Mumetal, Nickel Permalloy, Magnetic shielding foil, Sheet

 

Application

AC
 Electromagnetic Power line , Motor, Coil Very effective
DC
 Geo-magnetic field Earth Very effective
Magnet   effective
(Use Nickel 48% mumetal, 0.35 T)

 

Dimensions

Size 30 cm × 30 cm  (11.8" × 11.8 ")
Thickness 1 mm  (0.0394")

It can be cut to custom size and shape. Write down the dimensions on the order.

Cutting examples

 

 

Annealing

Annealed at 1066℃ for four hours

 

Specification

Main Composition Nikel 80%, Molybdenum 5%, Iron 14%
Specific Gravity 8.74
Thermal Expansion 12.9℃x 10
Tensile Strength 135PS x 10
Yield Strength 21PS x 10

Typical Hardness Ann. (Rockwell B)

58
Elongation (/ 2inch) 38%
Melting Point 2650°F / 1454℃
Thermal Conductivity 240Btu·inch/ ft/ hr/
최소동작온도 4
Electrical Resistivity 620μΩ·mm
Saturation Induction 7,700Gauss
initial permeability 30,000
B-40 Permeability 70,000
B-200 Permeability 90,000
Maximum Permeability 400,000
Coercive Force max. 0.02
Curie Temp 860°F / 460℃

 

 

Annealed at 1066℃ for four hours

 

 

* Demonstration --- Shielding the Neodymium magnetic field using our mumetal (with 0.35mm thickness)

Overview
  • Magnet ── Neodymium magnet (Diameter 2.5 cm, Thickness 5 mm)
  • Gaussmeter ── F.W.Bell 6010 model
  • The gap between Magnet and Probe ── 5mm
  • Mumetal thickness ── 0.35mm (0.35T) , Total 8 layers
  • Method ── Put our mumetal with 1 layer to 8 layers between magnet and sensor.

 

 

Mumetal
Total mumetal thicness
(mm)
Measured value
(G=gauss)
  • Neodymium magnet ≒ 2000G
  • Ferrite magnet ≒ 300G
  • For pefect shielding of magnetic field of Neodymium magnet, Use 10 layers of our 0.35mm thickness mumetal.
0
1229 G
1 layer
0.35
1102 G
2 layers
0.7
977 G
3 layers
1.05
844 G
4 layers
1.4
725 G
5 layers
1.75
590 G
6 layers
2.1
434 G
7 layers
2.45
267 G
8 layers
2.8
131 G

 

 

* Demonstration --- Shielding the Geo-magnetic field using our mumetal (with 0.1mm thickness)
No mumetal
Put geo-magnetic sensor on our mumetal
Wrap geo-magnetic sensor with our mumetal
·
Geo-magnetic field
Measured value
X-axis
42.5 mG
2.3 mG
0.3 G
Y-axis
282.1 mG
32.5 mG
11.7 mG
Z-axis
403.1 mG
358.2 mG
7.1 mG
Max value
493.8 mG
359.7 mG
13.7 mG
Result

With 0.1mm thickness mumetal, Max. 97% shielding rate.

 

 

Our mu-metal items on eBay.

 
Size (cm , inch)
Coating
Price
Order
30×15
30×30
30×45
30×90
30×100
No
One side adhesive
Double side insulation
$
  
11.8"×
5.9"
11.8"×
11.8"
11.8"×
17.7 "
11.8"×
35.4 "
11.8"×
39.4"

Thickness

0.1 T

  
◇
      
◇
    
30
 
◇
  
◇
  
45
 
◇
◇
  
84
 
◇
 
◇
85
       
◇
◇
    
87
 
 
◇
◇
88
0.2 T
  
◇
◇
  
40
     
◇
  
◇
    
120
 
◇
◇
  
130
0.35 T
◇
        
◇
    
35
 
◇
 
◇
  
75
 
◇
  
◇
  
95
 
◇
◇
  
180
       
◇
◇
    
190
1 T
◇
        
◇
    
77
 
◇
      
◇
    
150
2.5 T
◇
  
   
◇
    
150
 
◇
 
◇
  
330

Thickness

0.1 T = 0.1 mm = 0.0039 inch
0.2 T = 0.2 mm = 0.0079 inch
0.35 T = 0.35 mm = 0.0138 inch
1 T = 1 mm = 0.039 inch

 
Size
Coating
Price
Order
cm
47×50
47×100
Double side insulation
$
inch
18.5×19.7
18.5×39.4

Thickness
0.12 T
◇
  
◇
60
◇
◇
120

 

 
Size
Price
Order
cm
23×30
23×45
23×100
30×45
30×100
$
inch
9.25×11.8
9.25×17.7
9.25×39.4
11.8"×17.7 "
11.8"×39.4"

Thickness

0.35 T
◇
 
 
32
◇
  
 
45
◇
 
95
     
◇
  
60
     
◇
120

 

Shielding distinction ( Nickel 80% vs. Nickel 48%)

  Electrical Resistivity Maximum Permeability Saturation flux density Coercivity
Nickel 80% 620 μΩ·mm 400,000 0.75 0.008~0.02
Nickel 48% 480 μΩ·mm 100,000 1.5 0.1

 

<Tip>

Nickel 48% mumetal is more suitable for magnetic shielding of neodymium magnets.
(25% better for blocking effect)

Nickel 48% Permalloy(mumetal) can also be used for AC magnetic field shielding. It shows 80~90% shielding ability of nickel 80% permalloy.