The August 4 commodity price monitoring data sends a warning signal: acrylonitrile surged 5.25% in a single day to 12,033.33 yuan per ton, a year-on-year increase of 51.05%. Meanwhile, polyester filament FDY and POY fell 2.33% and 2.13% respectively. This divergence within the same sector is not a random fluctuation but a direct reflection of profit redistribution between feedstock and spinning segments.
Background
Among the 17 monitored textile commodities, only three rose, two fell, and the rest remained flat, with an average daily change of just 0.2%. Beneath this calm surface, acrylonitrile's 5.25% jump stands out—rare for a major textile feedstock. Its year-on-year gain of over 50% indicates a structurally tight supply-demand balance, not short-term speculation.
In sharp contrast, polyester filament prices declined: POY fell 2.13% to 8,343.75 yuan/ton, and FDY dropped 2.33% to 8,663.33 yuan/ton. Despite year-on-year gains of 21.25% and 20.93%, the short-term pullback signals downstream resistance. Polyester staple fiber, however, rose 0.41% to 7,591.29 yuan/ton, diverging from filament, reflecting stronger demand in nonwovens and filling applications.
PTA rose 2.20% to 6,159.83 yuan/ton, up 28.10% year-on-year. As the main raw material for polyester, PTA's increase should support polyester costs, yet filament prices fell, indicating squeezed margins in the polyester segment. The cost-push logic suggests polyester plants are sacrificing profits to maintain market share.
Industry Impact
Acrylonitrile's strength directly impacts acrylic fiber and ABS resin chains. Higher feedstock costs will push up acrylic fiber production costs, potentially raising acrylic yarn prices. For downstream textile mills, especially those using acrylic in woolen and knitted products, procurement cost pressure intensifies. Meanwhile, raw silk fell 9.14% year-on-year to 425,100 yuan/ton, the only declining natural fiber, contrasting sharply with chemical fibers and prompting buyers to reassess cost structures across fiber types.
The decline in polyester filament is relatively favorable for weavers. Lower POY and FDY prices directly reduce greige fabric costs, especially for shuttle and warp-knit mills using filament as primary input. However, PTA's rise may pass through to filament prices within a week, potentially closing this cost advantage window quickly.
From an inventory cycle perspective, falling filament prices often indicate weak downstream orders or destocking. With year-on-year gains still around 20%, the price base is elevated, testing weavers' cost tolerance. For exporters, heightened raw material volatility shortens quotation validity and makes price adjustment clauses critical.