When Brent crude plunged 7.3% to $81.55 per barrel on the morning of August 3, and WTI slipped below $80, the usual script for the chemical fiber chain would be 'upstream collapse, downstream follow.' But this time, polyester filament yarn prices barely moved, with daily changes generally limited to 50-100 yuan per ton. This divergence is not accidental; it signals a 'decoupling experiment' underway in textile raw materials.
Event Background
The immediate trigger for this oil price crash was geopolitical tension. On July 31, signals from the U.S. about a potential strike on Iranian energy facilities heightened market anxiety; however, by August 2, the tone shifted, claiming an agreement on the Strait of Hormuz and plans for talks with Iran the next day. Within three days, oil prices swung violently, posting one of the steepest daily drops recently.
The problem is that the market has seen this 'Trump-style' reversal many times. Since the U.S.-Iran conflict began in late February, oil prices have been driven by policy statements, with capital reacting each time, but the sensitivity of the physical economy is diminishing. Polyester filament yarn is direct evidence—it rose modestly when upstream surged, and fell slightly or stayed flat when upstream crashed.
Industry Impact
The reason polyester yarn can move independently lies in supply-demand fundamentals, not cost transmission. During the current off-season, downstream weaving mills are operating at less than 50% capacity, with many factories reducing or halting production due to lack of stable orders. Under these conditions, polyester purchases are almost entirely for just-in-time replenishment, insensitive to small price swings, and unlikely to panic-buy just because oil drops sharply in a day.
More critically, inventory cycles are changing. Massive output cuts in the first half of the year have reduced average grey fabric inventories by more than 10 days compared to last year. This means that once downstream demand picks up, existing stocks may not support the first wave of buying. Grey fabric prices often start rising when depletion is anticipated, not after actual depletion, which would then pull polyester yarn upward.
Therefore, in the short term, oil is likely to remain volatile, and polyester yarn will continue to fluctuate narrowly. But time is the biggest variable. By late August, if seasonal demand recovers, coupled with the buffer effect of low grey fabric inventories, the raw material market may see a price recovery driven by restocking. For buyers, this could be the window to observe and position.