Polyester filament yarn prices moved independently in the first week of September: FDY jumped 3.87% in a single day, POY followed with 3.12%, and year-on-year gains reached 27.69% and 28.68%, respectively. Yet upstream PTA fell 1.80% and acrylonitrile tumbled 4.41%. This divergence between downstream and upstream is uncommon in the recent polyester chain, suggesting that the current rally is driven by demand rather than cost. Concentrated orders from weaving mills are offsetting weak feedstock prices.
Market Snapshot
The September 7 monitoring sample covered major textile raw materials including polyester, nylon, cotton yarn, viscose, and spandex. The price board showed a clear pattern of polarization: aside from polyester filament, raw silk edged up 0.42%, while cotton yarn 21S and 32S, polyester yarn, viscose staple, spandex, rayon yarn, and all nylon specifications remained flat. Cotton lint slipped 0.06%, and polyester staple fell 0.13%. The average daily change across the sector was only 0.1%, indicating a narrow tug-of-war in the overall market.
A notable divergence emerged between polyester filament and staple. FDY, POY, and DTY rose 3.87%, 3.12%, and 0.70%, respectively, while polyester staple dropped 0.13%. Filament is mainly used in weaving, whereas staple goes into nonwovens and filling materials. This gap reflects that the current demand recovery is concentrated in apparel fabrics, not broader downstream applications. It warns against linear extrapolation of price increases.
Industrial Impact
The sharp rise in polyester filament directly impacts the cost structure of midstream weaving mills. At the current FDY price of 9403 yuan per ton, that is an increase of 350 yuan per ton from September 4. For mills purchasing thousands of tons monthly, raw material costs could rise by hundreds of thousands of yuan. Meanwhile, cotton yarn and viscose remain flat, potentially prompting some orders to shift toward pure cotton or rayon blends, especially for price-sensitive products.
The decline in upstream feedstocks weakens the cost-support narrative. PTA is still up 35.97% year-on-year, but a single-day drop of 1.80% signals ample supply; acrylonitrile's 4.41% fall directly dampens expectations for the acrylic chain. This means the polyester filament rally is not built on a solid cost foundation. Once terminal order momentum slows, the downward elasticity could be significant. For buyers, the biggest risk now is chasing high prices and overstocking.
Year-on-year data show that polyester, nylon, PTA, and acrylonitrile are generally up between 18% and 36%, while cotton yarn, viscose, and rayon yarn are up only 5% to 12%. This pattern of strong chemical fibers and weak natural fibers has persisted for months, reflecting the rising share of synthetic-fiber products in textile and apparel exports, as well as growing domestic consumer preference for functional fabrics. However, high chemical feedstock prices are squeezing profits in downstream weaving and dyeing sectors. Profit distribution along the chain is shifting from raw materials to processing stages.