1C003 Category 1C

Magnetic metals, of all types and of whatever form, having any of the following (see List of Items Controlled).

Category 1: Special Materials and Related Equipment, Chemicals, “Microorganisms,” and “Toxins”

Reasons for control

• NS: National security
• AT: Anti-terrorism

Country chart

List-based license exceptions

Items

1. a. Initial relative permeability of 120,000 or more and a thickness of 0.05 mm or less;
2. b. Magnetostrictive alloys having any of the following:
3. b.1. A saturation magnetostriction of more than 5 × 104−4; or
4. b.2. A magnetomechanical coupling factor (k) of more than 0.8; or
5. c. Amorphous or 'nanocrystalline' alloy strips, having all of the following:
6. c.1. A composition having a minimum of 75% by weight of iron, cobalt or nickel;
7. c.2. A saturation magnetic induction (Bs) of 1.6 T or more; and
8. c.3. Any of the following:
9. c.3.a. A strip thickness of 0.02 mm or less; or
10. c.3.b. An electrical resistivity of 2 × 10−4 ohm cm or more.

Related controls

N/A

Notes

Technical Note: For the purposes of 1C003.a, measurement of initial relative permeability must be performed on fully annealed materials.

Technical Note: For the purposes of 1C003.c, 'nanocrystalline' materials are those materials having a crystal grain size of 50 nm or less, as determined by X-ray diffraction.

Source: eCFR, version 2026-08-01, retrieved 2026-08-20T04:04:59+00:00.