Polyester filament and acrylonitrile took opposite trajectories in the same week: the former rose up to 2%, while the latter plunged 4.46%. Both are upstream textile raw materials, yet such divergence is not coincidental - it reflects the true supply-demand balance and profit distribution across different chain segments. For buyers, this means both rising polyester costs and a potential purchasing window for acrylonitrile derivatives.
Raw Material Market: Fire and Ice
Monitoring data for week 34 of 2026 (Aug 24-28) shows that among bulk commodities in the textile sector, 10 products rose on a week-on-week basis. Polyester POY, DTY, and FDY led with gains of 2.00%, 1.76%, and 1.70%, respectively. Meanwhile, acrylonitrile fell 4.46% to lead decliners, followed by PTA (-3.67%) and polyester staple fiber (-0.96%). The overall average weekly change was a mere 0.03%, indicating structural divergence rather than broad recovery.
The collective strength of polyester filament contrasts sharply with declines in PTA and staple fiber. Filament prices rose while feedstock PTA fell, meaning processing margins for polyester producers expanded notably during the week. This margin expansion typically stems from improved downstream orders, especially autumn/winter fabric stocking. In contrast, the decline in polyester staple fiber suggests weaker demand from nonwovens and filling materials, highlighting a demand structure difference.
Acrylonitrile's deep drop follows a different logic. Its year-on-year gain remains high at 44.12%, indicating prices were elevated earlier and this is a correction from highs. The weekly 4.46% decline, coupled with PTA's weakness, implies softening upstream cost support. More fundamentally, new capacity additions in the acrylonitrile industry are gradually coming online, shifting supply expectations toward surplus, while downstream demand from acrylic fiber and ABS has not kept pace.
Industrial Transmission Logic Behind the Divergence
The divergence between polyester filament and acrylonitrile essentially reflects profit redistribution along the industrial chain. Polyester filament benefits from inventory replenishment by fabric weavers, driven by improved garment order expectations. National Bureau of Statistics data shows recent recovery in the textile and apparel industry, with export order indices in expansion territory for several consecutive months, providing fundamental support for filament demand.
Notably, year-on-year gains for polyester filament exceed 20% - POY +24.25%, DTY +21.66%, FDY +21.81%. Such high annual increases mean absolute prices are at multi-year highs even if weekly gains are modest. For fabric mills, this implies rising gray cloth costs with limited room to raise final product prices, squeezing margins.
Acrylonitrile's decline may transmit positive effects downstream. Products like acrylic yarn and ABS resin, which use acrylonitrile as a key feedstock, could see cost relief. However, transmission lags, and downstream demand for acrylonitrile is weak, so short-term benefits may be limited. For buyers, sustained weakness in acrylonitrile could signal lower procurement costs for related chemical fiber products.
Market Expectations and Operational Strategies
Historically, September marks the start of the traditional peak season in textiles, with raw material prices tending to rise. This week's polyester filament gains may indicate an early start to the peak season. However, PTA's decline adds uncertainty - without strong feedstock cost support, the sustainability of filament price increases is questionable. If PTA continues falling, filament gains may narrow or reverse.
Meanwhile, cotton-based products were stable: cotton yarn 21S and 32S were unchanged, while lint cotton edged up 0.06%. This suggests the cotton market is in a wait-and-see mode, pending new crop arrivals and clearer downstream orders. Viscose staple fiber and rayon yarn rose modestly, reflecting balanced supply-demand in the viscose chain. Overall, divergence among chemical fiber, cotton, and viscose indicates no broad-based rally; individual varieties will follow their own fundamentals.