Polyester Filament Rebounds as Textile Raw Material Market Diverges

Polyester filament became the standout performer in the textile raw material market this week. According to data from Shengyi She, during the 34th week of 2026 (August 24-28), polyester POY rose 2.00% week-on-week, DTY and FDY gained 1.76% and 1.70% respectively, all with year-on-year increases exceeding 21%. Meanwhile, upstream materials acrylonitrile and PTA fell sharply by 4.46% and 3.67%, respectively, showing a clear divergence between upstream and downstream. This mixed picture reflects supply-demand mismatches and profit redistribution across the textile chain.

Market Context

This week, 10 products in the textile sector rose, only 3 fell, and the average change was a modest +0.03%. But the breakdown is striking: polyester filament (POY, DTY, FDY) led gains, nylon series (DTY, POY, FDY) followed with increases of 0.29% to 0.97%, while viscose staple fiber and spun rayon also inched up. In contrast, PTA and acrylonitrile posted sharp declines—acrylonitrile dropped 4.46% week-on-week, though still up 44.12% year-on-year, suggesting a correction after excessive earlier gains.

Notably, polyester staple fiber fell 0.96%, diverging from filament. Both are polyester, but filament is used mainly in apparel fabrics, while staple fiber goes into fillings and nonwovens. This divergence may indicate stronger clothing orders but weaker home textiles and industrial demand.

Industry Impact

The rally in polyester filament is primarily driven by restocking among downstream weavers. Late August typically marks the start of autumn/winter fabric orders, boosting demand for POY and DTY. At the same time, falling PTA prices have widened the margin for filament producers. The current spread between POY and PTA has expanded to about 2,554 yuan/ton, improving polyester mills' processing profits significantly.

However, the sharp drop in acrylonitrile warrants caution. Acrylonitrile is a key feedstock for acrylic fiber and ABS. Its price swings affect downstream acrylic yarn and engineering plastics costs. Although the year-on-year gain remains high at 44.12%, the recent correction may ease cost pressure for acrylic producers, but prolonged declines could trigger market wait-and-see sentiment.

From a foreign trade perspective, polyester filament prices up over 20% year-on-year will directly raise fabric procurement costs for apparel exporters. For those with long-term contracts without price locks, profit margins may be squeezed. On the other hand, weak PTA could provide a buffer for future polyester prices; if crude oil stays low, PTA is unlikely to rebound strongly, limiting upside for filament.

Practical Recommendations

For Buyers - Monitor the POY-PTA spread; if it continues to widen, consider delaying purchases for potential pullbacks; otherwise, lock prices early. - Take advantage of acrylonitrile's correction to procure acrylic feedstock in batches, but manage inventory to avoid depreciation in a falling market. - Nylon series rose modestly with lower year-on-year gains than polyester; consider partial substitution to diversify cost risks.

For Foreign Trade Firms - Factor the year-on-year increase in polyester raw materials into quotations; propose price adjustment clauses with clients. - Use the PTA weakness to negotiate long-term supply contracts and lock costs for the next 2-3 months. - Monitor the sustainability of autumn/winter apparel orders; if they disappoint, the polyester rally may not last—avoid high-priced stockpiling.