On April 8, 2026, The US Department of Commerce announced that it has issued its final affirmative anti-dumping determination on methylene diphenyl diisocyanate (MDI) from China, imposing duties of 85.11% on major producers and 159.04% on others, a sharp reduction from preliminary rates. The final ruling sets a dumping rate of 85.11% for producer and exporter Covestro Polymers (China) Co., Ltd., producer Wanhua Chemical Group Co., Ltd., and its exporter Shandong Mingko Co., Ltd. All other Chinese producers and exporters received a rate of 159.04%. The products involved fall under US Harmonized Tariff Schedule numbers 2929.10.8010 and 3909.31.0000.
These final rates represent a significant reduction from the preliminary dumping duties of 376.12% to 511.75% announced in September 2025.
The US initiated the anti-dumping investigation on MDI from China on March 4, 2025, and issued its affirmative preliminary determination on September 16, 2025.
Source: trade.gov