POM-C (Acetal Copolymer) vs PA66 (Nylon 66): Both precision engineering plastics — different moisture behavior
POM-C (Acetal Copolymer) vs PA66 (Nylon 66)
Side-by-side chemical composition and mechanical property comparison.
Overview
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.
PA66 (Nylon 66)
Polyamide 66 — stiffer and more heat-resistant than PA6. Higher crystallinity gives better creep resistance and ~40°C higher melting point (260°C vs 220°C). Slightly more brittle. More moisture-sensitive at saturation than PA6. Trade names include Ultramid A (BASF), Zytel 101 (DuPont), Tecamid 66 (Ensinger). Dominant in US/UK markets. Used for automotive engine components, electrical connectors, gears, cable ties, and industrial bushings.
| POM-C (Acetal Copolymer) | PA66 (Nylon 66) | |
|---|---|---|
| Material Number | — | — |
| Category | Polymers | Polymers |
| Standard | ISO 10350 | ISO 10350 |
Mechanical properties
| Property | POM-C (Acetal Copolymer) | PA66 (Nylon 66) | Unit |
|---|---|---|---|
| tensile_strength | 60–67 | 80–90 | MPa |
| yield_strength | 58–62 | 80–85 | MPa |
| elongation | 25–45 | 15–40 | % |
Compatibility Assessment
POM-C has 10x lower moisture absorption (0.2% vs 2.5% at saturation), better dimensional stability, lower friction, and superior fatigue life. PA66 is stronger (UTS 85 vs 65 MPa dry), tougher, and more heat-resistant (Tm 260 vs 165°C). Choose POM-C for precision/sliding parts; PA66 for structural/heat-loaded parts.
Frequently Asked Questions
Is POM-C (Acetal Copolymer) the same as PA66 (Nylon 66)?
POM-C (Acetal Copolymer) and PA66 (Nylon 66) have a 45% composition overlap. Both precision engineering plastics — different moisture behavior
Can I replace POM-C (Acetal Copolymer) with PA66 (Nylon 66)?
Generally not recommended. The compositions differ significantly (45% overlap). These materials have different alloying concepts and are intended for different applications.
What is the difference between POM-C (Acetal Copolymer) and PA66 (Nylon 66)?
The main differences are in the following elements: overall alloying content. POM-C (Acetal Copolymer) is a Polymers grade, while PA66 (Nylon 66) 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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