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Preliminary Affirmative Determination in the Antidumping Duty Investigation of Methylene Diphenyl Diisocyanate from the People’s Republic of China

Preliminary Affirmative Determination in the Antidumping Duty Investigation of Methylene Diphenyl Diisocyanate from the People’s Republic of China

On September 11, 2025, the U.S. Department of Commerce (Commerce) announced its preliminary affirmative determination in the antidumping duty (AD) investigation of methylene diphenyl diisocyanate from the People’s Republic of China (China).

Preliminary Dumping Rates

ProducerExporterWeighted- Average Dumping Rate Margin (percent)
Covestro Polymers (China) Co., Ltd.Covestro Polymers (China) Co., Ltd.376.12
Wanhua Chemical Group Co., Ltd.Shandong Mingko Co., Ltd.376.12
China-Wide Entity511.75*

* This rate is based on facts available with adverse inferences.

Import Statistics

China202220232024
Volume (KG)163,887,704175,534,602198,761,010
Value (USD)$345,563,208$230,840,709$241,014,447

Source: U.S. Census Bureau, accessed through S&P Global Trade Atlas (Harmonized Tariff Schedule of the United States (HTSUS)) subheadings 2929.10.8010 and 3909.31.0000). Imports of methylene diphenyl diisocyanate enter under HTSUS subheadings that may cover subject and non-subject merchandise. Therefore, publicly available import data may not accurately reflect actual imports of methylene diphenyl diisocyanate covered by the scope of the investigation.

Next Steps

  • The final determination of this AD investigation is scheduled to be announced on November 25, 2025, unless postponed.
  • The U.S. International Trade Commission (ITC) is running a concurrent injury determination investigation.  For more information related to the ITC’s timeline, please refer to the ITC’s calendar.
     

Other Case Information

  • The petitioner is the Ad Hoc MDI Fair Trade Coalition, whose members are BASF Corporation (Florham Park, NJ) and The Dow Chemical Company (Midland, MI).
  • For general information and next steps, please refer to a list of preliminary FAQs.

  • Additional case information, including the scope of the investigations, are on file electronically via Enforcement and Compliance’s Antidumping and Countervailing Duty Centralized Electronic Service System (ACCESS). Once you log in, please refer to case number:

    Trading PartnerAD Case Number
    ChinaA-570-200
  • To date, Commerce maintains 779 AD and countervailing duty orders that provide relief to American companies and industries impacted by unfair trade.