The August 28 bulk commodity monitor drew a thought-provoking divergence curve for textile raw materials: raw silk surged 2.67% in a single day, PTA and cotton followed with gains of 0.59% and 0.51%, while more than a dozen other varieties remained frozen. Such a pattern is uncommon on the eve of the traditional peak season, hinting at differing expectations for the second half of the year.
Divergence in Price Movements
Raw silk jumped 2.67% to 427,500 yuan per ton, yet it remains 9.16% lower year-on-year. This contrast suggests the daily spike is more of a short-term supply-demand or sentiment shift than a trend reversal. Cocoon supply rhythms, reeling mill operating rates, and marginal changes in downstream silk fabric orders can all amplify intraday volatility. For buyers, this pulse-like rise may signal a narrowing negotiation window, but chasing the rally carries its own risks.
In contrast, PTA and cotton posted modest gains. PTA is up 26.54% year-on-year, and cotton is up 19.12%, both already at relatively high levels. PTA is closely tied to crude oil prices, PX supply, and polyester operating rates, while cotton is influenced by new-crop expectations, reserve policies, and downstream restocking. Their sustained strength is reshaping the cost base of the chemical fiber and cotton spinning chains.
Deep Trends in Year-on-Year Data
Looking at year-on-year changes, divergence becomes more pronounced. Acrylonitrile is up 44.12%, spandex up 21.65%, polyester filament yarns (POY, DTY, FDY) up 21% to 24%, and nylon series up 14% to 21%. These figures point to a common logic: upstream petrochemical cost push, coupled with capacity contraction in some segments, is driving broad profit recovery across the chemical fiber chain.
In contrast, cotton yarn (21S, 32S) is only up about 5.6% year-on-year, viscose staple fiber up 10.43%, and rayon yarn up 5.66%—significantly lagging chemical fibers. This means downstream weaving and apparel companies face asymmetric cost pressure: chemical fiber fabrics see notable cost increases, while cotton-based products rise modestly. For export-oriented textile firms, this divergence may affect pricing strategies and order mix.
Notably, 14 varieties were flat on the day, including polyester staple fiber, polyester yarn, spandex, and viscose. This broad flatness is not market apathy but a temporary balance of bullish and bearish forces. In a context of high-level volatility, mills prefer just-in-time purchasing over stockpiling.
Transmission and Response Across the Chain
The structural divergence in raw material prices is transmitting down the chain. For chemical fiber producers, high year-on-year increases in PTA and polyester filament mean rising production costs; if downstream acceptance is limited, margins may be squeezed. For cotton spinners, the modest rise in cotton and cotton yarn suggests insufficient end-demand to absorb higher cotton prices, potentially compressing spinning margins.
The raw silk anomaly reminds us that small-volume commodities have thin liquidity and are easily amplified by short-term factors. Silk exporters relying on spot purchases should be cautious of pullback risks and may consider forward contracts or term agreements to lock in costs. Meanwhile, the price gap between viscose and polyester staple fibers may prompt some blended mills to adjust raw material ratios to optimize costs.
From a foreign trade perspective, exchange rate fluctuations and the pace of overseas demand recovery remain the biggest variables. Chemical fiber raw materials up over 20% year-on-year imply that export quotes likely need upward adjustments, but whether they can be passed on to overseas clients depends on price sensitivity in end markets. Exporters should closely monitor inventory and order data in major destinations to avoid losing share through indiscriminate price hikes.