Acetal Copolymer (POM-C) (UNS POM-C) is a excellent-to-machine material that we run regularly for export customers. It has a density of 1.41 g/cm3, a tensile strength of 65 MPa and a typical hardness of M 80 (Rockwell). Those numbers make it the right choice for food-contact parts and gears, and a poor choice when cost or corrosion resistance matters more than mechanical performance.
On our machines we hold +/-0.01 mm on turned and milled features and reach Ra 0.4 um where the drawing calls for it. Standard lead time for Acetal Copolymer (POM-C) parts is 3-7 working days, including material procurement, machining and any finishing operation you specify.
Acetal Copolymer (POM-C): key properties
| Property | Value |
|---|---|
| UNS / designation | POM-C |
| Density | 1.41 g/cm3 |
| Tensile strength | 65 MPa |
| Hardness | M 80 (Rockwell) |
| Machinability | Excellent |
| Suggested cutting speed (carbide) | 300-600 m/min |
| Relative material cost | 1 of 5 |
Machining Acetal Copolymer (POM-C): what to plan for
- Slightly lower stiffness than POM-H
- Acid attack at high temp
Cutting speed for Acetal Copolymer (POM-C) with carbide tooling sits around 300-600 m/min. Going faster burns the edge; going much slower causes rubbing and a poor surface. Air blast or flood coolant both work, but chip evacuation must be positive. If your part has thin walls or a lot of stock to remove, say so in the RFQ — we plan roughing, stress relief and finishing as separate operations when the geometry demands it.
Parts we machine in Acetal Copolymer (POM-C)
- Food-contact parts
- Gears
- Conveyor components
- Valve bodies
Most Acetal Copolymer (POM-C) work arrives as 2D drawings with a mix of critical and non-critical features. Loosening tolerance on the non-critical ones is the fastest way to cut cost, and we will tell you which features those are before we quote.
Tolerances, finish and lead time
| Item | Capability |
|---|---|
| General tolerance | +/-0.01 mm |
| Achievable surface finish | Ra 0.4 um |
| Minimum wall thickness | 0.8 mm (aluminium) / 1.0 mm (steel and stainless) |
| Typical lead time | 3-7 working days |
| Prototype quantity | 1 piece |
| Production quantity | 10 to 50,000 pieces |
Frequently asked questions
What is the lead time for Acetal Copolymer (POM-C) parts?
Standard is 3-7 working days from drawing release, assuming the material is in stock. Exotic grades and cast forms can add 5 to 10 days. Finishing such as anodizing or plating adds 3 to 5 days.
What tolerance can you hold in Acetal Copolymer (POM-C)?
+/-0.01 mm is routine on turned and milled features. Tighter than that is possible on specific features by grinding or lapping, but it is quoted separately because it changes the process.
Do you keep Acetal Copolymer (POM-C) in stock?
We hold common sizes of Acetal Copolymer (POM-C) and buy mill-certified stock for everything else. Material certificates are supplied with the parts on request.
Can you supply Acetal Copolymer (POM-C) parts with a certificate of conformity?
Yes. We issue a dimensional report, a material certificate and a certificate of conformity as standard for production orders, and full PPAP or AS9102 paperwork when the programme requires it.
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- Instant CNC quote
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