Form: This specification covers two types of magnetic nickel-iron alloy in the form of sheet and strip. Application: Primarily for parts used in magnetic circuits requiring high magnetic permeability at low flux densities after high temperature annealing in hydrogen. Classification: The magnetic alloys covered by this specification are classified as follows: Type 1 - Nickel plus iron and other alloying elements@ usually copper and chromium. Type 1 may be required for applications involving severe forming. Type 2 - Nickel plus iron and other alloying elements@ usually copper and molybdenum. Unless a specific type is specified@ either type may be supplied.