Brief In‑depth industry update dated September 22: China’s monoethylene glycol (MEG) market has reached a fundamental inflection point after the “Golden September” peak season failed to live up to expectations. The comprehensive operating rate of downstream polyester has dropped to 74.2%, with deeper production cuts in segments such as filament yarn. Domestic ethylene‑based and coal‑to‑MEG units have restarted in batches, lifting overall supply. Major East China ports ended an 8‑week consecutive destocking streak and recorded their first mild inventory build. The main MEG futures contract closed nearly 3% lower on the day, with broad market consensus that an inventory accumulation cycle will kick off in Q4, putting sustained downward pressure on price valuations.

Market Overview On September 22, China’s domestic MEG market registered a clear trend reversal. As geopolitical risk premiums continued to fade and the “rising supply, falling demand” scissors gap in industrial fundamentals widened, the leading MEG futures contract traded lower throughout the session and closed nearly 3% down, erasing the rebound gains of the past two weeks. The spot market softened in tandem: spot negotiation prices in East China moved lower, traders showed stronger willingness to sell, and downstream buyers only placed scattered small orders for rigid demand, leaving overall market sentiment cautious.

Supply Side: Steady Recovery in Domestic Unit Utilization, Low Import Arrivals Steadily rising supply has been the core driver of the supply‑demand shift. Ethylene‑based MEG units, supported by loose upstream ethylene supply and recovering processing margins, maintained a high operating rate of over 82%, with most major facilities running at full capacity. For coal‑to‑MEG units, multiple facilities in Northwest and North China that had been shut due to losses and routine maintenance restarted intensively in mid‑to‑late September, driving a rapid recovery in coal‑based utilization. The overall national MEG operating rate rose by about 4 percentage points week on week, and domestic weekly output increased notably.

On the import side, September arrivals at East China ports remained low due to overseas unit maintenance, shipping delays and shifts in global cargo flows, with weekly import volumes down around 8% week on week. However, incremental domestic output has fully offset the import gap, resulting in a net increase in total domestic supply. More coal‑based units are scheduled to ramp up to full capacity before October, which will further intensify supply‑side pressure.

Demand Side: Failed Peak Season Expectations, Negative Feedback Spreads Along the Chain Demand weakness has deepened, and the traditional “Golden September, Silver October” consumption peak season has largely failed to materialize. The comprehensive polyester operating rate has fallen to 74.2%, lower than the usual peak‑season level for this period and even below the low running rate during the Spring Festival holiday. By segment, polyester filament yarn has seen the sharpest drop in utilization, hit by weak export orders for end‑use textiles and apparel and soft domestic demand. Staple fiber and bottle‑grade polyester have remained relatively resilient but have also reduced output to varying degrees.

Negative feedback continues to transmit along the industrial chain: end‑user weaving mills hold high grey fabric inventories and struggle to lift operating rates, which in turn squeezes polyester producers with mounting finished goods stock and shrinking processing margins. Most polyester enterprises now adopt a “purchase on demand, control raw material inventory” strategy, keeping MEG feedstock inventories at a low 10‑12 days with no willingness to restock proactively. This directly curbs actual MEG consumption, and no obvious demand recovery is expected in the short term.

Inventory Inflection: East China Ports End 8‑Week Destocking, Inventory Build Cycle Confirmed Inventory developments have officially confirmed the supply‑demand inflection point. This week, MEG stocks at major East China ports ended an 8‑week consecutive destocking trend and registered a mild build, rising by around 20,000 tonnes week on week. Although absolute port inventories remain low compared with the same period in recent years, providing some floor support for spot prices, the emergence of a build trend signals that the market has shifted from a “tight balance” to a “loosening expectation” regime.

Meanwhile, weekly port pickup volumes declined week on week, reflecting weaker purchasing willingness from downstream polyester mills and a slower pace of rigid‑demand procurement. As domestic unit output continues to rise and import arrivals are expected to gradually recover in Q4, the market widely expects port inventories to enter a sustained accumulation phase.

Cost & Margins: Diverging Profitability Across Routes, Supply Elasticity Unfolds Diverging profitability across production routes is also shaping the pace of supply growth. For ethylene‑based MEG, falling international ethylene prices have eased cost pressures and steadily restored processing margins, keeping producer incentives high. For coal‑to‑MEG, domestic thermal coal prices have stayed relatively stable, and the earlier rebound in MEG prices has narrowed losses for coal‑based units, triggering the wave of restarts and unlocking supply‑side elasticity. The weakening of cost support has also opened further downside room for MEG prices.

Outlook & Procurement Advice Looking ahead to Q4, the MEG inventory build trend is broadly established amid rising supply and soft demand, putting downward pressure on the price center. In the near term, low absolute port inventories will still provide some support for spot prices, and the market may trade in a range with a soft bias. In the medium term, as inventory accumulation deepens, price valuations will remain under pressure.

For B2B buyers and trading clients, we recommend prioritizing rigid‑demand procurement for now and exercising caution in building large inventories. It is advisable to closely monitor weekly port inventory data and polyester utilization rates, and restock in batches after the inventory trend is fully confirmed and prices fall to attractive levels. For long‑term contracts, negotiated futures‑linked pricing models can be adopted to better hedge against price volatility.