6C002 Category 6C

Optical sensor materials as follows (see List of Items Controlled).

Category 6: Sensors and Lasers

Reasons for control

• NS: National security
• AT: Anti-terrorism

Country chart

List-based license exceptions

Items

1. a. Elemental tellurium (Te) of purity levels of 99.9995% or more;
2. b. Single crystals (including epitaxial wafers) of any of the following:
3. b.1. Cadmium zinc telluride (CdZnTe), with zinc content less than 6% by 'mole fraction';
4. b.2. Cadmium telluride (CdTe) of any purity level; or
5. b.3. Mercury cadmium telluride (HgCdTe) of any purity level.

Related controls

See also 6C992.

Notes

Technical Note: For the purposes of 6C002.b.1, 'mole fraction' is defined as the ratio of moles of ZnTe to the sum of the moles of CdTe and ZnTe present in the crystal.

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