NBR (Nitrile Rubber) vs POM-C (Acetal Copolymer): 0% composition overlap. Significantly different materials serving different application areas.
NBR (Nitrile Rubber) vs POM-C (Acetal Copolymer)
Side-by-side chemical composition and mechanical property comparison.
Overview
NBR (Nitrile Rubber)
Nitrile butadiene rubber (Buna-N) — THE oil and fuel resistant elastomer. ACN content (18-50%) determines the oil resistance vs low-temp flexibility tradeoff. Higher ACN = better oil resistance but stiffer at low temp. The most widely used seal material worldwide. Used for O-rings, fuel hoses, gaskets, hydraulic seals, oil seals, and nitrile gloves. Not suitable for ozone, UV, or polar solvents (ketones, esters). HNBR variant for higher heat resistance.
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.
| NBR (Nitrile Rubber) | POM-C (Acetal Copolymer) | |
|---|---|---|
| Material Number | — | — |
| Category | Polymers | Polymers |
| Standard | ISO 37 | ISO 10350 |
Chemical composition (wt%) — Pro
| Element | NBR (Nitrile Rubber) | POM-C (Acetal Copolymer) | Overlap |
|---|---|---|---|
| Butadiene | 50–82% | — | — |
| Acrylonitrile (ACN) | 18–50% | — | — |
| Polyoxymethylene (OCH2 units) | — | 95–99% | — |
| Ethylene Oxide Co-Monomer | — | 1–5% | — |
Mechanical properties — Pro
| Property | NBR (Nitrile Rubber) | POM-C (Acetal Copolymer) | Unit |
|---|---|---|---|
| Tensile Strength | 7–24 | 60–67 | MPa |
| Elongation | 200–600 | 25–45 | % |
| hardness_shore_a | 40–90 | — | Shore A |
| Density | |||
| continuous_service_temp | |||
| Yield Strength | |||
| Elastic Modulus | |||
| Melting Point | |||
| Water Absorption (24h) | |||
| Continuous Use Temp |
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NBR (Nitrile Rubber) and POM-C (Acetal Copolymer) have significantly different compositions (0% overlap). These materials are not interchangeable and serve different application areas.
Automated assessment based on composition analysis
Frequently Asked Questions
Is NBR (Nitrile Rubber) the same as POM-C (Acetal Copolymer)?
NBR (Nitrile Rubber) and POM-C (Acetal Copolymer) have a 0% composition overlap. They are generally not directly interchangeable.
Can I replace NBR (Nitrile Rubber) with POM-C (Acetal Copolymer)?
Generally not recommended. The compositions differ significantly (0% overlap). These materials have different alloying concepts and are intended for different applications.
What is the difference between NBR (Nitrile Rubber) and POM-C (Acetal Copolymer)?
The main differences are in the following elements: overall alloying content. NBR (Nitrile Rubber) is a Polymers grade, while POM-C (Acetal Copolymer) is a Polymers grade.
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Data provided for reference only. Always verify against the applicable specification for critical applications.
All data is for reference only. Equivalents indicate similarity, not identity. Always verify against the applicable specification for safety-critical applications. materialref.com accepts no liability for decisions based on this data.