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Calcium Fluoride Window from Japan

An unmounted flat optical window made of calcium fluoride (CaF2) for infrared spectroscopy and laser systems. Falls under HTS 9001.90.90.00 as a non-glass optical element transmitting in UV-IR spectrum. Used unprotected in optical paths requiring high purity.

Duty Rate — Japan → United States

12.5%

Rate breakdown

9903.05.4912.5%Section 301 (forced labor) — Japan (col1 rate < 12.5 percent): MFN < 12.5% → total duty capped at 12.5%

Import Tips

Supply transmission curve data proving IR/UV optical properties to avoid Chapter 69 ceramic classification

Document scratch-dig specifications (e.g

40-20) confirming optical workmanship standards

For AR-coated versions, verify if coating changes classification to mounted assemblies