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MuMETAL® Foil (Light Tight) (Ni80-Fe15-Mo5)
Available Configurations
Properties common to all products in this list
| Size |
|---|
| 10 x 10 mm to 100 x 100 mm |
Need custom configurations? Please contact us.
Health hazard/Hazardous to the ozone layer
Serious health hazard
Key Features
MuMETAL® Alloy Foil (Light Tight) (Ni80/Fe15/Mo5) is a pinhole-free certified high-permeability nickel-iron-molybdenum alloy foil combining outstanding low-frequency magnetic shielding performance with guaranteed through-thickness optical barrier integrity:
Outstanding Low-Frequency Magnetic Shielding Performance
MuMETAL® achieves extremely high initial permeability and low coercivity in the annealed condition, providing superior shielding effectiveness against low-frequency magnetic fields that mu-metal uniquely addresses among common metallic shielding materials. The foil form allows layered shielding geometries and conformal wrapping of sensitive instrument assemblies.
Pinhole-Free Certification
Each batch is tested and certified clear of through-thickness defects. In electromagnetic and optical instrument applications, pinholes constitute not only optical leak paths but also localised gaps in the magnetic shielding continuity that would degrade overall shielding effectiveness.
Simultaneous Electromagnetic and Optical Isolation
The combination of MuMETAL®’s established magnetic shielding performance and the certified through-thickness optical barrier provides simultaneous electromagnetic and optical isolation from a single foil component, a combination not achievable with non-magnetic light-tight foils or magnetically permeable foils without pinhole-free certification.
Processing-Dependent Permeability Requiring Careful Heat Treatment
Peak magnetic shielding performance requires controlled annealing in a hydrogen atmosphere to develop the grain structure and remove residual stress that maximize permeability. Mechanical deformation after annealing degrades permeability, and forming should be performed before final anneal where possible.
Stability Under Low-Frequency Magnetic Fields
MuMETAL®’s stability under low-frequency magnetic fields at the low flux densities encountered in sensitive instrument environments qualifies it for shielding in magnetoencephalography systems, precision magnetometers, and photomultiplier tube housings where permeability must be maintained throughout the operating field range.
Industrial Applications
MuMETAL® Alloy Foil (Light Tight) is used wherever outstanding low-frequency magnetic shielding and pinhole-free optical barrier integrity must coexist in the same enclosure element:
- ✦ Precision Enclosures for Sensitive Electronic Instruments
- Used for precision enclosures for sensitive electronic instruments requiring both optical isolation and magnetic field exclusion, where the combination of MuMETAL®’s high permeability and pinhole-free certified barrier provides simultaneous electromagnetic and optical shielding unavailable from either non-magnetic or non-certified alternatives alone.
- ✦ Shielding Components in MRI Systems and Medical Imaging
- Applied as shielding components in MRI system peripherals and medical imaging instrument housings, where low-frequency magnetic field exclusion and optical isolation of photomultiplier and photodetector elements are simultaneously required in the same enclosure structure.
- ✦ Protective Foils in Advanced Detector Housings
- Used as protective foils in advanced detector housings including photomultiplier tube assemblies and magnetometer sensor enclosures, where both magnetic shielding and certified optical isolation prevent signal artefacts from environmental electromagnetic interference and stray light simultaneously.
- ✦ Magnetoencephalography and Low-Noise Electronic Shielding
- Applied in magnetoencephalography (MEG) system construction and low-noise electronic instrument enclosures, where MuMETAL®’s superior low-frequency magnetic shielding effectiveness and the pinhole-free certified barrier combine to protect ultra-sensitive detection systems from both magnetic and optical noise sources.
- ✦ High-Permeability Alloy Processing, Thin-Film Shielding and MEG System Research
- Provides certified barrier foil for research into nickel-iron high-permeability alloy processing optimization, heat treatment and annealing parameter investigation, thin-film magnetic shielding performance, and integration of light-tight MuMETAL® elements into advanced photonic and magnetometric instrument assemblies.
Material Properties
| Element | Value |
|---|---|
| Elongation at break( % ) | 50 |
| Modulus of elasticity( GPa ) | 225 |
| Hardness - Vickers( kgf mm⁻² ) | 115-125 |
| Tensile strength( MPa ) | 500-700 |
| Element | Value |
|---|---|
| Electrical resistivity( µOhmcm ) | 55 |
| Temperature coefficient( K⁻¹ ) | - |
| Element | Value |
|---|---|
| Density( gcm⁻³ ) | 8.8 |
| Element | Value |
|---|---|
| Specific heat( J K⁻¹ kg⁻¹ ) | 455@23°C |
| Thermal conductivity( W m⁻¹ K⁻¹ ) | 19@23°C |
Tolerances
| Thickness | <0.01mm | ±25% |
|---|---|---|
| Thickness | 0.01mm - 0.05mm | ±15% |
| Thickness | >0.05mm | ±10% |
| Linear dimension | <100mm | ±1mm |
| Linear dimension | >=100mm | +2 / -1% |