Hierarchy classification:

1. top of the aat hierarchies
2. Materials Facet
3. Materials (hierarchy name)
4. materials (substances)
5. [materials by composition]
6. inorganic material
7. metal
8. [metal by composition or origin]
9. nonferrous metal
10. [copper and copper alloy]
11. copper alloy
12. copper-nickel alloy
13. nickel silver

Anotations

Scope note:

Copper-nickel-zinc alloy, typically 20% zinc, 18% nickel, and the balance copper, used as a base metal for plated silverware, for springs and contacts in electrical equipment, and for corrosion-resistant objects.