Tungsten Magnéli Phase Oxide (W18O49) from Mexico
W18O49, a Magnéli phase suboxide used in electrochromic windows and field emission displays. Classified HTS 2825.90.30.00 as specific tungsten oxide composition. Non-stoichiometric but chemically defined per Chapter 28.
Duty Rate — Mexico → United States
5.5%
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
• Rietveld refinement data confirms phase identity for customs chemical experts
• Research quantities may use HTS 9810.00.7500 for duty-free scientific import
• Handle as conductive material; avoid static discharge during transport