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Comparison of POM vs PA (Polyamide): Properties, Applications, and Product Types

writer : polymer shemsh azadi 2025-05-08 20:07:21 243 view comment
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Comparison of POM vs PA (Polyamide): Properties, Applications, and Product Types

Introduction

Engineering polymers such as Polyoxymethylene (POM) and Polyamide (PA or Nylon) are among the most widely used thermoplastics in industrial manufacturing. Despite similarities in application areas, they differ significantly in mechanical, chemical, and thermal properties. This article presents a detailed comparison between POM and PA to assist engineers, designers, and procurement specialists in selecting the right material for their specific applications.

What is POM (Polyoxymethylene)?

POM, also known as acetal or polyacetal, is a high-performance engineering plastic characterized by:

  • Excellent dimensional stability

  • Low friction coefficient

  • High mechanical strength

  • Good wear resistance

POM is commonly used in precision parts such as gears, bearings, conveyor rollers, and automotive components.

What is PA (Polyamide)?

PA or Nylon is a versatile engineering polymer known for:

  • High impact resistance

  • Good fatigue strength

  • Excellent chemical resistance (in certain grades)

  • Toughness even at low temperatures

PA is widely used in mechanical parts like bushings, wheels, seals, and structural components.

Detailed Comparison Table: POM vs PA

Property POM (Polyoxymethylene) PA (Polyamide/Nylon)
Mechanical Strength High Moderate to High
Impact Resistance Moderate Excellent
Wear Resistance Excellent Good
Water Absorption Very Low High
Dimensional Stability Very High Moderate
Operating Temperature Range -40°C to +100°C -40°C to +120°C (dry), lower when wet
Friction Coefficient Low Medium
Machinability Excellent Good
UV Resistance Poor (without additives) Better than POM (with stabilizers)
Cost Generally higher More cost-effective

Available Product Types

Product Type POM PA (Nylon)
Sheet/Plate ✅ Yes ✅ Yes
Rod/Bar ✅ Yes ✅ Yes
Tube ✅ Yes ✅ Yes
Welding Rod ✅ Yes ✅ Yes
Custom Machined Parts ✅ Commonly Used ✅ Commonly Used

Applications

POM Applications

  • Precision gears and pulleys

  • Bearings and bushings

  • Valve components

  • Locking systems

PA Applications

  • Structural housings

  • Electrical insulators

  • Automotive under-the-hood components

  • Cable sheathing and fuel lines

Key Takeaways

  • Use POM when low friction, high dimensional stability, and precision are critical (e.g., gears and mechanical interfaces).

  • Use PA when toughness, impact resistance, or chemical durability is more important (e.g., automotive and dynamic parts).

  • PA tends to absorb more moisture, which can influence size and strength, while POM remains stable in humid conditions.

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Tags: POM, Polyamide, Nylon, Engineering Polymers, Industrial Plastics, Comparison

 

 

 

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