ASTM- A- 753, Alloy 3
A.K.A. Mumetal, Hy Mu 77; is a soft magnetic nickel-iron alloy about 78 % nickel, 4.2 – 5.2% Copper, with a saturation induction of approximately 7,500 Gauss, and maximum permeability of 300,000.
Alloy 3 exhibits very high permeability at very low induction, and low coercive force yielding superior magnetic shielding attenuation of low flux density magnetic fields.
Additionally, Alloy 3 cold works extremely well.