3815.90.10.00/Tungsten Disulfide Solid Lubricant Catalyst/Japan

Tungsten Disulfide Solid Lubricant Catalyst from Japan

WS2 nanoparticles functioning as both solid lubricant and catalyst in tribochemical reactions. Inorganic tungsten compound classified under HTS 3815.90.1000 for reaction acceleration properties. Used in aerospace and high-vacuum applications.

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

• Raman spectroscopy confirming 2H-WS2 phase essential for classification

• Include friction coefficient data demonstrating catalytic wear reduction mechanism

• Distinguish from pigment uses through application-specific technical literature