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2919.90.50.50/Zinc Dialkyldithiophosphate (ZDDP)/Japan

Zinc Dialkyldithiophosphate (ZDDP) from Japan

ZDDP is a metal salt of phosphorodithioic acid used as extreme pressure lubricant additive. Though organo-sulfur, classified as phosphoric ester salt under HTS 2919.90.50.50 per note 5(C)(1). Essential in engine oils.

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

• Phosphorus/sulfur ratio certification critical

• API specifications documentation