Lignin Sulfonate Sodium Salt from Mexico
Sodium lignosulfonate from sulfite pulping of wood contains phenolic sulfo groups, classified as a sulfonated phenol derivative under HTS 2908.99.1500 when meeting chemical purity standards. Used as binder in concrete and dispersant.
Duty Rate — Mexico → United States
15.5%
Rate breakdown
9903.05.5510%Section 301 (forced labor) — additional 10% ad valorem on products of Mexico
Import Tips
• Provide sulfomethylation degree analysis (>15%); ensure <5% carbohydrates
• Common error: Polymer classification under 3913 if molecular weight >10,000 Da