POM-H (Acetal Homopolymer) vs POM-C (Acetal Copolymer): Same POM family — H is slightly stronger, C is more stable
POM-H (Acetal Homopolymer) vs POM-C (Acetal Copolymer)
Side-by-side chemical composition and mechanical property comparison.
Overview
POM-H (Acetal Homopolymer)
Polyoxymethylene Homopolymer — slightly stronger and stiffer than POM-C copolymer but with centerline porosity in stock shapes and lower resistance to hot water/alkalis. Trade names include Delrin (DuPont/DuPont de Nemours) and Tenac (Asahi Kasei). Used for gears, cams, springs, clips, fuel system components, and precision-machined parts where maximum stiffness is needed.
POM-C (Acetal Copolymer)
Polyoxymethylene Copolymer — the precision engineering plastic. Exceptional dimensional stability, low moisture absorption (0.2%), low friction coefficient, and excellent machinability. More hydrolysis-resistant and chemically stable than POM-H (homopolymer). No centerline porosity in stock shapes. Trade names include Hostaform (Celanese), Ertacetal C (MCAM), Duracon (Polyplastics). Used for gears, bearings, valve bodies, pump parts, electrical insulators, and food/medical contact parts.
| POM-H (Acetal Homopolymer) | POM-C (Acetal Copolymer) | |
|---|---|---|
| Material Number | — | — |
| Category | Polymers | Polymers |
| Standard | ISO 10350 | ISO 10350 |
Mechanical properties
| Property | POM-H (Acetal Homopolymer) | POM-C (Acetal Copolymer) | Unit |
|---|---|---|---|
| tensile_strength | 66–73 | 60–67 | MPa |
| yield_strength | 65–70 | 58–62 | MPa |
| elongation | 15–25 | 25–45 | % |
Compatibility Assessment
POM-H (Delrin) has ~10% higher UTS (70 vs 64 MPa) and stiffness but has centerline porosity in stock shapes and is less resistant to hot water and alkalis. POM-C has no porosity, better hydrolysis resistance, and more consistent properties. Choose POM-H for max stiffness (springs, clips); POM-C for general machined parts and chemical exposure.
Frequently Asked Questions
Is POM-H (Acetal Homopolymer) the same as POM-C (Acetal Copolymer)?
POM-H (Acetal Homopolymer) and POM-C (Acetal Copolymer) have a 85% composition overlap. Same POM family — H is slightly stronger, C is more stable
Can I replace POM-H (Acetal Homopolymer) with POM-C (Acetal Copolymer)?
In many cases, yes. The compositions overlap significantly (85%). However, always verify mechanical property requirements and heat treatment compatibility for your specific application.
What is the difference between POM-H (Acetal Homopolymer) and POM-C (Acetal Copolymer)?
The main differences are in the following elements: overall alloying content. POM-H (Acetal Homopolymer) is a Polymers grade, while POM-C (Acetal Copolymer) is a Polymers grade.
Related Comparisons
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Data provided for reference only. Always verify against the applicable specification for critical applications.
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