CNC machining materials
POM (Delrin/Acetal) CNC Machining
POM, the abbreviation of polyoxymethylene (Delrin/ Acetal), is an engineering thermoplastic that can be used in many mechanical applications.
CNC machined POM parts are highly suitable for applications that require high strength and rigidity, low friction, excellent creep and wear resistance, and dimensional stability.
What Is POM (Delrin/Acetal)
Delrin, also known as POM (Polyoxymethylene), is a high-performance engineering thermoplastic that is widely used in CNC machining, injection molding, and 3D printing to create durable, precise components. Delrin’s unique combination of high stiffness, low friction, and excellent dimensional stability makes it an ideal material for high-precision mechanical parts, such as gears, bearings, bushings, and medical devices. In addition, Delrin’s excellent resistance to wear, fatigue, and creep makes it suitable for high-load applications, such as automotive and aerospace components, as well as parts used in the food processing and packaging industries
Types of POM materials
Polyoxymethylene (POM) is available in several popular grades, each with different properties suitable for specific applications. The following are commonly used POM types:
The most common POM grade used for manufacturing is acetal copolymer (POM-C), also known as polyoxymethylene copolymer. POM-C has a good balance of mechanical properties, including high stiffness, low friction, and excellent dimensional stability. It is also resistant to moisture and chemicals, making it suitable for use in a wide range of applications, including automotive, medical, and consumer products.
POM homopolymer (POM-H) is another grade of POM that has higher stiffness and hardness than POM-C, but it is also more brittle and has lower impact strength. POM-H is often used in applications that require high stiffness and strength, such as gears and bearings.
UV stabilized POM is typically used in outdoor or UV-exposed applications where prolonged exposure to sunlight or UV radiation can cause the material to degrade or discolor over time.
This is a specialized grade of POM that is approved for use in contact with food and beverages. It is formulated to meet stringent food safety regulations and does not contain any harmful substances that can leach into food.
POM Mechanical Properties Chart
Material selection can be the difference between success and failure for any project. Educate yourself on material properties to make sure you use them in a way that brings optimal results.
| Density (g /cm3) | Rockwell Hardness | Tensile Strength, Yield | Elongation at Break | Tensile Modulus | Softening Temperature | Friction Coefficient | |
|---|---|---|---|---|---|---|---|
| POM | 1.39-1.43 | 135 MPa | 63 MPa | 27 % | 2600 Mpa | 150℃ | 0.35 |
(1) POM is a crystalline plastic, density of 1.42g/cm3, its steel is very good, commonly known as “race steel”.
(2) POM has fatigue resistance, creep resistance, wear resistance, heat resistance, impact resistance and other excellent performance, and the coefficient of friction is small, self-lubricating good.
(3) POM is not easy to absorb moisture, water absorption rate of 0.22 ~ 0.25%, good dimensional stability in a humid environment, its shrinkage rate of 2.1% (larger), injection molding size is difficult to control, the heat deflection temperature of 172 ℃, paraformaldehyde has two kinds of homopolymer formaldehyde, different performance (homopolymer formaldehyde temperature resistance is better).
Machined Delrin Properties
| Tensile Strength at Yield | Impact Strength | Heat Deflection | Data Sheet | |
|---|---|---|---|---|
| Delrin 150 | 9,000 psi | 1.5 ft-lbs/in | 257-336° F | View PDF |
| Delrin 570 | 8,500 psi | 0.8 ft-lbs/in | 316-345° F | View PDF |
POM CNC Machining Specification
High-precision mechanical parts such as bushings, gears, valves, and bearings components.
High tensile & impact strength, good fatigue and moisture resistance, low friction.
It is determined by the desired effect and the POM type used. A tolerance of ±0.010” (±0.25 mm) is available at Runsom.
It is mostly decided by the available machine and part geometry. A minimum wall thickness of ±0.03” (±0.8 mm) is available at Runsom.
200 x 80 x 100 cm(the available size is mostly decided by the machine and part geometry).
As Machined, Bead Blast.
As fast as 3 days, but it will be finally determined by part complexity and order quantity.
3-axis & 5-axis CNC milling.
Polyoxymethylene Machined Services In China
Anpllocnc is plastic machining specialist of precision CNC machined plastic parts made from pom, delrin (POM-H),acetal and acetal Copolymer (POM-C). Methods include milling, turning,drilling, 3d printing,injection molding,sawing, grinding, boring, broaching, punching, reaming, shearing, sanding and tapping. Low to high volume and short to long run production available. Serves the aircraft, candy, communications, electrical, electronics, forklift, foodservice, medical, government, plating, power transmission, welding and military industries. AutoCAD and SolidWorks® files accepted.
- POM 3D Printing: suitable for plastic parts with complex structure and low dimensional tolerance requirements, suitable for proofing or low-volume manufacturing. The most commonly used material is Delrin, Delrin 3D Printing is more popular.
- POM CNC Milling: Part structure suitable for plastic sheets, processed by 3 aix milling, 4aix milling, and 5aix milling machines, suitable for proofing or low-volume manufacturing
- POM CNC Turning: Parts suitable for plastic rod or tube structures, processed by CNC lathes, suitable for proofing or low-volume manufacturing
- POM Injection Molding: suitable for simple structures, batches of plastic parts, using injection molding machines.
Start your quotation now
Get Instant Pricing and Leadtime for your CNC-machined POM (Delrin/Acetal) Parts!
Anpllo is your partner for design support and manufacturing world-class products, parts, and tooling in various industries. Our mission encompasses accurate, on-time services to all our partners from concept to completion.
©2022. Anpllo All Rights Reserved.