MuMetal specifications include high and low magnetic permeability properties

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

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 in. mm		µ 40 G	µ 200 G	µ 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
Type analysis:

Carbon	0.02%	Nickel	80.00%
Manganese	0.50%	Molybdenum	4.20%
Silicon	0.35%	Iron	Balance

Electrical Resistivity
ohm-cir mil/ft	349
microhm-mm	580
Temperature coefficient of electrical resistivity
per °F from 0/930°F	0.0006
per °C from -17.8/499°C	0.0011
Curie temperature	860°F (460°C)
Melting point	2650°F (1454°C)
Specific heat, Btu/lb · °F	0.118
kJ/kg · K	0.494

COEFFICIENT OF THERMAL EXPANSION

Temperature		Coefficient
°F	°C	10 ^-6 /°F	10 ^-6 /°C
-103 to 77	-75 to 25	6.00	10.80
-58 to 77	-50 to 25	5.94	10.70
-11 to 77	-25 to 25	5.78	10.40
77 to 122	25 to 50	6.83	12.30
77 to 212	25 to 100	6.89	12.40
77 to 392	25 to 200	7.09	12.76
77 to 572	25 to 300	7.22	13.00
77 to 752	25 to 400	7.39	13.30