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POM vs. POM-C: Understanding the Differences in Engineering Plastics

White POM Sheet & Black POM Rod, White POM Rod

Polyoxymethylene (POM) and POM-C are two widely used engineering plastics known for their excellent mechanical properties, dimensional stability, and low friction. In this blog, we will explore the similarities and differences between POM and POM-C to help you understand which material is best suited for your specific application.

Composition and Manufacturing:
Both POM and POM-C are thermoplastics belonging to the acetal family. They are produced through a polymerization process of formaldehyde, resulting in a highly crystalline and durable material. The primary distinction between the two lies in their manufacturing methods.

POM, also known as acetal homopolymer, is manufactured using a single-step polymerization process. It offers high mechanical strength, stiffness, and excellent dimensional stability. POM is commonly used in applications requiring high precision, such as gears, bearings, electrical connectors, and automotive components.

POM-C, also referred to as acetal copolymer, is produced using a copolymerization process. By introducing a comonomer during the polymerization, the material exhibits enhanced toughness, impact resistance, and better chemical resistance compared to POM. POM-C is commonly employed in applications where resistance to chemicals, hydrolysis, and stress cracking is crucial.

Properties and Applications:
Both POM and POM-C share several desirable properties, including low friction, good wear resistance, and excellent dimensional stability. However, there are specific characteristics that set them apart.

High mechanical strength and stiffness
Good resistance to moisture, solvents, and fuels
Excellent fatigue resistance and creep properties
Widely used in precision engineering applications, automotive parts, and consumer goods

Enhanced toughness and impact resistance
Improved resistance to chemicals, hydrolysis, and stress cracking
Suitable for applications exposed to aggressive environments, such as chemical processing, pump components, and water management systems

POM and POM-C are high-performance engineering plastics with similar properties and applications. The key difference lies in their manufacturing methods, resulting in distinct performance characteristics. Choosing between POM and POM-C depends on the specific requirements of your application, such as mechanical strength, chemical resistance, and environmental conditions. Consulting with material experts and conducting thorough testing will ensure the selection of the most suitable material to achieve optimal performance and longevity in your application

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