3911.90.25.00/Aromatic Polysulfone PSU 1700/Japan

Aromatic Polysulfone PSU 1700 from Japan

High-performance thermoplastic polysulfone resin with aromatic ether-sulfone monomer units in primary granular form. Specifically covered under HTS 3911.90.25.00 for polysulfones containing aromatic monomers.

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

• Certify monomer analysis showing ≥95% aromatic units per subheading note (a)(1)

• Use heat-sealed bags to maintain primary form status

• Pitfall: engineering plastic blends may trigger 3904.40 reclassification