Polyester Filament Leads Upside as Textile Raw Material Market Diverges

In the final week of August 2026, polyester filament yarns—POY, DTY, and FDY—rose collectively, with weekly gains of 2.00%, 1.76%, and 1.70%, respectively. Meanwhile, acrylonitrile plunged 4.46% and PTA fell 3.67%. Such a sharp divergence within the same week is rare in recent textile markets. Behind this lies a redistribution of profits along the supply chain and a clear signal of shifting demand structures.

Divergence: More than Just Supply-Demand

According to public monitoring data covering 17 textile commodities, 10 products rose while only 3 fell, with an average weekly gain of 0.03%. On the surface, the market looked stable, but internally it underwent significant reshuffling. The three polyester filament varieties posted the largest gains, all with year-on-year increases above 21%, indicating a sustained strong cycle rather than a short-term fluctuation. In contrast, acrylonitrile fell 4.46% weekly but still showed a year-on-year gain of 44.12%, suggesting a rapid correction from elevated levels as earlier overvaluation unwinds.

PTA dropped 3.67% to 6,213 yuan per ton, yet still up 26.54% year-on-year. PTA is a key feedstock for polyester filament, so a decline in raw material costs should normally drag down filament prices. However, polyester filament rose instead, implying stronger bargaining power in the filament segment or demand support outweighing cost-side pressure. This pattern of "falling costs, rising product prices" often emerges when demand has its own independent drivers.

Polyester Strength: Demand Shift from Apparel to Industrial Textiles

The immediate cause of the polyester filament rally is high operating rates at downstream weaving mills, particularly in Jiangsu and Zhejiang, where water-jet looms show robust purchasing interest in POY and DTY. More fundamentally, the application scope of polyester filament is expanding—beyond traditional apparel fabrics, demand from automotive textiles, filtration materials, and geotextiles is growing steadily. These industrial applications are less seasonal and less price-sensitive, providing a more stable support base for polyester filament.

Compared with cotton yarn, which remained flat this week with year-on-year gains of only around 5%, polyester filament's 20%-plus annual increase highlights a much stronger cycle. Cotton prices rose 19.12% year-on-year, but cotton yarn prices only increased by 5.89%, severely squeezing spinning margins. This "rising raw materials, stagnating finished goods" pattern is pushing some spinners to switch to blends or chemical fibers, further amplifying polyester demand.

Acrylonitrile and PTA Declines: Valuation Correction in Upstream Feedstocks

Acrylonitrile fell 4.46% this week, the largest decline. Earlier, acrylonitrile prices surged due to tight supply, with year-on-year gains exceeding 50% at one point. High profits spurred plant restarts and new capacity additions, quickly filling the supply gap and causing prices to retreat. For downstream sectors like acrylic fiber and ABS, raw material cost pressure has eased, but caution is needed regarding potential inventory write-downs if prices continue to slide.

PTA's 3.67% drop is more influenced by international oil price fluctuations and ample PX supply. PTA capacity has long been oversupplied, compressing processing margins to low levels. This week's decline is mainly cost-driven. For polyester plants, lower PTA prices reduce raw material costs, but if polyester filament prices also weaken, profit improvement may be limited. This week's counter-trend rally in polyester filament indicates that the polyester segment successfully converted cost advantages into its own profits, potentially improving overall industry profitability.

Industry Impact: Profit Shift from Upstream to Downstream, Procurement Strategies Need Adjustment

This week's price movements reveal a key trend: profit is shifting from upstream raw material segments to downstream processing segments. The seller's market for basic feedstocks like acrylonitrile and PTA is ending, while intermediate products like polyester filament are gaining stronger pricing power due to structural demand growth. This profit shift has far-reaching implications for every link in the textile chain.

For upstream suppliers, the easy profits of the past two years may be over, requiring more refined inventory and capacity management. For midstream processors, lower raw material costs are positive, but whether they can lock in profits depends on the competitiveness of their own products. For downstream buyers, rising polyester filament prices mean higher procurement costs, but relatively stable cotton and viscose prices offer substitution options.

Practical Recommendations

For Buyers - Polyester filament prices are at high year-on-year levels and remain strong in the short term; consider purchasing on an as-needed basis to avoid chasing highs, and watch for potential pullbacks following PTA declines. - Cotton and viscose yarn prices are stable with moderate annual increases; if product quality permits, consider increasing the proportion of blended or viscose raw materials to hedge costs. - With acrylonitrile and PTA prices falling, extend procurement cycles and negotiate more favorable long-term contracts to lock in future costs.

For Exporters - Export quotes for polyester filament-based fabrics can be moderately raised, but assess overseas clients' acceptance of price increases; consider adding price adjustment clauses in contracts. - Monitor cost changes in acrylonitrile downstream products (e.g., acrylic yarn); if raw material prices continue to fall, consider periodically lowering export quotes to enhance competitiveness. - Use the PTA downturn to negotiate more flexible settlement terms with upstream suppliers, such as deferred pricing or batch purchasing, to reduce exchange rate and price volatility risks.