The price monitoring data for September 7, 2026, reveals an intriguing signal: polyester filament yarns surged up to 3.87% in a single day, while upstream raw materials like PTA fell 1.80% and acrylonitrile dropped sharply by 4.41%. This rare 'downstream-up, upstream-down' scissors gap implies that profit margins in the polyester segment are expanding passively, but sustainability is questionable. For buyers, chasing the rally now might step into a vacuum of cost support.
The Logic Behind Price Movements
On the gainers' side, polyester FDY was quoted at 9,403.33 CNY/ton, up 3.87% from the previous day, with a year-on-year increase of 27.69%. Polyester POY stood at 9,080 CNY/ton, up 3.12% daily and 28.68% year-on-year. Polyester DTY rose 0.70% to 10,122.14 CNY/ton, up 24.01% year-on-year. Conversely, polyester staple fiber dipped 0.13% to 8,211.50 CNY/ton. These figures indicate a divergence in market supply-demand structures between filament and staple fiber: downstream weaving operating rates are recovering notably for filament, while staple fiber end-markets (e.g., nonwovens) remain sluggish.
On the decliners' side, acrylonitrile fell from 11,333.33 to 10,833.33 CNY/ton, a daily drop of 4.41%, though still 33.74% higher year-on-year. PTA was quoted at 6,444.25 CNY/ton, down 1.80%, but up 35.97% year-on-year. The sharp fall in acrylonitrile may be attributed to the restart of maintenance units, while PTA's decline is linked to crude oil price volatility and adjusted polyester operating loads. Notably, PTA's year-on-year increase of nearly 36% means that even after the pullback, its absolute price remains historically high, continuing to pressure downstream sectors.
The Paradox of Upstream Weakness and Downstream Strength
The polyester filament price hike amid PTA decline appears to be a price increase against cost collapse. Two factors support this: first, filament prices had lagged behind raw material gains earlier, so this is a catch-up rally; second, weaving enterprises have seen order recovery, increasing their acceptance of higher filament prices. However, this divergence is unlikely to persist. If PTA continues to weaken, cost support for filament will gradually erode, and high prices may dampen downstream purchase intentions, creating a negative feedback loop.
Year-on-year data show filament prices up 24%-29%, while PTA is up about 36% and acrylonitrile about 34%. Raw material cost increases clearly outpace product price gains, implying that filament manufacturers' actual processing margins have not improved significantly; the price rise is more of a passive pass-through. For textile mills, if raw materials continue to fall, filament prices face a correction risk, and inventory devaluation should be watched.
Cross-Category Comparison: Opportunities and Risks in Divergence
Cotton yarn 21S and 32S remained flat at 23,700 and 25,100 CNY/ton, up 7.40% and 6.58% year-on-year, respectively. Cotton prices edged down 0.06% to 18,169.67 CNY/ton, indicating a weak balance in the cotton spinning chain. Viscose staple fiber was flat at 14,540 CNY/ton, up 11.50% year-on-year; spandex was flat at 29,000 CNY/ton, up 19.59%. Nylon DTY, FDY, and POY were flat at 17,000, 17,275, and 14,875 CNY/ton, with year-on-year gains between 15.94% and 23.44%.
Raw silk rose 0.42% to 431,400 CNY/ton, but it is the only major product with a negative year-on-year change (-8.02%), reflecting supply glut after the recovery of sericulture cycles. Viscose rayon yarn was flat at 18,375 CNY/ton, up 6.68% year-on-year. Polyester yarn was flat at 12,083.33 CNY/ton, up 5.90%. Overall, the chemical fiber sector shows mixed movements, but cotton, viscose, and nylon products are largely stable, indicating cautious sentiment. Only polyester filament stands out as a short-term focus.