Diamond Turning Optical Blank

Precision-ground optical blank of germanium or ZnS prepared for single-point diamond turning into aspheres. HTS 9001.90.90.00 as unmounted optical substrate. Used in prototype IR optics manufacturing.

Import Duty Rates by Country of Origin

Origin CountryMFN RateCh.99 SurchargesTotal Effective Rate
🇨🇳ChinaFree+35.0%35%
🇲🇽MexicoFree+10.0%10%
🇨🇦CanadaFree+10.0%10%
🇩🇪GermanyFree+10.0%10%
🇯🇵JapanFree+10.0%10%

Alternative Classifications

This product could be classified differently depending on its characteristics or intended use.

7115.90Lower: 14% vs 35%

If industrial diamonds

Diamond tools Chapter 71; optical materials remain Chapter 90.

8485.90Lower: 10% vs 35%

If diamond turning machines

Note 1(g) excludes machine tools; blanks are optical material.

Not sure which classification is right?

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Import Tips & Compliance

Surface roughness (rms <50nm) and figure error specs pre-turning

Material certificates trace to optical-grade melts

Prototype status may qualify duty relief programs

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