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%Except for products described in headings 9903.05.85–9903.05.92, articles the product of Japan, with an ad valorem (or ad valorem equivalent) rate of duty under column 1 less than 12.5 percent, as provided for in U.S. note 52 to this subchapter
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