4,4'-Thiodianiline from Mexico
4,4'-Thiodianiline contains sulfur linkage between aromatic amine rings, used in rubber chemicals and polymer synthesis. HTS 2921.59.80.90 applies as it qualifies as aromatic polyamine rather than organo-sulfur compound per Chapter 29 note exclusion. Sulfur maintains thioether functionality.
Duty Rate — Mexico → United States
16.5%
Rate breakdown
9903.05.5510%Section 301 (forced labor) — additional 10% ad valorem on products of Mexico
Import Tips
• Elemental analysis confirming amine > sulfur functionality required
• Odor control packaging essential due to volatile sulfur compounds
• Rubber chemical end-use declaration prevents dye intermediate misclassification