Monoclinic Tungsten Trioxide Crystals from Mexico
Synthetic monoclinic WO3 crystals grown for research and thin-film deposition in photochromic applications. HTS 2825.90.30.00 applies as cultured inorganic crystals of metal oxides, excluded from optical elements unless finished. Meets 'chemically defined' criteria.
Duty Rate — Mexico → United States
5.5%
Rate breakdown
9903.05.860%Articles provided for in subdivision (b) of U.S. note 52 to this subchapter
Import Tips
• Declare crystal structure and growth method; distinguish from optical elements (9001) by lack of finishing
• Provide XRD analysis confirming phase purity to avoid reclassification as mixtures
• Small quantities for R&D may qualify for duty relief under GSP or scientific imports