4-Mercaptophenol from China
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 — China → United States
112.5%
Rate breakdown
9903.04.6096.3%Except as provided in heading 9903.04.61, patented pharmaceutical articles as provided for in subdivisions (c) and (d) of U.S. note 40 to this subchapter
9903.05.3112.5%Except for products described in headings 9903.05.85–9903.05.92, articles the product of China, as provided for in U.S. note 52 to this subchapter
Import Tips
• Melting point (32°C) testing confirms purity grade
• Oxidation-sensitive; nitrogen blanket packaging required
• Dual phenolic/thiol classification requires sulfur-dominant documentation