what is polyoxymethylene

Understanding Polyoxymethylene: Key Uses & Properties

Welcome to our informative article on polyoxymethylene (POM), also known as acetal or polyacetal. In this article, we will delve into the definition, properties, and common uses of this versatile engineering thermoplastic. Whether you are a professional in the manufacturing industry or simply curious about the world of polymers, this article will provide valuable insights.

Polyoxymethylene is a widely used material in the production of precision parts that require high stiffness, low friction, and dimensional stability. Its exceptional properties, including high strength, hardness, and rigidity, make it a preferred choice in various industries. POM can be manufactured by different chemical companies using slightly different formulations and marketed under different names.

First synthesized by DuPont research chemists in the 1950s, POM has evolved into a reliable and widely used material in automotive, electrical, consumer goods, medical, industrial machinery, packaging, and sports equipment industries. Its opaque white appearance and excellent mechanical properties make it a popular choice for applications where performance is crucial.

In the following sections, we will explore the specific properties of POM plastic, its common applications, advantages, disadvantages, manufacturing process, and even its role in the biomedical field. Stay tuned for comprehensive insights into the world of polyoxymethylene.

Properties of POM plastic

POM plastic, also known as polyoxymethylene, exhibits a range of unique characteristics that make it highly suitable for diverse applications. Let’s explore the key properties of this versatile thermoplastic:

  1. High Mechanical Strength: POM plastic possesses exceptional strength, allowing it to withstand demanding mechanical loads and provide structural integrity.
  2. Low Friction Coefficient: With its self-lubricating properties, POM helps minimize friction and wear, making it an ideal choice for components that require smooth sliding or rotational motion.
  3. Excellent Dimensional Stability: POM exhibits minimal dimensional variations, even in extreme temperature and humidity conditions, ensuring the precision and consistency of manufactured parts.
  4. Good Chemical Resistance: It demonstrates resistance to various chemicals, such as solvents, fuels, oils, and cleaning agents, enhancing its suitability for applications in contact with harsh substances.
  5. Electrical Insulation Properties: POM provides reliable electrical insulation, making it valuable in electrical and electronic applications.
  6. Easy Machinability: POM can be easily machined into complex shapes, allowing for versatile design possibilities and efficient manufacturing processes.
  7. Thermal Stability: It maintains its properties even at elevated temperatures, offering dimensional stability and reliability in high-temperature applications.
  8. Low Water Absorption: POM has low water absorption, which is beneficial in applications where moisture resistance is essential.
  9. Low Coefficient of Thermal Expansion: With its low coefficient of thermal expansion, POM exhibits minimal dimensional changes in response to temperature variations, ensuring dimensional accuracy.
  10. Good Creep Resistance: POM demonstrates excellent creep resistance, minimizing deformation under sustained mechanical stress, and enhancing long-term performance.

These polyoxymethylene characteristics make it a preferred choice in various industries, including automotive, electrical, consumer goods, medical, and industrial machinery.

polyoxymethylene characteristics

Common Applications of POM Material

POM material, also known as polyoxymethylene, is widely utilized across a range of industries due to its exceptional properties and versatility. Let’s explore some of the common applications of this high-performance engineering plastic.

Automotive Industry

In the automotive industry, POM is extensively used for various components that require precision, durability, and high performance. Some common applications include:

  • Fuel system components
  • Gears
  • Bushings
  • Precision parts

Electrical Industry

POM finds its place in the electrical industry, where it is valued for its excellent electrical insulation and mechanical properties. It is commonly used for:

  • Connectors
  • Switches
  • Insulating components

Consumer Goods

POM is a preferred material for many consumer goods due to its combination of strength, durability, and aesthetic appeal. It can be found in various products like:

  • Zippers
  • Handles
  • Fasteners
  • Toys

Medical and Healthcare Applications

In the medical and healthcare field, POM is used for its biocompatibility and resistance to sterilization methods. It is commonly employed for:

  • Surgical instruments
  • Orthopedic implants
  • Drug delivery devices

Industrial Machinery

POM’s high strength, rigidity, and low friction coefficient make it an excellent choice for various industrial machinery applications. It is commonly used for:

  • Gears
  • Bearings
  • Valve parts

Fluid Handling Systems

POM’s chemical resistance and dimensional stability make it suitable for fluid handling systems. It is commonly used for:

  • Pumps
  • Fittings

Packaging Industry

POM is also prevalent in the packaging industry, where it provides excellent sealing properties and durability. It is used for:

  • Bottle caps
  • Closures

Sports and Recreational Equipment

POM’s strength and resistance to wear make it suitable for sports and recreational equipment. It is commonly seen in:

  • Tennis racket frames
  • Ski bindings

polyoxymethylene applications

As you can see, POM has a wide range of applications across various industries, thanks to its exceptional properties and performance. Its versatility and reliability make it a popular choice for manufacturers looking for high-performance engineering plastics.

About EuroPlas POM Plastic Engineering Compound

EuroPlas POM is a high-performance thermoplastic engineered through the copolymerization of formaldehyde. This advanced material offers exceptional mechanical properties, making it a preferred choice for various applications. EuroPlas POM is widely known for its advantages, such as:

  • High Stiffness: EuroPlas POM exhibits superior stiffness, providing excellent structural integrity for precision components.
  • Dimensional Stability: With low coefficient of thermal expansion, EuroPlas POM maintains its shape and size under different temperature conditions, ensuring consistent performance.
  • Low Friction: EuroPlas POM’s low friction coefficient allows for smooth movement and reduces wear in mechanisms and sliding parts.
  • Thermal Stability: EuroPlas POM remains stable at high temperatures, making it suitable for applications where heat resistance is essential.
  • Chemical Stability: EuroPlas POM has excellent resistance to various chemicals, ensuring durability and longevity in demanding environments.
  • Low Water Absorption: EuroPlas POM has minimal water absorption, making it ideal for applications exposed to moisture or humid conditions.

However, EuroPlas POM does have a few limitations to consider:

  • Poor Resistance to Strong Acids and Bases: EuroPlas POM may not be suitable for applications involving strong acid or base environments due to its limited chemical resistance.
  • Limited Processing Temperature Range: EuroPlas POM has specific processing temperature requirements, and exceeding these limits may affect the material’s performance.
  • Formaldehyde Emissions: During processing and certain applications, EuroPlas POM may emit formaldehyde, requiring proper ventilation and handling precautions.

EuroPlas POM is widely used in industries requiring high-performance engineering plastics, including automotive, electrical, consumer goods, medical, industrial machinery, fluid handling systems, packaging, and sports equipment.

Polyoxymethylene Advantages

Development and Production of POM

Polyoxymethylene (POM) is a versatile thermoplastic that can be manufactured through different processes to create homopolymer and copolymer versions. The manufacturing process plays a crucial role in determining the properties and characteristics of the final POM product.

Homopolymer POM Production

Homopolymer POM is produced using anionic catalysis in an organic liquid reaction medium. This process involves the polymerization of formaldehyde to create a high-performance plastic material with exceptional long-term performance and stability. Homopolymer POM exhibits high stiffness, dimensional stability, and excellent resistance to mechanical stress.

Copolymer POM Production

Copolymer POM, on the other hand, is manufactured through the conversion of formaldehyde into trioxane using acid catalysis. This process produces a copolymer with unique properties like easier processing and better color maintenance. Copolymer POM offers improved flow characteristics during the manufacturing process, making it suitable for intricate designs and complex part geometries.

POM materials are available in various forms, such as pellets, sheets, and rods, and can be processed through techniques like injection molding, extrusion, and compression molding. These versatile processing methods allow manufacturers to create POM components and products with precise dimensions and desired properties.

polyoxymethylene manufacturing process

Applications of POM in the Biomedical Field

Polyoxymethylene (POM) has gained significant attention in the biomedical field due to its unique properties and biocompatibility. It has found applications in a range of medical devices and components, contributing to advancements in healthcare and patient well-being.

Joint Replacements

POM is commonly used in the fabrication of joint replacements, such as hip and knee implants. Its high strength, low friction coefficient, and excellent dimensional stability make it an ideal material for these critical load-bearing applications. The bioinert nature of POM reduces the risk of adverse reactions and promotes long-term success for patients undergoing joint replacement surgeries.

Orthopedic Implants

In addition to joint replacements, POM is utilized in various orthopedic implants, including bone plates, screws, and spinal devices. The superior mechanical properties of POM, such as high stiffness and rigidity, ensure stability and support during the healing process. These implants provide structural integrity and aid in the restoration of skeletal function.

Dental Components

POM has also found its way into dental applications, such as crown and bridge frameworks, brackets, and orthodontic appliances. The biocompatibility and dental tissue-friendly characteristics of POM make it a suitable material for these dental components. Its excellent dimensional stability and resistance to wear and moisture contribute to the longevity and reliability of dental restorations.

PROM/hydroxyapatite Nanocomposites

Researchers have explored the incorporation of bioactive additives into POM to enhance its bioactivity and interactions with the surrounding tissues. One such example is the development of POM/hydroxyapatite (HA) nanocomposites. HA is a bioactive ceramic that mimics the mineral component of bone and facilitates bone growth. The addition of HA nanoparticles to POM promotes osseointegration and improves the performance of orthopedic implants.

Benefits of POM in Biomedical Applications Limitations of POM in Biomedical Applications
  • Bioinert and biocompatible
  • High strength and rigidity
  • Low friction coefficient
  • Excellent dimensional stability
  • Durable and long-lasting
  • Poor resistance to strong acids and bases
  • Limited processing temperature range
  • Formaldehyde emissions

The use of POM in biomedical applications demonstrates its versatility and potential in improving the quality of patient care. Ongoing research and developments in POM materials and composites are expected to further expand its applications in the medical field.

Odor concerns and solutions in POM

Polyoxymethylene (POM) is a versatile thermoplastic that possesses exceptional mechanical properties. However, in certain applications, the production of formaldehyde by POM can result in odor concerns. This can be problematic, especially in industries where odor-free products or environments are crucial.

To address this issue, various methods have been developed to eliminate POM odor. One approach is the addition of aminosulfones or odor-reducing additives during the production process. These additives help mitigate the release of formaldehyde and reduce the associated odor.

In addition, shaped articles made from POM are known to slowly release formaldehyde, contributing to odor nuisances over time. To tackle this, techniques such as using inert gas at elevated temperatures have been proposed to detect and mitigate the formaldehyde odor. Another solution is the end-capping of POM with a siloxane linkage. This helps prevent the emission of volatile organic compound (VOC) degradation products, effectively reducing formaldehyde odor.

By implementing these odor-reducing measures, the use of POM can be optimized without compromising the desired product qualities or causing unpleasant odors. These solutions contribute to creating odor-free environments and ensuring the suitability of POM in a wide range of applications.


What is polyoxymethylene (POM)?

Polyoxymethylene, also known as POM or acetal, is an engineering thermoplastic with exceptional properties.

What are the properties of POM plastic?

POM exhibits high mechanical strength, low friction coefficient, excellent dimensional stability, and good chemical resistance.

What are the common applications of POM material?

POM is used in automotive, electrical, consumer goods, medical, industrial machinery, fluid handling systems, packaging, and sports and recreational equipment.

What are the advantages and disadvantages of EuroPlas POM?

EuroPlas POM offers outstanding mechanical properties, excellent thermal stability, low water absorption, and good chemical stability. However, it has limitations such as poor resistance to strong acids and bases, a limited processing temperature range, and formaldehyde emissions.

How is POM produced?

POM can be produced through different manufacturing processes to create homopolymer and copolymer versions. The homopolymer POM is made by anionic catalysis, while the copolymer POM requires the conversion of formaldehyde into trioxane using acid catalysis.

What are the applications of POM in the biomedical field?

POM is used in joint replacements, orthopedic implants, and dental components due to its bioinert nature and biocompatibility.

Are there any odor concerns with POM and how can they be addressed?

POM can produce formaldehyde, leading to odor concerns. Efforts to eliminate the odor include adding odor-reducing additives and using specific detection methods such as inert gas at elevated temperatures.

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