2B002 Category 2B

Numerically controlled optical finishing machine tools equipped for selective material removal to produce non-spherical optical surfaces having all of the following characteristics (See List of Items Controlled).

Category 2: Materials Processing

Reasons for control

• NS: National security
• AT: Anti-terrorism

Country chart

List-based license exceptions

Items

1. Items: a. Finishing the form to less (better) than 1.0 µm;
2. b. Finishing to a roughness less (better) than 100 nm rms;
3. c. Four or more axes which can be coordinated simultaneously for “contouring control”; and
4. d. Using any of the following processes:
5. d.1. ‘Magnetorheological finishing (MRF)’;
6. d.2. ‘Electrorheological finishing (ERF)’;
7. d.3. ‘Energetic particle beam finishing’;
8. d.4. ‘Inflatable membrane tool finishing’; or
9. d.5. ‘Fluid jet finishing’.

Related controls

See also 2B001.

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