Polyester Chain Rises, Acrylonitrile Falls: Structural Divergence Signals in Textile Raw Materials

In the final week of August 2026, polyester filament yarns—POY, DTY, and FDY—collectively strengthened, posting weekly gains of 2.00%, 1.76%, and 1.70%, respectively, while acrylonitrile slumped 4.46% and PTA dropped 3.67%. Such a stark bull-bear divergence within the same week is no coincidence; it reflects distinct supply-demand dynamics across different segments of the textile value chain. For buyers, cost management can no longer rely on a single price indicator but requires layered analysis of each raw material's independent logic.

Polyester Chain's Collective Strength: Demand Resilience or Cost Push?

Polyester POY opened the week at RMB 8,596/ton and closed at RMB 8,767.5/ton, with a year-on-year increase of 24.25%; DTY and FDY rose 21.66% and 21.81% year-on-year, respectively. The broad uptick in polyester filament yarns is primarily supported by high operating rates at downstream weaving mills, which sustain rigid demand for raw materials. Meanwhile, upstream PTA fell 3.67% this week, yet polyester filament did not follow suit; instead, it moved upward, indicating that pricing power has shifted from the cost side to the demand side. With low mill inventories and full order books, polyester producers have the confidence to raise quotes.

Notably, polyester staple fiber fell 0.96%, diverging from filament. Staple fiber is mainly used in nonwovens and some blends, with weaker demand elasticity than filament, and after earlier gains (+17.93% year-on-year), this week's pullback is a technical correction from highs. This filament-strong, staple-weak pattern suggests buyers should differentiate their procurement strategies: filament can be locked in moderately in advance, while staple fiber warrants a wait-and-see approach until stabilization.

Acrylonitrile and PTA Declines: Dual Pressure from High Inventories and Easing Costs

Acrylonitrile fell 4.46% weekly to RMB 11,433.33/ton, yet remains 44.12% higher year-on-year, indicating that earlier excessive gains are now entering a price normalization channel. Downstream sectors such as ABS and acrylic fiber show tepid demand, while supply has loosened due to capacity releases driven by earlier high margins, leading to inventory buildup and forcing producers to cut prices. For acrylic yarn manufacturers dependent on acrylonitrile, lower raw material costs will improve margins, but caution is advised—prices may not have bottomed out, so bulk stockpiling is not recommended.

PTA dropped 3.67% to RMB 6,213.25/ton, still up 26.54% year-on-year. The decline is mainly attributed to volatile international oil prices and weakened PX cost support, alongside increased maintenance at polyester plants, which temporarily reduced PTA procurement demand. As the upstream of polyester, PTA's decline should have weighed on polyester, but filament's counter-trend rise this week shows that downstream demand strength has outweighed cost drags. This decoupling between cost and product prices is uncommon in recent textile markets and reflects a redistribution of profits along the chain.

Cotton and Viscose Stability: Awaiting Direction

Cotton rose 0.06%, cotton yarn 21S and 32S were flat, and viscose staple fiber and rayon yarn edged up 0.42% and 0.69%, respectively. The cotton complex remained calm, partly due to pre-new-crop caution and partly to steady but unexciting downstream yarn orders. Viscose staple fiber is up 10.43% year-on-year, and rayon yarn up 5.66%, both on a moderate upward path but with slowing momentum.

Raw silk rose 0.85% to RMB 427,500/ton, but dropped 9.16% year-on-year—the only product with a negative annual change this week. Recovering cocoon output, coupled with weak downstream silk fabric demand, has kept raw silk prices under prolonged pressure. For silk exporters, lower raw material costs year-on-year help restore export margins, but exchange rate fluctuations may erode actual earnings.

Strategic Implications for Procurement and Export

This week's price list reveals a core message: the textile raw material market has moved beyond broad-based rises or falls into a phase of product-specific divergence. The polyester chain's strength stems from demand pull, acrylonitrile's decline from oversupply, and cotton's stability from seasonal caution. This divergence requires enterprises to establish more refined raw material price monitoring systems, replacing the vague notion of "textile raw material prices" in decision-making.

For Buyers - Polyester filament (POY/DTY/FDY) is likely to remain firm in the near term; if order schedules are locked, consider moderate replenishment on dips, avoiding chasing highs. Monitor downstream weaving operating rates—if they decline, better buying opportunities may arise. - Acrylonitrile remains on a downtrend but at elevated year-on-year levels; procure on a need basis and avoid heavy stockpiling. Watch for potential price reductions in acrylic yarn due to lower costs and renegotiate with suppliers when appropriate.

For Exporters - Polyester fabric export quotes may be adjusted upward to reflect higher raw material costs, but assess overseas clients' acceptance to avoid losing orders; consider incorporating raw material price linkage clauses in contracts. - For exporters of acrylonitrile downstream products, leverage the raw material price decline to optimize margins while monitoring exchange rate risks and using hedging tools to mitigate volatility.