Specifications

MuShield high permeability magnetic shielding material is a non-oriented 80% nickel-iron-molybdenum alloy which offers extremely high initial permeability and maximum permeability with minimum hysteresis loss.

It meets military specification MIL-N-14411 C (MR), and ASTM A-753-78 standard specification.


DC MAGNETIC PROPERTIES

Coercive force from H=1.0 Oe, Oersted 0.008 to 0.02

Hysteresis loss from H=1.0 Oe, erg/cm3 per cycle 18 to 24

DC MAGNETIC PROPERTIES

Form µ at B = 40 G µ max Ho from H=1 Oersted
Bar, Wire 50,000 200,000 0.02 max.

DC hysteresis loss from
H = 1 Oe, erg/cm3 per cycle . . . 16

Induction, gauss . . . . . . . . . . . . 7,300

Residual Induction, gauss . . . . 3,500
  (Split strip or split rod specimens)

AC Magnetic Properties, 60 Hz

Minimum Limits
Thickness
inmm
40 G 200 G 2000 G
0.0251 0.635 35,000 40,000 55,000
0.0141 0.356 55,000 65,000 95,000
0.0061 0.152 65,000 85,000 135,000
0.0022 0.051 70,000 90,000 220,000

1 Ring laminations 1 1/2" (38.1 mm)
   OD x 1" (25.4 mm) ID specimens

2 Tape toroid specimen

Physical Properties

Specific gravity 8.74
Density -- lb/in3 0.316
                kg/m3 8747
Thermal conductivity
Btu-in/ft2/hr/°F 240
W/m· K 34.6

MuShield Magnetic Shielding Material

Carbon 0.02% Nickel 80.00%
Manganese 0.50% Molybdenum 4.20%
Silicon 0.35% Iron Balance
Electric Resistivity
ohm-cir mil/ft 349
microhm-mm 580
Temperature coefficient of electrical resistivity
per °F from 0/930° >0.0006
    per °C from -17.8/499°C 0.0011
Curie temperature 860°F (460°C)
Melting point 2650°F (1454°C)
Specific heatBtu/lb · °F 0.118
kJ/kg · K 0.494

COEFFICIENT OF THERMAL EXPANSION

Temperature

°F °C
-103 to 77 -75 to 25
-58 to 77 -50 to 25
-11 to 77 -25 to 25
77 to 122 25 to 50
77 to 212 25 to 100
77 to 392 25 to 200
77 to 572 25 to 300
77 to 752 25 to 400

Coefficient

10 -6 /°F 10 -6 /°C
6.00 10.80
5.94 10.70
5.78 10.40
6.83 12.30
6.89 12.40
7.09 12.76
7.22 13.00
7.39 13.30