics and see how they stack up against PEEK when it comes to their mechanical characteristics and uses.

Polyoxymethylene (POM), also known as Acetal, Delrin, or simply polyacetal, is a semi-crystalline thermoplastic featuring high strength and rigidity, low friction, good dimensional stability, and great wear resistance. This makes it an ideal material for applications in automotive components, gears, bearings, electrical insulators, medical devices, and food packaging.

Acetal copolymer (Delrin) is very similar to POM but features slightly better toughness at lower temperatures and higher impact strength. It is often used in applications such as industrial machinery parts where high stress-resistance is important.

Acetal homopolymer has the best chemical resistance of all three materials but has a lower melting point than both POM and Delrin which makes it less suitable for high temperature environments.

Overall, these three materials offer great mechanical properties while remaining lightweight alternatives compared to metals like stainless steel or aluminum.

Overview of PEEK

Overview of PEEK

You can get a better idea of PEEK by understanding its characteristics and how it compares to other materials. PEEK is a semi-crystalline thermoplastic material that has excellent mechanical properties, such as high strength and stiffness, good fatigue resistance, and low creep over an extended period of time. It's also resistant to various chemicals like fuel, lubricants, and water.

In terms of temperature resistance, PEEK can handle temperatures up to 250°C in short duration applications while its long term heat stability is limited up to 140°C. Compared to the other materials discussed so far (POM/Delrin/Acetal), PEEK has higher tensile strength and chemical resistance but lower impact strength at room temperature.

Ultimately, this makes it ideal for demanding engineering applications such as automotive parts with exposure to extreme temperatures or harsh environments where chemical resistance is necessary.

Comparing the Mechanical Properties

Discover how the different materials stack up in terms of strength and chemical resistance as you compare their mechanical properties.

PEEK, short for Polyetheretherketone, is a semi-crystalline thermoplastic that has excellent mechanical and chemical performance at elevated temperatures. It has a higher tensile strength than both Delrin and Acetal along with superior fatigue resistance. Furthermore, it maintains its properties over a wide temperature range from -150°C to 260°C.

On the other hand, Delrin and Acetal have lower tensile strengths but are more chemically resistant than PEEK. They also display superior impact resistance compared to PEEK when exposed to extreme temperatures, which makes them great for electrical insulation applications.

With all this in mind, it's easy to see why these three materials have become such popular choices for industrial applications due to their unique combination of strength, chemical resistance, and thermal stability.

Benefits and Drawbacks of Each Material

Benefits and Drawbacks of Each Material

We understand that it can be difficult to make an informed decision about which material is best for your project. That's why we're here to help you compare the benefits and drawbacks of each material.

POM is a relatively inexpensive plastic that offers superior wear resistance and dimensional stability over time. It also has good impact strength and chemical resistance. However, it may be prone to creep at higher temperatures.

Delrin is similar to POM but with greater fatigue strength and stiffness.

Acetal is more expensive than POM or Delrin but has excellent machinability, high tensile strength, and good fatigue endurance.

Peek offers great heat resistance, low friction coefficient, high mechanical strength and stiffness at elevated temperatures – making it suitable for extreme conditions – yet its cost makes it prohibitively expensive for most applications.

By understanding the benefits and drawbacks of each material, you can make an informed decision about which one is best for your project.

When to Select POM/Delrin/Acetal

When it comes to selecting a material for your project, POM and Delrin are good choices for wear resistance and dimensional stability, while Acetal is great for machinability and high tensile strength. Here's why you should consider using one of these materials in your next project:

  1. They're inexpensive compared to other materials such as PEEK.
  2. Their mechanical properties make them ideal for use in projects that require precision or tight tolerances.
  3. They offer excellent corrosion resistance and durability, making them perfect for outdoor applications or those exposed to harsh environments.

These materials give you the freedom to tackle any project with confidence, knowing that you have an affordable option that can handle whatever life throws at it! With their outstanding performance qualities, you can rest assured your project will stand the test of time – no matter how difficult the task may be!

When to Select PEEK

Now that we've established when to select POM/Delrin/Acetal, let's turn our attention to selecting PEEK. As a group, we should always weigh the pros and cons of each material before making an educated decision.

PEEK offers a wide range of benefits for various applications due to its high resistance to heat and chemicals, excellent mechanical properties, good electrical insulation, and low water absorption rate. It is also highly resistant to wear and tear, making it suitable for parts where repeated operations are performed.

In addition, it has superior fatigue strength compared to other engineering plastics, which makes it ideal for components used in machines subject to dynamic loads or vibrations. All in all, PEEK is an excellent choice when looking for materials with higher performance requirements than those provided by traditional engineering plastics.

Cost Comparison

Comparing costs between the various materials can be challenging, but it's essential to consider when making an informed decision. When it comes to cost, POM and Delrin are usually more affordable than Acetal and PEEK. This is because they are made with a combination of nylon and polyoxymethylene (POM) or acetal resin respectively, which generally cost less than PEEK and Acetal.

However, while PEEK may be more expensive up front, its high strength-to-weight ratio makes it ideal for applications that require greater strength or lighter weight components. In the long run, this can help reduce total costs by decreasing material waste and increasing efficiency. Ultimately, selecting the right material should depend on your specific application needs: cost is just one factor in making an informed choice that fits within your budget.


In conclusion, you must consider a variety of factors when selecting the right material for your project - from cost to strength to weight. Imagining the end result of your work can help you make an informed decision that will bring success and satisfaction.

Ultimately, whether it's POM/Delrin/Acetal or PEEK, each of these materials has its own unique mechanical properties and applications that are suited to different types of projects.

Consider these three key points when deciding which material is best for your project:

  • Comfort: Which material offers the most comfort in terms of use?
  • Durability: Which material stands up better against wear and tear?
  • Cost Efficiency: Which material offers the greatest value for money?

By taking into account all of the factors discussed in this comprehensive study, you'll be able to make a well-informed decision about which material is right for you!