Calcium Fluoride Window from Mexico
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 — Mexico → United States
10%
Rate breakdown
9903.05.5510%Section 301 (forced labor) — additional 10% ad valorem on products of Mexico
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