In mid-August, the domestic polyester staple fiber (PSF) industry witnessed a rare collective action: major producers simultaneously cut output to offset widening losses. This move came against a backdrop of high raw material costs and weak downstream demand, squeezing processing margins to unsustainable levels. Data shows that industry operating rates reached 70.36% in July, and although spot prices hit 7,675 yuan/ton on cost support, they failed to translate into profits, making output cuts a proactive choice amid passive conditions.
Supply and Cost Dynamics
Cost-side support appears robust but is actually diverging. For PTA, delays in restarting two core units, coupled with rainfall disrupting port loading in East China, pushed spot basis close to 300 yuan/ton, with August social inventories expected to hit a 44-month low. Ethylene glycol is similarly strong: Middle East tensions and strait navigation issues slashed import arrivals, while concentrated maintenance kept operating rates low. East China port inventories fell to a 15-year low, with spot premiums reaching 540 yuan/ton in early August. Low inventories provide tangible cost support for PSF, but the risk is that September will see concentrated restarts of PTA and EG units, easing supply and weakening cost support.
This divergence means PSF producers face a volatile and uncertain raw material environment rather than a one-way rising cost curve. For buyers, the short-term tightness may persist, but they should be wary of price corrections after September restarts. For mills, relying on raw material price hikes to pass through costs is limited, as downstream acceptance is near a tipping point.
Short-term and Long-term Effects of Output Cuts
These cuts differ from passive shutdowns due to equipment failures; they represent proactive market adjustments. Leading enterprises in Jiangsu, Zhejiang, and Fujian all participate, covering mainstream direct-spun capacity. Cuts will intensify in late August, with September seeing concentrated implementation and maintenance. Industry operating rates are expected to drop from 70.36% to around 67%, reducing monthly supply by about 30,000 tons, creating a noticeable tightening in the spot market. For Keqiao and surrounding weaving clusters, changes in raw material circulation will quickly transmit to yarn trading and fabric segments, potentially easing low-price competition in the short term, but fabric price hikes face significant resistance as terminal orders remain weak.
However, the long-term effectiveness of output cuts is uncertain. Execution flexibility exists: once prices rebound and margins recover, cash-strapped enterprises may resume production. New capacity is only deferred, not canceled, and will likely be released once the industry turns profitable. More critically, demand is the fundamental constraint. August is a traditional off-season, with Keqiao's grey fabric transactions contracting, weaving mills operating at low rates, and merchants buying on a need-only basis. PSF fabric sales are mostly small and scattered orders, making it difficult for upstream price increases to transmit smoothly downstream.
Key Indicators for September Demand
Whether the "golden September" materializes depends on multiple signals converging. In the short term, from late August to early September, output cuts will stabilize and strengthen the market, with processing margins gradually recovering. In mid-to-late September, the market will oscillate between weakening costs and demand recovery, likely maintaining an upward but volatile trend. A one-way rally is unlikely, with the biggest risk being supply rebound after profit recovery, which will continue to cap margin expansion.
Market participants should track the actual implementation of major producers' cuts, upstream and downstream unit restarts, yarn mill operating rates, terminal order growth, and downstream restocking intentions. Keqiao's grey fabric transactions, weaving operating rates, and fabric export orders will be key windows to validate demand. If autumn/winter fabric orders release in September and weaving mills shift from need-based to proactive restocking, PSF purchases could rise; otherwise, the impact of output cuts will be greatly diminished.