The upstream and downstream of the chemical fiber chain are playing completely different price scripts. According to industry public data for the 27th week of 2026, PTA led the textile sector with a 2.25% weekly gain, while acrylonitrile plunged 4.20%, becoming the biggest loser of the week. Polyester filament yarns weakened across the board, with FDY and DTY falling 1.68% and 1.28% respectively.
Divergence Between Upstream Raw Materials and Downstream Products
PTA's strong rebound is not an isolated event. Its year-on-year increase has reached 21.80%, second only to spandex's 21.09% in the textile sector. This is driven by upstream PX cost support combined with short-term supply tightening due to maintenance at some plants. However, it is worth noting that downstream polyester filament yarns in the same polyester chain failed to follow the rise—FDY, DTY, and POY all closed lower, with declines ranging from 0.77% to 1.68%. This pattern of "raw materials rising, finished products falling" means that processing margins for polyester plants are being rapidly squeezed.
Acrylonitrile's deep drop is even more striking. The 4.20% weekly decline pulled its price from 9,533 yuan/ton to 9,133 yuan/ton. Although the year-on-year increase remains 15.61%, the short-term downward slope has prompted downstream acrylic fiber and ABS resin manufacturers to slow their purchasing pace. Acrylonitrile's weakness is directly linked to expectations of new capacity additions in the near term and sluggish downstream demand, with market sentiment turning bearish.
Cotton and Viscose Remain Relatively Stable
Compared to the volatility in the chemical fiber sector, the cotton textile chain showed rare stability. Cotton yarn 32S edged up 0.61%, cotton yarn 21S rose 0.28%, while raw cotton fell slightly by 0.92%. The narrow fluctuations in cotton yarn suggest that downstream weaving mills are mainly purchasing on a need-to basis, without panic stockpiling or dumping. Viscose staple fiber and spandex prices were flat week-on-week; viscose staple fiber is up 9.06% year-on-year, and spandex is up 21.09%, both in a high-level consolidation, reflecting a temporarily balanced competitive landscape between chemical fiber substitutes and cotton textiles.
Raw silk was the only natural fiber variety that fell during the week, down 0.07% week-on-week and a deep 10.07% year-on-year. The persistent weakness in raw silk is related to increased cocoon supply and a slower-than-expected recovery in silk export orders, putting pressure on inventory management for silk reeling enterprises in Guangxi, Zhejiang, and other major producing areas.
Industry Signals Behind the Price Divergence
The most noteworthy signal from this week's data is the broken price transmission within the chemical fiber chain. PTA's rise failed to effectively pass through to polyester filament yarns, instead creating cost-push margin compression. For weaving mills, this means purchasing decisions need to be more cautious—locking in PTA prices does not guarantee cost control for polyester yarn, and the decline in polyester yarn could actually stimulate short-term restocking demand.
The 0.95% rise in polyester staple fiber, contrasting with the decline in polyester filament yarn, suggests relatively stronger demand in nonwovens and filling materials compared to apparel fabrics. This structural difference hints that foreign trade companies should pay attention to shifts in end-use applications rather than just focusing on the ups and downs of bulk varieties.