Nickel is only soluble in Silver up to 0.15% and as a consequence most of the alloys in this group of materials are produced by powder metallurgical techniques. This range of materials plays an important role as a heavier-duty material than Fine Silver.
They have a relatively low contact-resistance and high resistance to arc-erosion, especially when switching direct current. Its resistance to welding is superior to that of Fine Silver, but inferior to that of Silver- Metal Oxide in applications over 100A.