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U.S. Antidumping and Countervailing Duties
Information and Resources for U.S. Trade Remedy Laws and Ongoing Proceedings.
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Commerce Initiates Antidumping Duty Investigation of Methylene Diphenyl Diisocyanate from China

Commerce Initiates Antidumping Duty Investigation of Methylene Diphenyl Diisocyanate from China

On March 5, 2025, the U.S. Department of Commerce (Commerce) announced the initiation of an antidumping duty (AD) investigation of methylene diphenyl diisocyanate (MDI) from the People’s Republic of China (China).

Alleged Dumping Margins

Trading PartnerDumping Margins (Percent)
China305.81 – 511.75

 

Case Calendar

EVENTAD INVESTIGATION
Petition(s) FiledFebruary 12, 2025
Commerce Initiation Date*March 4, 2025
ITC Preliminary Determinations**March 31, 2025*
Commerce Preliminary DeterminationsJuly 22, 2025*
Commerce Final DeterminationsOctober 6, 2025*
ITC Final Determinations***November 20, 2025
Issuance of Orders****November 28, 2025*

NOTE: Commerce’s preliminary and final determination deadlines are governed by statute. For AD investigations, the deadlines are set forth in sections 733(b) and 735(a) of the Tariff Act of 1930, as amended. These deadlines may be extended under certain circumstances.
* Where the deadline falls on a weekend/holiday, the appropriate date is the next business day.
** If the International Trade Commission (ITC) makes a negative preliminary determination of injury, then the corresponding AD investigation will be terminated.
*** This will take place only in the event of a final affirmative determination from Commerce.
**** This will take place only in the event of final affirmative determinations from Commerce and the ITC.

Import Statistics

China202220232024
Volume (kg)163,887,704175,534,602198,761,010
Value (USD)345,563,208230,840,709241,014,447

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 MDI enter under HTSUS subheadings that may cover subject and non-subject merchandise. Therefore, publicly available import data may not accurately reflect actual imports of MDI covered by the scope of the investigation.

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 initiation FAQs.
  • Additional case information, including the scope of the investigations and alleged subsidy programs, 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 the following case number:
Trading PartnerCase Number
ChinaA-570-200
  • To date, Commerce maintains 727 AD and CVD orders that provide relief to American companies and industries impacted by unfair trade.