Diethylphosphinic Acid from China
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 — China → United States
41.2%
Rate breakdown
9903.88.0425%Except as provided in headings 9903.88.33, 9903.88.34, 9903.88.36, 9903.88.37, 9903.88.38, 9903.88.40, 9903.88.46, 9903.88.48, 9903.88.56, 9903.88.64, 9903.88.66, 9903.88.67, or 9903.88.69, articles the product of China, as provided for in U.S. note 20(g) to this subchapter and as provided for in the subheadings enumerated in U.S. note 20(g)
9903.05.3112.5%Section 301 (forced labor) — additional 12.5% ad valorem on products of China
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