Polyester Filament Yarn Sales Jump 60 Percentage Points in One Day: An Inventory Shift Fueled by Crude Oil

On July 8, the polyester filament yarn market experienced an anomalous sales peak. The average sales-to-production ratio of sample enterprises surged from 42.9% the previous trading day to 103.6%, a single-day jump of over 60 percentage points. This number stands out sharply in what is typically a slow season—but the real question is not 'how much it rose,' but 'why it rose' and 'how long it can last.'

Cost-Driven Pulse Restocking

The sharp rebound in the sales-to-production ratio was directly triggered by synchronized price increases in upstream crude oil and polyester raw materials. The pricing logic of the polyester chain has always been 'cost plus processing profit.' When crude oil moves, the entire chain's expectations are quickly reassessed. On July 8, downstream weaving mills and traders, driven by a 'fear of price increases,' rushed into the market to purchase, pushing the ratio above the 100% threshold.

However, a closer look at the day's published data reveals a stark divide: leading enterprises reported ratios of 150%-300%, while some small and medium-sized factories saw only 10%-40%. This extreme polarization indicates that the market is not broadly recovering; instead, capital and orders are concentrating on top-tier suppliers. Factories with ratios below 50% essentially did not benefit from this rally.

Inventory 'Relocation' from Upstream to Downstream

A ratio above 100% means that daily shipments exceeded production, leading to a decline in enterprise inventory. However, this inventory was not absorbed by end consumption; it was transferred to the warehouses of downstream weaving mills. Public data from China's textile industry shows that the operating rate of looms in the Jiangsu-Zhejiang region remains around 65%, with no simultaneous uptick. The fundamental weakness in end-demand orders has not changed.

This means that the sales peak on July 8 was a typical 'midstream inventory relocation'—upstream polyester factories destocked, while downstream weaving mills restocked. Once crude oil's rally slows or raw material prices stabilize, downstream purchasing enthusiasm will quickly fade, and the ratio will fall back to low levels. At that point, polyester factories will face even greater inventory pressure, as downstream companies already have sufficient raw material reserves to last for a while.

Reactions from Industrial Clusters like Shengze and Changxing

From a regional perspective, traders in major polyester filament yarn production and sales areas such as Shengze, Changxing, and Xiaoshan reacted most actively. Weaving mills in these regions, which primarily produce conventional chemical fiber fabrics, are highly sensitive to raw material price fluctuations. On July 8, some traders even engaged in 'panic buying,' but this was mainly concentrated on conventional varieties like POY and FDY, while transactions for differentiated products like DTY were relatively subdued.

This phenomenon reflects the real demand structure downstream: inventory of conventional products is high, while demand for differentiated products is stable but with limited incremental growth. The restocking behavior of buyers is more tactical—'locking in prices'—rather than strategic 'stockpiling.'

Practical Recommendations for Buyers and Factories

For Buyers - Current raw material prices are above the cost support level. The risk of chasing high prices for restocking is significant. It is recommended to maintain 1-2 weeks of routine inventory and avoid concentrated purchasing during sales pulses. - Monitor the continuous trend of crude oil futures. If WTI crude breaks through the $80/barrel mark, consider moderately increasing stockpiles. If it falls below $75, suspend purchases and wait for a pullback. - Prioritize cooperation with suppliers whose sales-to-production ratio is consistently above 80%; such companies have stronger price pass-through capabilities and more stable supply.

For Polyester Factories - The sales peak on July 8 is not sustainable. Use this window to accelerate destocking rather than hoarding goods and raising prices. The core contradiction is currently 'inventory reduction,' not 'profit maximization.' - The low ratio for differentiated products indicates limited downstream acceptance of high-priced differentiated raw materials. Avoid blindly raising quotes for differentiated products. - Monitor changes in weaving mill operating rates: if the rate falls below 60% in the next two weeks, it means further deterioration in end-demand orders, and polyester factories should prepare for production cuts in advance.