Indole-3-Butyric Acid from China
Indole-3-butyric acid is a synthetic auxin with a four-carbon carboxylic acid chain on indole, under HTS 2933.99.0500 due to indole precedence. Widely used in plant propagation and rooting hormones.
Duty Rate — China → United States
12.5%
Rate breakdown
9903.05.3112.5%Section 301 (forced labor) — additional 12.5% ad valorem on products of China
Import Tips
• Longer chain acids still classified with parent indole structure
• Often imported as potassium salt; classify with base per Chapter 29 note 3(C)
• EPA pesticide registration mandatory if >technical grade concentration