Potassium Salt of 2-Phosphonobutane-1,2,4-tricarboxylic acid from Mexico
Dipotassium PBTC salt preferred in potassium-formulated cooling water treatments avoiding sodium discharge limits. Salts of specifically named acids remain in HTS 2931.90.70.00.
Duty Rate — Mexico → United States
10%
Rate breakdown
9903.05.5510%Section 301 (forced labor) — additional 10% ad valorem on products of Mexico
Import Tips
• Potassium content analysis prevents misdeclaration as sodium salt affecting softener compatibility
• Lower alkalinity than sodium salt affects pH adjustment calculations for importers
• Certain states restrict potassium discharge; end-use letters may be required