MuMetal ®Magnetic Shield Corporation

Purpose: MuMetal offers electromagnetic field shielding which includes very high magnetic permeability, the ability to absorb magnetic energy. This metal is used for reducing low-frequency electromagnetic interference (EMI).

Specifications: ASTM A-753, Alloy 4; MIL N-14411C Composition 1

Characteristics:        An alloy with exceptionally high magnetic permeability, very low coercive force, very low core losses and low remanence by magnetic field annealing.

Typical Properties (Annealed):

0.2% Yield Strength                        49 ksi (338 MPa)

Density                                             8.74 g/cm³

Tensile Strength                              530 MPa max.

Electrical Resistivity                        47 microhm cm

Elongation                                        32% in 2” (51 mm)

Grain Size                                         ASTM 5 or finer (Mill annealed)

Hardness                                          ≤ 120 HV (Brinell)

Magnetic Properties:

DC μ at 40 gauss                              80,000

DC μ at 100 gauss                           105.000

DC μ maximum                                350,000

 (0.014” (0.36 mm) test sample thickness after annealing)

Typical Chemistry:

C          0.01 wt%                             Ni            80 wt% max

Mn       0.50 wt%                             Mo          4.85 wt%

P          0.005 wt% max                  Al            0.01 wt% max

S          0.001 wt% max                  Co           0.02 wt% max

Si         0.30 wt%                             Fe           Balance

Cr        0.02 wt% max                                   

    MuMetal is a registered trademark of Magnetic Shield Corporation