Sodium Salt of 2-Phosphonobutane-1,2,4-tricarboxylic acid from China
The tetrasodium salt of PBTC is the most common commercial form, offering better water solubility for cooling water treatment and scale inhibition applications. Classified with parent acid under HTS 2931.90.70.00 per Chapter 29 inorganic salt classification rules.
Duty Rate — China → United States
37.5%
Rate breakdown
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
9903.88.0325%Except as provided in headings 9903.88.13, 9903.88.18, 9903.88.33, 9903.88.34, 9903.88.35, 9903.88.36, 9903.88.37, 9903.88.38, 9903.88.40, 9903.88.41, 9903.88.43, 9903.88.45, 9903.88.46, 9903.88.48, 9903.88.56, 9903.88.64, 9903.88.66, 9903.88.67, 9903.88.68, or 9903.88.69, articles the product of China, as provided for in U.S. note 20(e) to this subchapter and as provided for in the subheadings enumerated in U.S. note 20(f)
Import Tips
• Specify neutralization degree (mono-, di-, tetra-sodium) as all classified identically but affects solubility declarations
• pH and active content analysis required for water treatment chemicals entering TSCA inventory
• Avoid bulk aqueous solutions >50% water which may trigger 'dissolved in water' exclusions per Chapter 29 note 1(d)