4-Mercaptophenol from Japan
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 — Japan → United States
23.8%
Rate breakdown
9903.04.6211.3%Patented pharmaceutical articles that are the product of Japan, of a European Union member country, of South Korea, of Switzerland, or of Liechtenstein as provided for in subdivisions (c) and (f) of U.S. note 40 to this subchapter
9903.05.4912.5%Except for products described in headings 9903.05.85–9903.05.92, articles the product of Japan, with an ad valorem (or ad valorem equivalent) rate of duty under column 1 less than 12.5 percent, 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