4-Mercaptophenol from Mexico
4-Mercaptophenol is an aromatic organo-thiol used in polymer synthesis and as a corrosion inhibitor. HTS 2930.90.92.51 as other organo-sulfur compound combining phenolic and thiol functions. Off-white solid with dual reactivity.
Duty Rate — Mexico → United States
13.7%
Rate breakdown
9903.05.5510%Section 301 (forced labor) — additional 10% ad valorem on products of Mexico
Import Tips
• Melting point (32°C) testing confirms purity grade
• Oxidation-sensitive; nitrogen blanket packaging required
• Dual phenolic/thiol classification requires sulfur-dominant documentation