The price gap between chemical fibers and cotton yarn is widening at a visible pace. In week 38 of 2026, PTA led the textile sector with a weekly gain of 1.39%, while viscose staple fiber and polyester POY rose modestly by 0.41% and 0.40% respectively. Over the same period, cotton yarn 21S and 32S fell 1.27% and 1.20%, and polyester FDY dropped 1.57% to lead the declines. The sector's average weekly change was just -0.11%, but the internal divergence is far more dramatic than that figure suggests.
Cost Push vs. Demand Pull
PTA's strength is no isolated event. Its year-on-year gain stands at 54.21%, meaning current prices are more than half higher than a year ago. This reflects upstream PX cost support and sustained high operating rates across the polyester chain. Polyester POY is up 34.96% year-on-year and DTY up 31.46%, confirming that cost-push dynamics remain intact in the chemical fiber complex.
Yet this cost pressure has not transmitted smoothly downstream. Polyester staple fiber fell 0.56% for the week; while still up 33.75% year-on-year, it was among the weakest performers in the chemical fiber group. More notably, cotton yarn remains sluggish—21S and 32S are up only 5.89% and 5.31% year-on-year, a stark contrast to the 30%-plus gains seen in chemical fiber varieties. This means cotton price increases have been largely diluted at the yarn stage, squeezing spinning mill margins.
Cotton lint edged down 0.02% for the week and is up 15.18% year-on-year, well below PTA and polyester gains. The narrowing raw material spread between cotton and chemical fibers should theoretically help cotton yarn competitiveness recover, but yarn prices fell instead—pointing to demand-side weakness rather than raw material issues.
Divergence Signals Across Industrial Belts
By category, all five gaining varieties this week were in chemical and regenerated fibers, while cotton yarn took two of the five declining slots. This distribution reveals a transmission blockage: upstream chemical raw materials are supported by energy and chemical prices, but midstream yarn producers cannot pass through costs due to insufficient end-user orders.
Raw silk was flat for the week but down 6.17% year-on-year, one of the few negative annual comparisons in the sector. Acrylonitrile is up 36.10%, spandex up 19.59%, and nylon DTY up 29.83% year-on-year, forming a clear bloc of strength against weak silk and cotton yarn. For chemical fiber fabric clusters like Keqiao and Shengze, elevated raw material costs are compressing weaving margins. For cotton textile belts like Nantong and Foshan, weaker yarn prices may actually pull some orders back toward cotton products.
Rayon yarn rose 0.27% for the week and 6.97% year-on-year, positioning between pure cotton and chemical fibers. Viscose staple fiber gained 0.41% weekly and 11.13% annually, providing cost support, but rayon yarn's inability to follow through again reflects weak bargaining power at the yarn stage.
Implications for Procurement and Export
The core contradiction is that chemical fiber raw materials have accumulated substantial year-on-year gains, yet retail prices for apparel and home textiles have not risen in tandem. Under dual pressure from exchange rates and costs, exporters are forced to shorten quotation cycles. For export orders using polyester as the primary raw material, buyers need to reassess the risk of long-term fixed-price contracts—if PTA continues to strengthen, unhedged portions will directly erode margins.
Weaker cotton yarn prices offer a substitution window for certain categories. With polyester POY up nearly 35% year-on-year while cotton yarn 21S is up less than 6%, the economics of blended ratios are shifting. Factory technical teams should recalculate polyester-cotton blend proportions to optimize raw material cost structures while maintaining finished product specifications.
For Buyers - Prioritize staggered price-locking for chemical fiber raw materials, avoiding single large long-term contracts exposed to further PTA upside - Monitor the spread between cotton yarn and polyester staple fiber; when cotton yarn value becomes evident, adjust blend ratios for blended orders accordingly - Treat the polyester FDY decline as a short-term window, but confirm supplier inventory levels before deciding on additional purchases
For Exporters - Shorten quotation validity to within two weeks and include raw material price fluctuation clauses in contracts to reduce unilateral exposure - For cotton product orders, improve quotation competitiveness to capture European and Japanese clients leveraging relatively stable cotton yarn costs - Closely watch export opportunities in silk products arising from the year-on-year decline in raw silk, but confirm whether downstream demand is recovering in tandem
Overall, week 38 data is not merely mixed performance but a revelation of profit distribution across the textile chain. If the pattern of strong chemical fibers and weak cotton textiles persists, it will accelerate downstream product structure adjustments. The speed of adaptation in procurement and export operations will directly determine profitability over the next two quarters.