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Permalloy Foil
Overview
- Permalloy, magnetic field shielding material, has high permeability with excellent magnetic shielding effectiveness.
- Easy to bend and cut and to process the specific cases as needed
Features
- High permeability
- Magnetic shielding
- Bending, cutting, embedding, double-sided tape, and soldering are easy.
Details
• Material Specifications
| Contents | Data |
|---|---|
| Gravity | 8.74 |
| Coefficient of expansion [℃ x 10-6] | 12.9 |
| Tensile strength [PSI x 103] | 135 |
| Yield strength intensity [PSI x 103] | 21 |
| Hardness (Rockwell B) | 58 |
| Elongation (/2 inch) | 38% |
| Melting point | 2650°F / 1454℃ |
| Thermal conductivity [Btu· inch/ft2/hr/˚F] | 240 |
| Minimum operating temp. | 4°K |
| Contents | Data |
|---|---|
| Electric resistance [μΩ· mm] | 620 |
| Saturation magnetic flux density [Gauss] | 7,700 |
| Initial permeability | 30,000 |
| Permeability (/40B) | 70,000 |
| Permeability (/200B) | 90,000 |
| Maximum permeability | 400,000 |
| Coercivity | max. 0.02 |
| Curie temp | 860°F / 460℃ |
Property of matter of Permalloy PB & PC
| Contents | PB | PC |
|---|---|---|
| Ni Contents | 49% | 80% |
| Gravity | 8.18 | 8.8 |
| Electric resistance | 480μΩ·mm | 620μΩ·mm |
| Curie temp | 449℃ | 460℃ |
| Specific heat | 0.5kJ/(kg·K) | 0.49kJ/(kg·K) |
| Saturation magnetic flux density | 15,000Gauss | 7,700Gauss |
| Coercivity | 0.1 Oe | 0.008~0.02 Oe |
| Maximum permeability (Dc) | 100,000 | 300,000 |
Hysteresis Loop of PC
How to shield the magnetic field
It is most effective to enclose the source or affected parts of the magnetic field shield to completely enclose it, but the shielding effect can be obtained even if only the specific part is covered or the cover type is installed as shown above.
When wrapped in a cylindrical shape or made of a rectangular housing, care should be taken not to create a gap between the joint and between the body and the lid.
* Note: Due to inherent Permalloy properties, loss of properties may result if direct impact is applied during processing or transport.
Applications
Cover the magnetic field parts by permalloy foil, or protect the sensor from external magnetic fields by inserting the sensor control in the permalloy case.
Equipment sensitive to magnetic wave
| Equipment | Effect | Standard |
|---|---|---|
| SEM / E-BEAM | Scanning lines from influence of external magnetic wave | 2mG |
| TEM | The higher the magnification, the more sensitive to magnetic wave | 0.2mG~1mG |
| SQUID | Biomedical ultra-weak self-diagnosis device | |
| MRI | Malfunction because of external D.C magnetic wave | 2mG |
Related Products
MAGshiel Foil
- Ultra-thin magnetic shielding (T 0.005mm ~ 0.030mm)
- High magnetic permeability, low coercive force and low loss characteristics
- It is very flexible, easy to cut and cut half, and is suitable for magnetic field shielding of slim type devices.
MAGshiel Tape
- This product is that pressure-sensitive adhesive added to a MAGshiel foil and has excellent magnetic shielding effectiveness and adhesion.
- Electric field shielding is also possible depending on the adhesive selection