As Chinese chemical fiber exporters struggle to absorb overcapacity in Southeast Asian markets, an old Northeast Asian market is tightening its gates again. On September 3, 2026, South Korea's Ministry of Economy and Finance (MOEF) issued Announcement No. 2026-242, initiating a sunset review of anti-dumping duties on polyester fully drawn yarn (FDY) originating from China, following an application by the Korea Chemical Fibers Association. This development puts the existing duties—ranging from 3.95% to 10.91%, effective since January 2022—under renewed scrutiny, with the outcome set to shape tariff trajectories for the next five years.
Review Timeline and Key Data
The dumping investigation period covers January 1 to December 31, 2025, while the injury investigation period extends from 2021 to 2025, allowing authorities to assess whether Chinese products continue to cause material harm to South Korea's domestic industry. Barring extensions, a final ruling is expected within six months, though past practice suggests delays of up to four months are common, pushing the actual decision window to mid-2027.
The subject product falls under Korean HS code 5402.47.9000, covering polyester fully drawn yarn with a filament fineness exceeding 67 decitex. This higher-end specification is used in industrial yarns, automotive interiors, and premium apparel fabrics, where substitution options are limited. Consequently, any tariff adjustment would have a direct impact on downstream procurement costs.
Industry Impact: From Tariffs to Order Flows
The existing anti-dumping measures, imposed on January 6, 2022, via MOEF Order No. 888, set duties between 3.95% and 10.91%, with the wide spread reflecting varying dumping margins among Chinese producers. A sunset review that maintains duties would continue to burden Chinese FDY exports with additional costs, while revocation could reignite price competition and undermine the pricing power of South Korean domestic producers.
For Chinese exporters, the critical factor is the continued application of duties during the review period. Under WTO rules, anti-dumping measures remain in force until a final determination is made. This means that Chinese factories booking orders from late 2026 through 2027 must factor existing tariffs into their quotes. Given that FDY profit margins are already squeezed by fluctuations in raw material prices like PTA and MEG, any tariff hike could push smaller trading houses out of the Korean market, redirecting supply to tariff-free or low-tariff destinations such as Vietnam or Indonesia.
From a regional industry perspective, the Korea Chemical Fibers Association's application on June 29, 2026, comes amid structural shifts in Sino-Korean chemical fiber trade due to global supply chain realignments. South Korea's FDY production is concentrated in industrial hubs like Ulsan and Jeonju, where capacity utilization has hovered around 70% due to competition from lower-priced Chinese imports. The association's move aims to provide domestic producers with much-needed breathing room.
Practical Recommendations
For Buyers - Monitor the final ruling timeline; if tariff increases are expected, consider signing medium-term price-lock agreements with Korean suppliers before the decision to hedge against tariff risks. - Verify the correct HS classification of your imports to confirm whether they fall under 5402.47.9000, avoiding customs delays due to misclassification. - Develop a list of alternative suppliers and evaluate the cost differences of sourcing equivalent FDY from Southeast Asia or Japan to mitigate sudden tariff changes.
For Trading Companies - Compile export records to South Korea from 2021 to 2025 to prepare for potential questionnaires, ensuring that production, sales, and cost data are complete for defense submissions. - Monitor MOEF's official website for review updates, and consider collaborating with industry associations to file no-injury defense arguments if necessary. - Diversify market expansion efforts, focusing on Belt and Road countries and Latin American markets to reduce dependence on any single country's trade policies.
The review outcome will not only determine tariff levels but also reshape the competitive landscape of the Northeast Asian chemical fiber supply chain. Under the pressure of overcapacity, diversifying export markets has become a necessity for China's polyester industry, and this policy fluctuation in South Korea is just one of many trade barriers on the horizon.