POM / Delrin Material for Precision Machining
POM, also known as Polyoxymethylene or Delrin®, is a high-performance engineering plastic widely used in precision mechanical applications. At MFG SOLUTION CO., LIMITED, we machine POM materials to produce dimensionally stable, low-friction, and wear-resistant plastic components for industrial and commercial use.
Engineers often select POM when applications require high precision, repeated motion, and long-term dimensional stability. Because POM combines excellent machinability with reliable mechanical performance, it is one of the most commonly used plastics for CNC machined functional parts.
What Is POM (Polyoxymethylene / Delrin)?
POM is a semi-crystalline thermoplastic polymer known for its high stiffness, low friction coefficient, and excellent dimensional stability. Manufacturers often refer to POM by the brand name Delrin®, although multiple grades are available from different suppliers.
Engineers frequently use POM as a replacement for metal in precision components. Compared to metals, POM offers lower weight, self-lubricating behavior, and reduced noise during operation. As a result, POM performs especially well in moving assemblies and mechanical systems.
In addition, POM resists fuels, oils, solvents, and many chemicals. Because of this resistance, POM parts maintain stable performance in industrial environments.
POM Grades We Support
At MFG SOLUTION CO., LIMITED, we support commonly used POM grades suitable for CNC machining. Our engineers help customers choose the right grade based on mechanical load, tolerance requirements, and operating environment.
POM Homopolymer (Delrin)
POM homopolymer offers higher mechanical strength and stiffness compared to copolymer grades. Designers often select Delrin for high-precision parts that require tight tolerances and excellent surface finish.
POM Copolymer
POM copolymer provides better chemical resistance and improved thermal stability. Because of this, engineers often choose copolymer grades for applications exposed to moisture or chemicals.
Properties of POM (Polyoxymethylene)
The properties of POM make it one of the most reliable engineering plastics for precision machining. Below is a summary of key material characteristics engineers consider during material selection.
Key Mechanical and Physical Properties
| Property | Typical Value | Performance Description |
|---|---|---|
| Density | ~1.41 g/cm³ | Lightweight compared to metals |
| Tensile Strength | 60–70 MPa | High strength for plastic materials |
| Flexural Modulus | ~2.8 GPa | High stiffness and rigidity |
| Elongation at Break | 20–40% | Good toughness |
| Hardness | Rockwell M80–M90 | Excellent wear resistance |
| Coefficient of Friction | Low | Self-lubricating behavior |
| Moisture Absorption | Very Low | Excellent dimensional stability |
| Operating Temperature | −40°C to 100°C | Suitable for most mechanical uses |
Because POM absorbs very little moisture, it maintains tight tolerances even in humid environments. As a result, engineers often choose POM for precision gears, bushings, and sliding components.
CNC Machining Performance of POM
POM machines exceptionally well using CNC milling and turning processes. Compared to many plastics, it produces clean cuts, smooth surfaces, and minimal burrs.
At MFG SOLUTION CO., LIMITED, our CNC machining approach for POM focuses on:
- Maintaining tight dimensional tolerances
- Preventing heat buildup during cutting
- Achieving consistent surface finish
- Supporting complex geometries
Because POM is stiffer than Nylon, it deforms less during machining. As a result, it performs especially well for parts with tight tolerance requirements.
Typical Applications of POM Parts
Engineers choose POM for applications requiring precision, durability, and low friction. POM parts perform well in both static and dynamic environments.
Common applications include:
- Gears and gear wheels
- Bushings and bearings
- Rollers and pulleys
- Precision fixtures
- Mechanical housings
Because POM reduces wear and noise, manufacturers often use it in automation, robotics, and industrial equipment.
POM vs Nylon: Material Comparison
POM and Nylon are often compared during material selection. While both are engineering plastics, they perform differently in key areas.
| Feature | POM (Delrin) | Nylon (PA) |
|---|---|---|
| Dimensional Stability | Excellent | Good |
| Moisture Absorption | Very Low | Medium |
| Machinability | Excellent | Excellent |
| Wear Resistance | Excellent | High |
| Strength | High | High |
| Typical Use | Precision parts | General mechanical parts |
As a result, engineers often prefer POM for tight-tolerance components, while Nylon suits applications requiring higher toughness.
Design Considerations When Using POM
Although POM offers excellent performance, proper design considerations help maximize its benefits.
Important design tips include:
- Avoiding sharp internal corners
- Designing uniform wall thickness
- Allowing proper tolerances for machining
- Considering load direction in moving parts
By addressing these factors early, engineers can achieve reliable performance and long service life from POM components.
How MFG SOLUTION CO., LIMITED Supports POM Projects
Our engineering team supports customers from early design to final production. Instead of only machining parts, we provide material selection guidance, DFM feedback, and machining optimization.
We support POM projects by:
- Recommending the right POM grade
- Optimizing CNC machining parameters
- Supporting prototypes and mass production
- Ensuring consistent quality inspection
As a result, customers receive POM components that meet both performance and cost requirements.
Frequently Asked Questions (FAQ)
Q1: Is POM suitable for CNC machining?
Yes. POM machines very well and supports tight tolerances.
Q2: What is the difference between Delrin and POM copolymer?
Delrin offers higher strength, while copolymer provides better chemical resistance.
Q3: Does POM absorb moisture?
No. POM absorbs very little moisture and remains dimensionally stable.
Q4: Can POM replace metal parts?
Yes. POM often replaces metal in precision, low-friction applications.
Q5: Do you support mass production of POM parts?
Yes. We support prototype, low-volume, and mass production.