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Polyacetal POM

Polyoxymethylene (POM)

writer : polymer shemsh azadi 2025-04-24 07:30:30 340 view comment
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 Polyoxymethylene (POM) | Properties, Applications, and Technical Comparison

What is Polyoxymethylene (POM)?

Polyoxymethylene (POM), also referred to as Acetal, Polyacetal, or Delrin (a common brand name), is a high-performance engineering thermoplastic. Known for its excellent strength, rigidity, and dimensional stability, POM is widely used in precision parts that require low friction, high stiffness, and superior wear resistance.

🔬 Key Technical Features of POM

Property Value / Description
Density ~1.41 g/cm³
Operating Temperature -40°C to +100°C (short term up to 120°C)
Water Absorption Very low (~0.2%)
Tensile Strength 60–70 MPa
Elongation at Break 10–40%
Impact Resistance High (especially in copolymer grades)
Chemical Resistance Good (resistant to solvents, oils, and fuels)
UV Resistance Moderate (requires stabilization for outdoor use)
Machinability Excellent – ideal for CNC and turning
Food Grade Availability Yes (FDA and EU compliant grades available)

🏭 Common Applications of POM

  • ⚙️ Gears and Bearings
    Thanks to its low friction and high wear resistance.

  • 🔩 Precision Mechanical Parts
    Used in automotive and industrial components.

  • 🍽️ Food Processing Equipment
    Available in food-safe grades (POM FG) for hygienic applications.

  • 🚰 Plumbing and Valve Components
    Excellent resistance to water and chemicals.

  • 🔗 Chain Links and Bushings
    High dimensional stability and fatigue resistance.

  • 🪛 Electrical Insulation
    Due to its good dielectric properties.

🎯 Benefits of Using POM

✅ High dimensional stability
✅ Excellent fatigue and impact resistance
✅ Low moisture absorption
✅ Smooth surface finish
✅ Superior machinability
✅ Available in food-safe versions
✅ High strength and rigidity
✅ Resistance to fuel, oils, and chemicals

🧪 Types of POM

  • POM-H (Homopolymer):
    Higher strength and hardness, slightly more brittle.

  • POM-C (Copolymer):
    Better chemical and thermal resistance, improved toughness.

  • Food Grade POM (POM-FG):
    Certified for direct food contact.

  • Reinforced POM (Glass/Fiber Filled):
    Enhanced mechanical properties and dimensional stability.

⚖️ Comparison Table: POM vs Other Engineering Plastics

Property / Polymer POM HDPE PTFE PA (Nylon) PVC
Chemical Resistance Good Excellent Excellent Moderate Moderate
Impact Strength High High Very High Medium-High Good
Moisture Absorption Low Very Low Near Zero High Medium
Machinability Excellent Medium Poor Good Poor
Operating Temperature -40°C to 100°C -50°C to +80°C -200°C to +260°C -40°C to +120°C -10°C to +60°C
Food Grade Availability Yes Yes Yes In FG grades In some grades
Recyclability Moderate Excellent Limited Moderate Good
Relative Cost Medium Low Very High Medium Low

🔍 POM vs Other Polymers – Key Takeaways

  • POM vs HDPE:
    POM offers much better mechanical properties and machining capability, while HDPE is more affordable and has better chemical resistance.

  • POM vs PTFE:
    PTFE excels in chemical and thermal resistance, but POM is far superior in rigidity, ease of machining, and cost-effectiveness.

  • POM vs Nylon (PA):
    POM has lower water absorption and better dimensional stability, whereas nylon has higher toughness in moist environments.

  • POM vs PVC:
    PVC is cheaper and suitable for low-tech applications, while POM offers better performance in technical and mechanical parts.

📚 Conclusion

Polyoxymethylene (POM) is a top choice for industries requiring high-precision plastic components. Its balance of strength, stiffness, low moisture absorption, and excellent machinability makes it suitable for demanding applications across automotive, food, mechanical, and electrical sectors.

Whether you're designing gears, valves, or medical parts, POM delivers consistent performance, especially where metal replacement is desired. It's the go-to engineering plastic for precision, reliability, and long-term durability.

 

 

 

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