Tungsten Trioxide Powder from Mexico
Tungsten trioxide (WO3) is a yellow-green powder used in gas sensors, smart windows, and catalysts. Classified in HTS 2825.90.90.00 as an other metal oxide of tungsten. It qualifies as a chemically defined inorganic compound per Chapter 28 Note 1.
Duty Rate — Mexico → United States
3.7%
Rate breakdown
9903.03.030%Articles the product of any country, as provided for in subdivision (aa)(ii) of U.S. note 2 to this subchapter
Import Tips
• Provide certificates of analysis confirming WO3 content >99% to avoid reclassification as alloy or waste
• Comply with TSCA regulations; include end-use declaration to prevent diversion to defense applications