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What Is Mu-Metal (UNS N14080) and How It Works in Magnetic Shielding | DOMADIA™
Introduction: The Invisible Problem That Destroys Precision
A medical scanner shows noise. A sensitive sensor gives inconsistent readings. An aerospace navigation system drifts—without any visible reason.
The culprit often isn’t mechanical failure or software error. It’s uncontrolled magnetic interference.
In high-precision industries, magnetic fields you can’t see can silently damage performance. That’s exactly where Mu-Metal (UNS N14080) steps in—and why it remains the gold standard for magnetic shielding worldwide.
At DOMADIA™, Mu-Metal is not treated as just another alloy. It’s treated as a precision solution for critical environments.
What Is Mu-Metal?
Mu-Metal is a nickel-iron soft magnetic alloy engineered specifically for extremely high magnetic permeability.
Its unique structure allows it to attract, absorb, and redirect magnetic flux, preventing sensitive components from being exposed to stray magnetic fields.
The name “Mu” comes from the Greek letter μ (mu), representing magnetic permeability—where this alloy truly excels.
How Mu-Metal Works in Magnetic Shielding
Magnetic shielding doesn’t block magnetism like a wall blocks sound.
Instead, Mu-Metal works like a magnetic sponge.
The Science Behind It
- Mu-Metal has very low magnetic reluctance
- Magnetic field lines prefer traveling through Mu-Metal rather than air
- The alloy guides magnetic flux away from protected components
- Internal fields are reduced dramatically without active power
This passive redirection makes Mu-Metal ideal for static and low-frequency magnetic fields, where conventional shielding fails.
Chemical Composition of Mu-Metal (UNS N14080)
Typical composition:
- Nickel (Ni): ~77%
- Iron (Fe): Balance
- Copper (Cu): ~5%
- Molybdenum (Mo): ~2–4%
This carefully controlled chemistry enables ultra-high permeability and minimal coercivity, which are essential for effective magnetic shielding.
Key Properties of Mu-Metal
| Property | Value |
| Magnetic Permeability | Extremely High |
| Coercivity | Very Low |
| Electrical Resistivity | Moderate |
| Saturation Flux Density | ~0.8 Tesla |
| Mechanical Strength | Moderate |
| Annealing Requirement | Critical |
⚠️ Important: Mu-Metal must be hydrogen annealed after fabrication to restore its magnetic properties. DOMADIA™ ensures proper processing for maximum performance.
Technical Specifications
- UNS Number: N14080
- ASTM Standard: ASTM A753 (Type 4)
- Density: ~8.7 g/cm³
- Curie Temperature: ~450°C
- Operating Environment: Indoor, controlled atmosphere preferred
Standards & Compliance
Mu-Metal supplied by DOMADIA™ meets global standards including:
- ASTM A753
- AMS specifications (where applicable)
- Custom shielding performance requirements
Applications of Mu-Metal Magnetic Shielding
Mu-Metal is used wherever precision meets vulnerability:
Medical & Healthcare
- MRI shielding components
- Medical sensors
- Diagnostic imaging enclosures
Electronics & Semiconductors
- Transformers
- Sensitive IC packaging
- Signal processing equipment
Aerospace & Defense
- Navigation systems
- Avionics shielding
- Guidance instruments
Scientific Research
- Particle detectors
- Quantum computing labs
- Measurement instruments
Industrial Automation
- Sensors & actuators
- Control panels
- Calibration equipment
Shapes & Forms Available at DOMADIA™
DOMADIA™ supplies Mu-Metal in multiple engineered forms:
- Sheets & Plates
- Foils (ultra-thin shielding)
- Cylinders & Tubes
- Custom fabricated enclosures
- Shields & cans (as per drawings)
Custom sizes and post-fabrication annealing services are available on request.
Why Mu-Metal Outperforms Ordinary Shielding Materials
- Ordinary steel saturates quickly
- Aluminum only works for high-frequency EM shielding
- Active shielding requires power and complexity
Mu-Metal Magnetic Shielding remains unmatched for low-field, high-sensitivity environments—making it indispensable despite its premium nature.
Environmental & Lifecycle Advantage
A key advantage often overlooked: longevity.
Mu-Metal shielding:
- Lasts longer
- Requires fewer replacements
- Reduces scrap and re-processing
- Lowers environmental impact over time
By choosing high-performance materials from DOMADIA™, industries contribute to sustainable engineering through durability.
Conclusion: Why Mu-Metal Still Defines Magnetic Shielding
When accuracy matters, shortcuts fail.
Mu-Metal Magnetic Shielding continues to be the trusted solution for controlling invisible forces that can ruin precision systems.
From medical diagnostics to aerospace navigation, Mu-Metal (UNS N14080) proves that smart material selection is the first step toward flawless performance.
At DOMADIA™, we don’t just supply Mu-Metal—we help engineers control magnetism itself.
Looking for reliable Mu-Metal solutions?
Connect with DOMADIA™ for certified materials, custom fabrication, and expert guidance in magnetic shielding applications.
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