Lignin Sulfonate Concrete Dispersant from Mexico
This concentrated sodium-based lignin sulfonate acts as a high-range water reducer in ready-mix concrete, directly derived from black liquor of sulfite pulp mills. It qualifies for HTS 3804.00.5000 as a wood pulp manufacturing residual lye, chemically treated but retaining base composition.
Duty Rate — Mexico → United States
13.7%
Rate breakdown
9903.03.0110%Except for products described in headings 9903.03.02–9903.03.11, articles the product of any country, as provided for in subdivision (aa) of U.S. note 2 to this subchapter
Import Tips
• Submit assay reports confirming >90% lignin sulfonates to prevent reclassification
• EPA may require pre-manufacture notice under TSCA for first imports
• Avoid bulk packaging confusion with similar synthetic superplasticizers