Diammonium Tungstate Solution Concentrate from Mexico
Concentrated aqueous solution of diammonium tungstate used in wire drawing lubricants. Though in solution, the active ingredient is ammonium tungstate salt, classified under HTS 2841.80.0010.
Duty Rate — Mexico → United States
5.5%
Rate breakdown
9903.05.860%Universal product exemption (U.S. note 52(b))
Import Tips
• Specify solution concentration (% solids) on invoice to prevent mixture classification
• Classify based on principal salt function, not solvent content
• DOT classification as non-hazardous if <20% concentration