what is polyoxymethylene

Welcome to our comprehensive guide on polyoxymethylene (POM). In this article, we will provide you with a detailed understanding of this versatile engineering thermoplastic and its various applications. Whether you are involved in the industrial, automotive, or medical sector, understanding the properties and advantages of polyoxymethylene can help you make informed decisions in your product development.

Polyoxymethylene, also known as POM or acetal plastic, is a high-performing material that belongs to the family of acetal plastics. Its exceptional strength, rigidity, and durability make it an ideal choice for mechanical parts that require tight dimensional tolerances. The properties of POM include high stiffness and hardness, excellent dimensional stability, low coefficient of friction, good chemical resistance, and high mechanical strength.

These unique characteristics make polyoxymethylene suitable for a wide range of applications. It finds its use in gears, rollers, bearings, food processing equipment, automotive parts, electrical housings and connectors, and even medical devices.

As we delve deeper into our guide, we will explore the specific properties and characteristics of POM plastic, understand the different grades and variants available, compare POM with other engineering thermoplastics, and discuss its wide range of applications in various industries.

Stay with us as we unlock the world of polyoxymethylene and its incredible potential in our next sections.

Key Properties and Characteristics of POM Plastic

POM plastic, also known as polyoxymethylene, exhibits remarkable properties and characteristics that make it a highly desirable engineering thermoplastic. Let’s delve into the key features that set POM apart:

1. High Stiffness and Hardness

POM possesses exceptional rigidity and hardness, which are comparable to die-cast metals, despite its low specific gravity. This property makes POM an ideal choice for applications that require materials with high structural integrity, ensuring dimensional stability and performance under heavy loads.

2. Excellent Dimensional Stability

POM plastic demonstrates outstanding dimensional stability, maintaining precise dimensions even in challenging operating conditions. This property ensures that POM parts uphold tight tolerances, enabling seamless integration and reliable performance within various mechanical systems.

3. Low Coefficient of Friction

The low coefficient of friction of POM results in minimal resistance against other surfaces, making it an excellent choice for applications that demand low friction characteristics. This property provides POM with high abrasion and wear resistance, enhancing the longevity and durability of components.

4. Good Chemical Resistance

POM exhibits good resistance to a wide range of organic solvents, fuels, oils, and greases. This chemical resistance allows POM plastic to maintain its structural integrity and functionality in environments that involve exposure to corrosive substances.

5. High Mechanical Strength

POM possesses exceptional mechanical strength, including high tensile strength, flexural strength, and impact strength. These properties enable POM to withstand high mechanical loads, enhancing its reliability and suitability for demanding applications.

Properties of POM Plastic

Properties POM Plastic
Stiffness and Hardness High
Dimensional Stability Excellent
Coefficient of Friction Low
Chemical Resistance Good
Mechanical Strength High

Table: Key Properties of POM Plastic

POM plastic’s unique combination of properties makes it an excellent choice for various industries and applications, including automotive, electrical, industrial, and medical sectors. Its high stiffness and hardness, excellent dimensional stability, low coefficient of friction, good chemical resistance, and high mechanical strength ensure optimal performance and longevity.

POM Plastic Grades and Variants

POM acetal resin comes in a variety of grades and structural modifications to suit different applications. These variants offer unique properties that enhance the performance and versatility of POM plastic.

1. Unfilled POM (Pure Polymer)

Unfilled POM, also known as the pure polymer, is the base grade of POM plastic. It provides optimal machinability, low friction, and high impact strength. This grade is suitable for various applications where dimensional accuracy and mechanical durability are crucial.

2. Glass Fiber Reinforced POM

Glass fiber reinforced POM contains up to 40% glass fiber as a reinforcement material. This variant enhances the tensile strength, rigidity, dimensional stability, and thermal resistance of POM. It is often used in applications that require high strength and stiffness, such as automotive components, gears, and structural parts.

3. Lubricated POM

Lubricated POM incorporates internal lubricants into the polymer matrix. These lubricants improve machinability and reduce friction characteristics of POM. Lubricated POM is ideal for sliding components, such as bearings and gears, where low friction and wear resistance are essential.

4. Copolymer POM

Copolymer POM is obtained through copolymerization with other monomers. This modification improves the thermal stability and impact resistance of POM, making it more suitable for applications where high temperature or impact loads are involved. Copolymer POM finds applications in automotive parts, electrical connectors, and other demanding industrial environments.

5. Conductive POM

Conductive POM is formulated with conductive fillers like carbon fibers or carbon black. This grade is designed to dissipate electrostatic charges, making it suitable for applications in the electronics industry. Conductive POM is used in products such as switches, connectors, and housings that require electrical conductivity and static charge control.

POM grades and variants

Grade Key Features Applications
Unfilled POM Optimal machinability, low friction, high impact strength Automotive parts, gears, bearings
Glass Fiber Reinforced POM Enhanced tensile strength, rigidity, dimensional stability, thermal resistance Automotive components, structural parts, gears
Lubricated POM Improved machinability, reduced friction, high wear resistance Bearings, gears, sliding components
Copolymer POM Enhanced thermal stability, impact resistance Automotive parts, electrical connectors
Conductive POM Electrical conductivity, static charge control Switches, connectors, electronics applications

How Does POM Stack Up Against Other Engineering Thermoplastics?

When comparing POM to other popular engineering thermoplastics like nylon, PTFE, and basic acetal, POM offers distinct advantages.

POM has lower water absorption than nylon, providing better dimensional stability in humid environments. This superior property ensures that POM maintains its shape and dimensions, making it a reliable choice for applications in varying moisture conditions.

Furthermore, POM exhibits excellent resistance to oils and solvents, far surpassing the performance of moisture-sensitive nylons. This resistance makes POM suitable for use in industries where exposure to chemicals, oils, and solvents is common.

In comparison to PTFE, POM is easier to machine due to its lower abrasiveness. It allows for smoother machining processes, reducing manufacturing time and costs. POM’s machinability makes it a favorable choice for fabricating complex parts with tight specifications.

POM also outperforms basic acetal in several key areas. It boasts higher tensile strength, hardness, and rigidity, making it more resistant to deformation and wear. POM’s superior creep resistance allows it to withstand prolonged exposure to stress and load, ensuring the longevity of components in high-stress applications.

Overall, POM presents a compelling combination of properties that set it apart from other engineering thermoplastics. Its dimensional stability, resistance to oils and solvents, ease of machining, and mechanical robustness make it a versatile and reliable choice across industries.

engineering thermoplastics comparison

Key Advantages of POM over other engineering thermoplastics:

  • Better dimensional stability in humid environments compared to nylon.
  • Superior resistance to oils and solvents compared to nylon.
  • Easier machinability compared to PTFE.
  • Higher tensile strength, hardness, and rigidity compared to basic acetal.
  • Superior creep resistance and stability under load compared to basic acetal.


POM plastic, or polyoxymethylene, is a versatile engineering thermoplastic that offers a range of unique properties and characteristics, making it suitable for various applications. Its exceptional strength, dimensional stability, and chemical resistance distinguish it from other plastics in the market.

With its high strength, POM has become a preferred choice for small, high-precision parts across multiple industries, including industrial, automotive, and medical applications. Its ability to withstand mechanical loads and maintain precise dimensions makes it invaluable in these fields.

As technology continues to advance, innovation in POM plastic is opening up new possibilities. Manufacturers are exploring novel applications and finding creative solutions using this versatile engineering thermoplastic. Businesses can look forward to further advancements in POM plastic technology, as it continues to evolve and enhance its performance in various industries.


What is polyoxymethylene (POM)?

Polyoxymethylene, also known as POM, is a high-performance engineering thermoplastic that belongs to the acetal plastics group. It is used in various applications that require tight dimensional tolerances and high mechanical performance.

What are the properties of polyoxymethylene?

Polyoxymethylene possesses properties such as high stiffness and hardness, excellent dimensional stability, low coefficient of friction, good chemical resistance, and high mechanical strength.

What are the uses of polyoxymethylene?

Polyoxymethylene is commonly used in gears, rollers, wheels, bearings, food processing equipment, automotive parts, electrical housings, connectors, and medical devices.

What are the advantages of polyoxymethylene?

Polyoxymethylene offers distinct advantages such as lower water absorption, better resistance to oils and solvents, easier machinability, and cost-effectiveness compared to other engineering thermoplastics.

What are the applications of polyoxymethylene?

Polyoxymethylene is used in various industries, including automotive, electronics, food processing, and medical, for its superior mechanical properties and dimensional stability.

What are the characteristics of polyoxymethylene?

Polyoxymethylene exhibits high rigidity and hardness, excellent dimensional stability, low friction, good chemical resistance, and high mechanical strength.

Is polyoxymethylene a plastic or a polymer?

Polyoxymethylene is a type of plastic that belongs to the acetal family of polymers.

Are there different grades of polyoxymethylene available?

Yes, polyoxymethylene is available in various grades and variants, including unfilled POM, glass fiber reinforced POM, lubricated POM, copolymer POM, and conductive POM, each suitable for specific applications.

How does polyoxymethylene compare to other engineering thermoplastics?

Polyoxymethylene offers advantages over other engineering thermoplastics like nylon, PTFE, and basic acetal in terms of lower water absorption, better resistance to oils and solvents, easier machinability, and cost-effectiveness.

What are the key properties and characteristics of POM plastic?

POM plastic possesses high stiffness and hardness, excellent dimensional stability, low coefficient of friction, good chemical resistance, and high mechanical strength, making it suitable for demanding applications.

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