2931.90.90.52/Diethylphosphinic Acid/Japan

Diethylphosphinic Acid from Japan

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 — Japan → United States

12.5%

Rate breakdown

9903.05.4912.5%Section 301 (forced labor) — Japan (col1 rate < 12.5 percent): MFN < 12.5% → total duty capped at 12.5%

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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