Monoclinic Tungsten Trioxide Crystals from United States
Monoclinic tungsten trioxide crystals are synthetic crystals of WO3 grown for research and thin-film deposition in photochromic applications. As a chemically defined metal oxide, they fall under Chapter 28. Tariff item 2825.90.00 applies as an 'other' metal oxide, provided the crystals are not optical elements.
Duty Rate — United States → Canada
0%
Import Tips
• Confirm that the crystals are not polished or shaped as optical elements, which would fall under Chapter 90
• Provide the CBSA with the crystal structure and intended use
• If the crystals are doped for electronics, Chapter 38 may apply