</>Build with Tariff Intelligence|Programmatic access to tariff calculations and HS code classification.Explore Developer Resources →

High Purity Methylphosphonic Acid for Synthesis from Canada

Ultra-high purity methylphosphonic acid (99.9%) for laboratory and pharmaceutical synthesis, classified under HTS 2931.44.00.00 as a separate chemically defined organo-inorganic compound. Essential precursor for advanced phosphonate drugs and ligands.

Duty Rate — Canada → United States

13.7%

Rate breakdown

9903.05.2910%Section 301 (forced labor) — additional 10% ad valorem on products of Canada

Import Tips

Submit TSCA certification for new chemical import; segregate from amines to avoid reactions

Common pitfall: incorrect purity declaration leading to Chapter 38 reclassification