2921.59.17.00/3,3'-Diaminobenzidine (Tetraaminobiphenyl)/Japan

3,3'-Diaminobenzidine (Tetraaminobiphenyl) from Japan

3,3'-Diaminobenzidine, a tetrafunctional aromatic polyamine also called tetraaminobiphenyl, is named in HTS 2921.59.1700. It is essential for polybenzimidazole polymers and high-performance engineering plastics.

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

• Include polymerization inhibition certificates if stabilized for transport

• High purity grades (>98%) require HPLC chromatograms for duty verification

• Prevent oxidation during shipping; use nitrogen-purged containers