Form This specification covers two types of magnetic nickel-iron alloy in the form of sheet and strip. Application These products have been used typically for magnetic circuit parts that require high magnetic permeability at low flux densities with the fabricated parts to be annealed in dry hydrogen@ but usage is not limited to such applications. 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/or molybdenum. Unless a specific type is specified@ either type may be supplied.