The final week of August 2026 delivered a telling signal from the textile commodity price board: polyester filament products led gains with around 2% weekly increases, while upstream raw materials like acrylonitrile and PTA fell sharply by 4.46% and 3.67% respectively. On the same industrial chain, downstream processed goods and upstream base materials moved in opposite directions, with the weekly average change at only 0.03%, indicating a silent redistribution of profits.
Price Divergence: Polyester Strength vs. Raw Material Weakness
Among the 17 monitored textile categories, 10 rose, 3 fell, and the rest were flat. The top three gainers were all polyester filament: polyester POY rose 2.00% to 8,767.50 yuan/ton, DTY gained 1.76% to 9,930.71 yuan/ton, and FDY increased 1.70% to 8,970.00 yuan/ton, all with year-on-year gains exceeding 21%. In contrast, acrylonitrile plunged 4.46% to 11,433.33 yuan/ton, PTA dropped 3.67% to 6,213.25 yuan/ton, and polyester staple fiber fell 0.96%. Notably, acrylonitrile is still up 44.12% year-on-year, meaning the absolute level remains far above last year despite the weekly correction.
This pattern of downstream rising and upstream falling suggests profit is shifting from raw materials to processing stages. For polyester filament producers, lower PTA costs and firm product prices theoretically expand processing margins; however, acrylonitrile's volatility pressures the acrylic and ABS-related chains.
Industrial Transmission: Supply-Demand Mismatch and Inventory Cycles
The counter-trend rise in polyester filament is closely tied to downstream weaving mills' restocking demand. Late August is the prelude to the traditional 'golden September and silver October' peak season, when weavers typically stock up. Concentrated demand for polyester filament pushed prices up. Meanwhile, the declines in PTA and acrylonitrile reflect ample upstream supply or weak demand. PTA's weekly drop of 3.67% still leaves it 26.54% higher year-on-year, suggesting a technical correction after excessive gains; acrylonitrile's plunge may relate to new capacity coming online or low operating rates in acrylic fiber plants.
This divergence has profound transmission effects. On one hand, rising polyester filament prices will gradually pass to greige fabrics and finished fabrics, squeezing weavers' profits. On the other, low PTA prices help maintain high margins for polyester filament but may stimulate additional capacity, exacerbating future oversupply risks. For buyers, chasing high polyester prices is risky; for upstream suppliers, acrylonitrile's plunge may trigger panic selling, but the still-high year-on-year figure means cost support remains.
Category Divergence: Nylon and Viscose Steady, Cotton Stable
Beyond polyester, nylon products recorded modest gains: nylon DTY +0.97%, nylon POY +0.86%, and nylon FDY +0.29%, with year-on-year increases between 14% and 21%. Viscose staple fiber rose 0.42%, and rayon yarn gained 0.69%, indicating a decent environment for regenerated cellulose fiber chains. Raw silk rose 0.85% but is down 9.16% year-on-year, signaling the sericulture industry remains at a cyclical bottom. Cotton products were stable: cotton lint edged up 0.06%, cotton yarn 21S and 32S were flat, polyester yarn flat, and spandex unchanged. The relative stability of the cotton chain is linked to national reserve policies and steady downstream orders.
This category divergence highlights varying prosperity across segments. The sharp contrast between booming polyester filament and flat cotton yarn underscores ongoing fiber substitution; raw silk's year-on-year decline warns of structural demand erosion for traditional natural fibers.
Practical Recommendations
Given the current price divergence, players across the chain should adjust strategies based on their positions.
For Buyers - Polyester filament prices are high; consider phased purchasing to avoid peak-season cost spikes, and watch for cost transmission windows from falling PTA. - Acrylonitrile has plunged but remains high year-on-year; be cautious about bottom-fishing, monitor new capacity schedules, and sign long-term contracts to lock in prices.
For Exporters - Polyester fabric export quotes can be moderately raised, but assess customer acceptance; use FX hedging to manage currency fluctuations. - Monitor import cost changes for acrylonitrile downstream products (e.g., acrylic yarn) and adjust sourcing to avoid volatility risks.
In summary, the divergent textile raw material market reflects both supply-demand fundamentals and speculative forces. In the coming weeks, as peak-season demand materializes and upstream capacity evolves, price trends may see new turning points. Industry participants must remain vigilant.