Final Affirmative Antidumping Duty Determination: Methylene Diphenyl Diisocyanate from China
Summary
The U.S. Department of Commerce issued its final affirmative determination in the antidumping duty investigation of Methylene Diphenyl Diisocyanate from China. The investigation established weighted-average dumping margins of 85.11 percent for named exporters Covestro Polymers and Shandong Mingko, and 159.04 percent for the China-wide entity based on adverse facts available. U.S. imports of MDI from China totaled approximately $241 million in 2024, up from $230.8 million in 2023.
What changed
The Department of Commerce announced final affirmative dumping margins in the antidumping investigation of Methylene Diphenyl Diisocyanate from China. Named exporters Covestro Polymers and Shandong Mingko received a weighted-average margin of 85.11 percent, while the China-wide entity received 159.04 percent based on adverse facts available.
Importers of MDI from China must now pay cash deposits at these rates, significantly increasing the cost of affected imports. The International Trade Commission is conducting a concurrent injury investigation, and duties will only be collected if injury is affirmatively determined. The petitioner is the Ad Hoc MDI Fair Trade Coalition, whose members include BASF Corporation and The Dow Chemical Company.
What to do next
- Review HTSUS subheadings 2929.10.8010 and 3909.31.0000 for affected merchandise
- Prepare for cash deposit requirements at 85.11% or 159.04% dumping margins
- Monitor International Trade Commission injury determination timeline
Penalties
Dumping margins of 85.11% for named exporters (Covestro Polymers, Shandong Mingko); 159.04% for China-wide entity based on adverse facts available
Archived snapshot
Apr 9, 2026GovPing captured this document from the original source. If the source has since changed or been removed, this is the text as it existed at that time.
Final Affirmative Determination in the Antidumping Investigation of Methylene Diphenyl Diisocyanate from China
Final Affirmative Determination in the Antidumping Duty Investigation of Methylene Diphenyl Diisocyanate from the People’s Republic of China
On April 8, 2026, the U.S. Department of Commerce (Commerce) announced its final affirmative determinations in the antidumping duty (AD) investigation of Methylene Diphenyl Diisocyanate from the People’s Republic of China (China).
Final Dumping Margins
China
| Exporter | Producer | Weighted- Average Dumping Rate Margin (percent) |
|---|---|---|
| Covestro Polymers (China) Co., Ltd. | Covestro Polymers (China) Co., Ltd. | 85.11 |
| Shandong Mingko Co., Ltd | Wanhua Chemical Group Co., Ltd | 85.11 |
| China-Wide Entity* | 159.04* |
- Rate based on facts available with adverse inferences.
Import Statistics
| China | 2022 | 2023 | 2024 |
|---|---|---|---|
| Volume (KG) | 163,887,704 | 175,534,602 | 198,761,010 |
| 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 International Trade Commission (ITC) is running concurrent injury determination investigations. For more information related to the International Trade Commission’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 FAQs for the final determination.
- Additional case information, including the scope of the investigations, is 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 numbers A-570-200.
- To date, Commerce maintains 828 AD and CVD orders that provide relief to American companies and industries impacted by unfair trade.
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