2-Phosphonobutane-1,2,4-tricarboxylic acid (PBTC) from Japan
PBTC is a multifunctional organo-phosphorus chelating agent with phosphorus directly linked to carbon, widely used in water treatment, detergents, and corrosion inhibitors. It is explicitly named in HTS 2931.90.70.00 as a specific organo-inorganic compound, including its various salts.
Duty Rate — Japan → United States
12.5%
Rate breakdown
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
• Salts (sodium, potassium, ammonium) classified with acid per Chapter 29 note 3(C)(1); declare salt form and counterion ratio
• Provide end-use statement distinguishing industrial chelator from pesticide intermediates potentially under Chapter 38
• Ensure 98%+ purity certification; technical grade vs. analytical grade affects documentation requirements