In the realm of engineering plastics, POM (Polyoxymethylene), commonly known by the brand name Delrin, stands in a league of its own. Often referred to as “Plastic Steel,” it is the go-to high-performance thermoplastic for parts that require metal-like strength combined with the lightweight benefits of plastic.
Exceptional Dimensional Stability: Unlike other plastics that swell with moisture, POM has very low water absorption. This allows it to hold extremely tight tolerances, even in humid environments.
High Rigidity & Strength: It possesses high tensile strength and creep resistance, making it capable of replacing metal in many structural applications.
Natural Lubricity: POM is “slippery” by nature. It has a very low coefficient of friction, which makes it perfect for moving parts like gears, bearings, and bushings without the need for additional grease.
Easy to Machine: It chips beautifully and won’t gum up tools, resulting in an incredibly smooth, burr-free surface finish straight off the CNC machine.
| Property | Typical Value | Unit |
| Tensile Strength | 60 – 70 | MPa |
| Flexural Modulus | 2500 – 3000 | MPa |
| Density | 1.41 – 1.43 | g/cm³ |
| Water Absorption (24h) | 0.2 – 0.25 | % |
| Coefficient of Friction | 0.2 – 0.35 | – |
| Melting Point | 165 – 175 | °C |
| Maximum Service Temp | 90 – 105 | °C |
Applications:
Mechanical Components: Precision gears, cams, and wear strips.
Fluid Handling: Pump impellers, valves, and fuel system components.
Electronics: Insulators, connectors, and high-stability housings.
Consumer Goods: Zippers, fastener clips, and sports equipment parts.
Surface Treatment: POM is chemically resistant, meaning it does not bond well with paint or glue. However, it can be finished via:
Bead Blasting: To create a uniform, matte “satin” texture.
Annealing: A critical post-machining heat treatment to relieve internal stress and prevent warping.
Laser Engraving: For permanent part identification or branding.
At Dewintech, we understand that despite its “easy-to-machine” reputation, POM requires precise thermal management to avoid center-line porosity and dimensional drift. Our CNC experts utilize optimized cutting speeds and specialized coolant strategies to ensure your POM parts are as stable as they are precise. From medical-grade white POM to industrial black Delrin, Dewintech delivers components that perform with the reliability of steel and the efficiency of plastic.
Would you like me to help you decide between standard POM-C and high-performance Delrin (POM-H) for your next project?
Contact us to evaluate manufacturability, tolerances, and cost for your specific application.
We will contact you within 24 hrs, please pay attention to the email with the suffix “@dewintech.com”. Your privacy is safe, we won’t use your email for any other purposes. Download NDA
