Comparing Plastics For CNC Machined Parts: Nylon, Delrin, PEEK & More

Plastics are a common material used in CNC machining for a variety of parts and components. Each type of plastic has its own unique set of characteristics that make it suitable for different applications. In this article, we will compare some of the most commonly used plastics for CNC machined parts, including Nylon, Delrin, PEEK, and more. By understanding the properties of each plastic, you can make an informed decision on which material is best suited for your specific needs.

Nylon

Nylon is a versatile plastic that is known for its excellent strength and durability. It is often used in applications that require high wear resistance and low friction properties. Nylon is also lightweight, making it an ideal choice for parts that need to be both strong and lightweight. In addition, Nylon can be easily machined to tight tolerances, making it suitable for intricate parts with complex geometries. However, Nylon does have a tendency to absorb moisture, which can affect its dimensional stability and performance over time.

Delrin

Delrin, also known as Polyoxymethylene (POM), is a type of acetal plastic that is commonly used in CNC machining. Delrin is known for its excellent stiffness, low friction, and high wear resistance, making it a popular choice for parts that require high precision and tight tolerances. Delrin is also resistant to moisture absorption, making it ideal for applications where dimensional stability is critical. However, Delrin can be more prone to chemical attack than other plastics, so it may not be suitable for all environments.

PEEK

PEEK (Polyetheretherketone) is a high-performance thermoplastic that is often used in challenging environments that require high temperature resistance, chemical resistance, and excellent mechanical properties. PEEK is known for its exceptional strength, stiffness, and dimensional stability, making it a popular choice for applications that require high durability and reliability. PEEK is also resistant to abrasion and wear, making it suitable for parts that experience high levels of stress and friction. However, PEEK can be more expensive than other plastics, so it may not be suitable for all budgets.

Acrylic

Acrylic is a versatile plastic that is commonly used in CNC machining for its clarity, impact resistance, and weatherability. Acrylic is often used in applications that require a transparent or translucent material, such as display cases, light fixtures, and signage. Acrylic is easy to machine and can be polished to a high gloss finish, making it ideal for parts that require a decorative or aesthetic appeal. However, acrylic can be prone to scratching and may not be as durable as other plastics, so it may not be suitable for all applications.

ABS

ABS (Acrylonitrile Butadiene Styrene) is a common thermoplastic that is known for its impact resistance, strength, and toughness. ABS is often used in CNC machining for parts that require good mechanical properties and dimensional stability. ABS is also easy to machine and can be painted or finished with various surface treatments, making it suitable for parts that require a specific aesthetic. However, ABS can be prone to warping and shrinking during machining, so it may not be suitable for parts with tight tolerances or complex geometries.

In conclusion, when choosing a plastic for CNC machined parts, it is important to consider the specific requirements of your application, including strength, durability, temperature resistance, chemical resistance, and budget. By understanding the properties of different plastics, you can make an informed decision on which material is best suited for your specific needs. Whether you choose Nylon for its strength, Delrin for its precision, PEEK for its performance, Acrylic for its clarity, or ABS for its toughness, there is a plastic that is right for your CNC machining needs.