Tungsten Trioxide Powder from China
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 — China → United States
28.7%
Rate breakdown
9903.88.0325%Except as provided in headings 9903.88.13, 9903.88.18, 9903.88.33, 9903.88.34, 9903.88.35, 9903.88.36, 9903.88.37, 9903.88.38, 9903.88.40, 9903.88.41, 9903.88.43, 9903.88.45, 9903.88.46, 9903.88.48, 9903.88.56, 9903.88.64, 9903.88.66, 9903.88.67, 9903.88.68, or 9903.88.69, articles the product of China, as provided for in U.S. note 20(e) to this subchapter and as provided for in the subheadings enumerated in U.S. note 20(f)
9903.05.860%Articles provided for in subdivision (b) of U.S. note 52 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