The September 7 commodity monitoring data revealed a striking divergence: polyester filament yarns collectively strengthened, with FDY up 3.87% and POY up 3.12% daily, while year-on-year gains reached 27.69% and 28.68% respectively. Meanwhile, upstream acrylonitrile plunged 4.41% and PTA fell 1.80%. This ice-and-fire pattern between upstream and downstream is rare in recent chemical fiber markets, reflecting supply-demand mismatches and temporarily blocked cost transmission mechanisms.
Market Snapshot
Specifically, polyester FDY was quoted at 9,403.33 yuan/ton, POY at 9,080 yuan/ton, and DTY at 10,122.14 yuan/ton, all up over 24% year-on-year. In contrast, PTA prices stood at only 6,444.25 yuan/ton—still 35.97% higher annually but down 1.8% on the day, eroding processing margins. Acrylonitrile dropped 500 yuan/ton to 10,833.33 yuan/ton, marking one of the steepest daily declines. Cotton yarn, viscose staple fiber, and spandex remained flat, indicating that market attention is highly concentrated in the polyester chain.
From an industrial belt perspective, operating rates in the Jiangsu-Zhejiang polyester hubs remain high, but polyester plants' raw material inventories are generally low. The surge in polyester filament prices stems partly from a rebound in crude oil and partly from concentrated restocking by downstream weaving mills ahead of the 'golden September and silver October' season. However, the declines in PTA and acrylonitrile suggest that upstream capacity release pressures have not dissipated. In particular, the accelerating commissioning of new acrylonitrile capacity may benefit downstream sectors like acrylic fiber and ABS, but could also intensify price competition.
Industry Implications
The divergence between polyester filament and raw materials carries distinct signals for each chain segment. For weaving mills, higher FDY and POY prices will passively raise greige fabric costs. If terminal orders cannot absorb the increase, profit margins will face dual compression. Data show that cotton yarn 21S and 32S prices were flat, with annual gains of only about 7%, far below the nearly 30% rise in polyester filament. This suggests a temperature gap in demand momentum between cotton and chemical fiber, prompting buyers to be more cautious in raw material selection.
More alarming is the acrylonitrile crash. Although still 33.74% higher year-on-year, the 4.41% single-day drop indicates a rapid shift in market expectations. Downstream sectors such as acrylic fiber and ABS resin may enjoy cost dividends, but they must also guard against rebound risks from upstream production cuts. The weakening PTA directly benefits polyester filament processing spreads—based on current prices, the spread between POY and PTA has widened to 2,636 yuan/ton, up nearly 200 yuan from last week, providing a favorable profit window for polyester plants.
From a macro perspective, this price structure suggests the chemical fiber industry is transitioning from 'cost-driven' to 'demand-verification' mode. The sustainability of polyester filament strength depends on actual order placements in apparel and home textiles; the weakness in acrylonitrile and PTA reflects concerns about new capacity in the second half of the year. For foreign trade enterprises, exchange rate fluctuations and freight costs remain variables, but relatively low raw material prices may offer some buffer for order taking.