Mu Metal Foil | HY-MU 80 Magnetic Shielding Alloy ASTM A753
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When a new MRI suite in a Mumbai hospital began showing noisy images and false readings, engineers traced the problem to stray magnetic fields leaking from nearby power equipment and elevators threatening diagnostic accuracy and expensive downtime for procurement teams and OEMs. Switching to properly annealed Mu Metal foil shields around key electronics cut low-frequency interference dramatically, with studies showing MRI measurement errors reduced by up to 10% when high-permeability Mu Metal is correctly applied compared to basic steel enclosures .
Mu Metal (often designated HY-MU 80, Permalloy 80, or ASTM A753 Alloy 4) is a soft magnetic nickel-iron-molybdenum alloy containing about 80% Ni, ~4.2–5.2% Mo, and balance Fe, engineered for extremely high initial and maximum magnetic permeability with very low coercive force . This profile allows Mu Metal foil to absorb and redirect static and low-frequency magnetic fields that conventional stainless steels or copper cannot effectively attenuate, making it indispensable for MRI rooms, aerospace sensors, telecom racks, high-end audio transformers, and precision scientific instruments .
HY-MU 80 grades can achieve maximum permeability values greater than 350,000 when heat treated per ASTM A753, versus typical structural steels with relative permeability around 200–1,000, delivering orders-of-magnitude better shielding performance for low-flux magnetic fields . For procurement heads in chemical, oil & gas, marine, pharma, and power generation, this means more stable instrumentation, quieter signals, and fewer nuisance trips in control systems compared with cheaper “magnetic” steels that only offer partial attenuation .
High-quality Mu Metal Foil ready for industrial use.
Aurico Alloys LLP offers affordable, best quality, authentic Mu Metal Foil as a trusted supplier, manufacturer, and stockist for Indian and international projects, providing EN 10204/3.1 MTC certified HY-MU 80 foil from Mumbai for OEMs, hardware and industrial supply stores, and EPC contractors across sectors . As a Mu Metal foil stockist in C.P. Tank Mumbai with ready stock ASTM A753 Mu Metal foil suppliers in Mumbai, Aurico also supports export orders where Mu Metal foil price per meter and custom cut-to-size shim formats are critical decision factors .
Specification Overview
| Supplier & Manufacturer | Aurico Alloys LLP – Mu Metal foil supplier, stockist, exporter in India to abroad |
|---|---|
| Grade | Mu Metal / HY-MU 80, soft magnetic Ni-Fe-Mo alloy |
| Typical Designations | HY-MU 80, MuMETAL®, Moly Permalloy, Magnifer 7904, Permalloy 80 |
| UNS | UNS N14080 (typical designation cited for high-nickel magnetic shielding alloys) |
| Standards | ASTM A753 Alloy 4 (HY-MU 80 magnetic shielding), tested in accordance with ASTM A596 for permeability |
| Form & Thickness | Thin gauge 0.1 mm Mu Metal foil for flexible magnetic shields; thicker foils and sheet up to several mm for rigid enclosures |
| Supply Condition | Fully annealed Mu Metal foil with maximum permeability up to >350,000 and low coercive force after hydrogen annealing |
| Value Proposition | Custom cut-to-size Mu Metal foil shim manufacturers in Mumbai with MTC certified HY-MU 80 foil exporters in Maharashtra India |
Equivalent Grades & Standards
| Property | Value |
|---|---|
| UNS number | N14080 |
| Werkstoff / EN number | 2.4545 |
| EN designation | NiFe15Mo |
| Density | 8.74 g/cm3 |
| Melting range | 1454.4 °C |
| Maximum permeability | 200000 |
| Coercivity | 0.008-0.02 Oe |
| Residual induction | 3500 G |
| Curie temperature | 390 °C |
| Mean specific heat | 494 J/kg·K |
| Thermal conductivity | 34.6 W/m·K |
| Electrical resistivity (21 °C) | 58 µΩ·cm |
| Modulus of elasticity (cold drawn) | 232 GPa |
| Modulus of elasticity (hydrogen annealed 1121 °C) | 230 GPa |
| Modulus of elasticity (after process anneal 871 °C) | 217 GPa |
| Mean coefficient of thermal expansion (-75 to 25 °C) | 10.8 µm/m·°C |
| Mean coefficient of thermal expansion (-50 to 25 °C) | 10.7 µm/m·°C |
| Mean coefficient of thermal expansion (-25 to 25 °C) | 10.4 µm/m·°C |
| Mean coefficient of thermal expansion (25 to 50 °C) | 12.30 µm/m·°C |
| Mean coefficient of thermal expansion (25 to 100 °C) | 12.40 µm/m·°C |
| Mean coefficient of thermal expansion (25 to 200 °C) | 12.76 µm/m·°C |
| Mean coefficient of thermal expansion (25 to 300 °C) | 13.00 µm/m·°C |
| Mean coefficient of thermal expansion (25 to 400 °C) | 13.30 µm/m·°C |
Identifiers and physical constants for Mu-metal. A dash means no such designation is published for this grade.
Stock & Product Availability
Ready stock ASTM A753 Mu Metal foil suppliers in Mumbai cater to OEM manufacturers and hardware stores needing fast delivery for EMI-sensitive panels, instrument housings, and MRI room retrofits, with Mu Metal foil price per meter optimised for export from India . Typical formats include coils, sheet, and precision shims in 0.1 mm to 0.5 mm thickness, plus custom laser- or waterjet-cut patterns for transformer and sensor shielding .
Chemical Composition
| Element | Min (%) | Max (%) |
|---|---|---|
| Nickel (Ni) | 80 | 82 |
| Molybdenum (Mo) | 3.5 | 6 |
| Manganese (Mn) | — | 0.8 |
| Silicon (Si) | — | 0.5 |
| Cobalt (Co) | — | 0.5 |
| Copper (Cu) | — | 0.30 |
| Chromium (Cr) | — | 0.30 |
| Phosphorus (P) | — | 0.02 |
| Sulfur (S) | — | 0.01 |
| Carbon (C) | — | 0.05 |
| Iron (Fe) | — | Balance |
Composition limits for Mu-metal. These are specification limits for the grade, not measured values for a lot; the mill test certificate supplied with your order states the actual analysis.
Mechanical & Physical Properties
| Property | Typical Value |
|---|---|
| Curie Temperature | ≈460 °C |
| Tensile Modulus (Elastic Modulus) | ≈230 GPa |
| Electrical Resistivity | ≈5.8 × 10⁻⁷ Ω·m |
| Thermal Conductivity | ≈34.6 W/m·K |
| Thermal Expansion Coefficient | ≈10.8–12.4 µstrain/°C |
| Max Permeability (µmax) | >350,000 after proper hydrogen anneal (ASTM A753 Alloy 4) |
| Initial Permeability | ≈80,000–100,000 (typical) at low induction |
| Coercive Force | Very low, ≈0.008–0.02 Oe |
Applications & Benefits
- Medical & MRI: Mu Metal foil for MRI room magnetic interference shielding reduces low-frequency magnetic noise and can enhance diagnostic accuracy by reducing measurement errors up to around 10% when properly applied, compared with non-optimized enclosures . This is crucial for pharma plants with in-house imaging or hospitals in dense urban corridors.
- Aerospace & Defense: High permeability Mu Metal foil for aerospace sensor protection and cryogenic grade Mu Metal foil for scientific research labs shields sensitive instruments from stray fields in satellites, launch vehicles, or cryo test stands where conventional steels cannot attenuate static fields effectively .
- Power, Telecom & Electronics: Soft magnetic Mu Metal foil for low-frequency EMI shielding in control cabinets, plus UNS N14080 Mu Metal foil supplier options for telecommunications filters and base-station racks reduce low-frequency hum and improve signal integrity relative to plain copper or aluminum housings .
- Audio & Instrumentation: Mu Metal foil for high-end audio transformer shielding and magnetic shielding foil equivalent to Permalloy 80 in India helps premium audio OEMs and lab equipment manufacturers lower hum and noise floors compared to standard steel cans .
- Integration & Installation: Thin gauge 0.1 mm Mu Metal foil for flexible magnetic shields can be wrapped around irregular enclosures, and adhesive backed Mu Metal foil for easy electronic component shielding (where available) simplifies retrofit work for hardware and industrial supply stores servicing field technicians .
FAQ & Search Trends
Global Export Destinations
We ship worldwide from Mumbai. See every destination we export to on our export markets page.
Domestic Supply Network
We deliver across India from our Mumbai stockyard. See every city we supply on our supply locations page.
Conclusion
Mu Metal foil (HY-MU 80, ASTM A753 Alloy 4, UNS N14080) provides engineers, fabricators, and procurement heads across medical, aerospace, telecom, audio, chemical, and power industries with best-in-class low-frequency magnetic shielding that far exceeds the performance of conventional metals, and with Aurico Alloys LLP as your partner for certified Mu Metal Foil, are your most sensitive systems truly protected from the magnetic noise that standard materials cannot control ?