Isopropyl [O-2-(Methylpropylamino)ethyl] Hydrogen Isopropylphosphonite from Mexico
Complex phosphonite with mixed isopropyl/methylpropyl amino substituents, classified in HTS 2931.49.00.08 for its non-halogenated organo-phosphorus aminoethyl structure. Applied in fine chemical synthesis and agrochemical intermediates.
Duty Rate — Mexico → United States
110%
Rate breakdown
9903.04.6096.3%Except as provided in heading 9903.04.61, patented pharmaceutical articles as provided for in subdivisions (c) and (d) of U.S. note 40 to this subchapter
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
• Customs requires CAS number if assigned; generic phosphonites often lack them—use IUPAC name instead
• Test for phosphorous content to distinguish from sulfonated derivatives excluded from heading 2931
• For R&D imports, use temporary entries under 9813.00.05 to defer duties during testing