A 4.37% single-day surge in nylon POY prices on September 8, 2026, alongside year-on-year gains approaching 30%, has added new uncertainty to an already volatile chemical fiber market. The same day saw nylon FDY and DTY rise 3.18% and 3.06%, respectively, while acrylonitrile fell 2.31%. This divergence between upstream and downstream prices is not a simple supply-demand story but a classic signal of profit redistribution along the industrial chain.
Data Signals from the Industrial Chain
Looking at the full data for the day: nylon POY was quoted at 15,525 yuan/ton, nylon FDY at 17,825 yuan/ton, and nylon DTY at 17,520 yuan/ton, with year-on-year increases of 28.84%, 19.63%, and 22.35%, respectively. PTA strengthened to 6,606.5 yuan/ton, up 2.52% daily and 39.97% year-on-year. Polyester staple and FDY also posted modest gains.
On the other side, acrylonitrile dropped 2.31% to 10,583.33 yuan/ton, viscose staple fell 0.14%, and cotton declined 0.04%. Raw silk, cotton yarn, and spandex remained flat, creating a pattern of "chemical fiber strong, natural fiber weak." The overall average daily change for the textile sector was 0.66%, indicating heightened volatility.
This divergence is not coincidental. The raw material for nylon, caprolactam, has been in tight supply recently, coupled with increased pre-holiday stockpiling by downstream weavers, driving prices up rapidly. The decline in acrylonitrile stems from expectations of new capacity coming online and supply recovery after maintenance. The divergence between upstream and downstream prices means that nylon producers' profit margins are being squeezed—raw materials rise without their products following suit, a well-known industry fact.
Impact on Procurement and Production
For weaving enterprises, the rapid rise in nylon prices directly increases production costs. For example, nylon POY rose 650 yuan/ton in a single day. For a factory using 100 tons per month with a typical 30-day inventory cycle, monthly raw material costs would increase by nearly 200,000 yuan. More critically, nylon prices are already at historical highs, with year-on-year gains near 30%, while downstream apparel orders have limited pricing power, squeezing profits from raw materials to fabrics.
PTA's continued strength is also noteworthy. With a year-on-year increase of nearly 40%, the cost center of the polyester chain has shifted significantly upward. For exporters relying on polyester fabrics, if the RMB exchange rate remains stable, overseas clients may resist price increases, further narrowing order profit margins. In contrast, the slight declines in viscose staple and cotton provide a relatively moderate cost environment for manufacturers using natural fibers, though the fundamental supply-demand dynamics for these varieties have not changed drastically.
It is worth noting that raw silk prices fell 8.04% year-on-year, contrasting sharply with the strength of chemical fibers. This reflects ample supply from sericulture and weak demand for silk apparel downstream. For home textile and apparel companies, increasing the proportion of natural protein fibers like silk in raw material procurement could hedge against rising chemical fiber costs.
Price Expectations and Operational Strategies
Historically, sharp rises in nylon prices are often followed by consolidation or pullbacks. Caprolactam operating rates are already high, and unless supply contracts significantly, the sustainability of nylon price increases is questionable. PTA may maintain high-level fluctuations in the short term, influenced by international oil prices and PX supply, but further substantial upside is limited.
The downtrend in acrylonitrile may extend in the short term, as new capacity releases intensify market competition, potentially benefiting downstream acrylic fiber producers. The weakness in viscose staple and cotton may persist until the peak of the new cotton harvest, when supply pressure becomes more apparent.