Diethylphosphinic Acid from Canada
Diethylphosphinic acid is an organophosphorus compound used as flame retardant in polymers. Classified in 2931.90.90.52 as organo-inorganic acid-function compound not covered by earlier P-specific headings.
Duty Rate — Canada → 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
9903.05.2910%Except for products described in headings 9903.05.85–9903.05.93, articles the product of Canada, as provided for in U.S. note 52 to this subchapter
Import Tips
• Corrosive solid UN 3261; use fiber drums with polyethylene liner
• Flame retardant claims require UL certification for end-use validation
• Distinguish from phosphonic acids (2929.90) via P-C vs P-OH bonding