On September 7, 2026, commodity price monitoring showed that polyester FDY rose 3.87% in a single day, POY rose 3.12%, while PTA fell 1.80% and acrylonitrile dropped 4.41%. This rare divergence between raw materials and finished goods reveals a subtle shift in the pricing logic of the supply chain.
Price Divergence: Signals from Raw Materials and Finished Goods
On that day, polyester FDY was quoted at 9,403.33 yuan/ton, up 350 yuan from September 4; POY rose 275 yuan to 9,080 yuan/ton; DTY increased modestly by 0.70%. Meanwhile, PTA slipped from 6,562.25 to 6,444.25 yuan/ton, and acrylonitrile fell 4.41% to 10,833.33 yuan/ton. Polyester staple fiber dipped 0.13%, while cotton yarn, viscose staple fiber, and spandex held steady.
This combination of rising polyester filament and falling upstream raw materials is uncommon. Typically, polyester prices follow PTA, but this divergence suggests that cost is not the sole determinant. More likely, maintenance shutdowns or low inventory in the filament segment tightened supply, pushing prices up independently.
Year-on-Year Data: Structural Pressures Behind High Gains
Over a longer horizon, polyester FDY is up 27.69% year-on-year, POY up 28.68%, and DTY up 24.01%; PTA has surged 35.97%, and acrylonitrile is up 33.74%. Even with recent pullbacks, raw material prices remain historically high. Cotton yarn 21S is only up 7.40%, viscose staple fiber up 11.50%, and rayon yarn up 6.68%—the wide disparity in gains highlights an uneven distribution of profits across the chain.
High year-on-year gains mean downstream weaving mills face significant cost pressure. If end-demand cannot keep pace, profit margins will be squeezed, and some small and medium enterprises may be forced to cut production or switch products.
Industry Impact: Adjusting Procurement Strategy and Inventory Management
For buyers, chasing the rally after a single-day jump is risky. If maintenance ends or inventories replenish, prices may correct. We suggest buyers monitor PTA and MEG trends; if raw materials continue to weaken, filament prices lack cost support, and procurement can be delayed.
For exporters, high and volatile raw material prices directly affect export quotations. Recent RMB exchange rate fluctuations could further impact order profitability. Exporters should include price adjustment clauses linked to raw material costs in long-term contracts to hedge against sharp cost swings.