What Makes Polyoxymethylene (POM) Essential for Precision Engineering and Industrial Applications?

Introduction

Polyoxymethylene (POM), also known as acetal or polyacetal, is a high-performance engineering thermoplastic prized for its excellent mechanical strength, stiffness, and low friction properties. With outstanding dimensional stability and wear resistance, POM is widely used in automotive, electronics, consumer goods, and industrial machinery where precision and durability are critical.

Product Information

• Name: Polyoxymethylene (POM)

• Also Known As: Acetal, Polyacetal

• Structure: Semi-crystalline polymer with repeating –CH2–O units

• Appearance: Opaque, white or colored pellets

• Processing Methods: Injection molding, extrusion

Key Features

• High mechanical strength and rigidity for load-bearing parts

• ️ Low coefficient of friction for smooth motion in moving parts

• Excellent dimensional stability for precision components

• ️ Good thermal resistance (operating up to 100–120°C)

• ️ Superior wear resistance and fatigue endurance

Applications

POM’s semi-crystalline structure provides tight molecular packing, which results in high rigidity, low friction, and excellent wear resistance. Its low moisture absorption ensures dimensional stability, making it ideal for precision engineering and high-load, moving components.

Advantages

• ✅ Metal-like strength in a lightweight form

• ✅ Low friction and self-lubricating capability

• ✅ Excellent wear and fatigue resistance for moving parts

• ✅ Stable dimensions even in humid environments

• ✅ Good chemical resistance to fuels and solvents

Limitations

• ❌ Not suitable for prolonged high-temperature use above 120°C

• ❌ Limited resistance to strong acids and alkalis

• ❌ Requires UV stabilization for outdoor exposure

FAQs

Q: How does POM compare to Nylon (PA)?
A: POM offers better dimensional stability and lower moisture absorption than PA, while PA provides superior impact resistance and toughness.

Q: Is POM suitable for food-grade applications?
A: Yes, food-grade POM is used in kitchen appliances and food-handling equipment.

Q: Can POM replace metal in mechanical components?
A: Yes, due to its high stiffness and wear resistance, POM is widely used to replace metal in gears, bearings, and precision parts.

Conclusion

Polyoxymethylene (POM) is a versatile engineering thermoplastic delivering exceptional strength, wear resistance, and dimensional stability. Its use in automotive, electronics, machinery, and consumer goods makes it an indispensable material for precision, high-performance applications.