In the last trading week of August 2026, the textile bulk commodity market offered a telling snapshot: only three products rose month-on-month, with raw silk leading at 2.67%, followed by PTA and cotton at 0.59% and 0.51%, while the remaining 13 monitored products stayed flat. The daily change seems calm, but year-on-year data hides deeper currents—acrylonitrile, PTA, and polyester filament series all rose over 20%, while raw silk fell 9.16%. This mix of flat short-term movement and sharp annual divergence reveals the core tension: strong cost expectations versus weak demand reality.
Market Background
A single-day price move is often dismissed as noise, but silk's 2.67% jump deserves attention. As a direct product of cocoon processing, silk prices are highly sensitive to supply disruptions, especially during the gap before autumn cocoon harvest. Weather in producing areas and farmer hoarding sentiment can amplify price swings. In contrast, PTA and cotton gains follow cost logic—higher crude oil lifts PX, which pushes PTA, while cotton is supported by tight supply before new crop arrival. Notably, all other products were flat, indicating buyers are not chasing prices, and the market remains in wait-and-see mode.
Year-on-year, the divergence between chemical-fiber and natural-fiber chains is stark. Acrylonitrile rose 44.12%, PTA 26.54%, and polyester POY, FDY, DTY all increased over 21%, while cotton yarn and viscose yarn rose only about 5%, and silk fell. This suggests chemical fiber chains transmit costs smoothly, while natural fibers face weak end-demand, limiting price upside.
Industry Impact
For upstream mills, high annual gains in chemical raw materials are squeezing profit margins. For example, while polyester filament prices rose about 22% year-on-year, if PTA gains match or exceed that, actual processing spreads may not improve. Public industry data shows PTA processing fees are at mid-to-low historical levels, meaning polyester plant profitability depends more on downstream demand than cost pass-through. For viscose staple and spandex, annual gains of 10%-21% have not been matched by demand, risking 'price without volume'.
For buyers and exporters, silk's move is particularly notable. As a core raw material for high-end fabrics, a 2.67% single-day jump may signal worse-than-expected autumn cocoon supply, raising silk fabric costs. Given silk is still down 9.16% year-on-year, this could be a rebound, but with weather disruptions in major cocoon regions, the risk of a trend is building. Meanwhile, PTA's moderate rise directly impacts weavers—polyester fabrics account for over 60% of Chinese fabric exports, and each 1% PTA cost increase shrinks weaver gross margins by about 0.3 percentage points, with a 2-4 week pass-through lag to export quotes.