n-Propylphosphonic Acid Formulation from Mexico
Formulation primarily of n-propylphosphonic acid for use in corrosion inhibitors and scale control in oilfield chemicals. Classified in HTS 3824.99.93.61 due to the defining phosphorus-n-propyl bond with no additional carbons. This prep is optimized for industrial fluid applications.
Duty Rate — Mexico → United States
15%
Rate breakdown
9903.05.5510%Except for products described in headings 9903.05.85–9903.05.92 and 9903.05.94, articles the product of Mexico, as provided for in U.S. note 52 to this subchapter
Import Tips
• Certify compliance with Clean Water Act if for oilfield use; include end-use statements
• Test for heavy metals as impurities, as exceeding limits triggers waste classification
• Use ISPP codes precisely to avoid bundling with general phosphonates