The ongoing U.S.–Iran conflict, now entering its third week, continues to inject volatility into global energy markets. The strategic pressure point remains the Strait of Hormuz, through which roughly 20 million barrels per day of crude oil and LNG shipments typically pass.
Concerns over tanker security and maritime disruptions initially pushed Brent and WTI crude above USD 119/bbl before partial retracement. Despite the pullback, oil prices remain structurally elevated and volatile, maintaining a significant geopolitical risk premium.
Through the crude oil → naphtha → aromatics transmission chain, this shock has rapidly filtered into China’s benzene and toluene markets, sharply tightening the MDI/TDI cost structure.
Benzene and Toluene Post Double-Digit Gains
Since early March, China’s benzene prices have surged from approximately CNY 6,100/ton to over CNY 8,500/ton — an increase of nearly 40%. Toluene followed a similar trajectory, climbing roughly 45% over the same period.
Such synchronized gains reflect both cost-push inflation and speculative risk pricing.
Given that:
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Benzene is the primary upstream feedstock for MDI
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Toluene is the direct precursor for TDI
the rapid escalation has immediately tightened production margins across the polyurethane value chain.
The magnitude of the aromatics rally confirms that the current movement is not purely sentiment-driven — it is fundamentally anchored in crude-linked cost inflation.
Why Benzene Is More Sensitive Than Toluene
Although both belong to the BTX aromatics complex, benzene and toluene exhibit different structural dynamics in China.
Benzene
China remains partially import-dependent, with import reliance around 15%. Annual imports in recent years have ranged between roughly 4–5 million tons, largely sourced from regional Asian producers. At the same time, rapid downstream expansions in styrene and caprolactam have kept domestic supply relatively tight despite large production capacity.
When crude prices rise and shipping routes tighten, import replenishment becomes more difficult, amplifying domestic price sensitivity.
Toluene
In contrast, China’s toluene market is structurally oversupplied. Import dependence has fallen to minimal levels, and the country is a net exporter. Integrated refining capacity and coal-chemical production routes provide strong supply resilience.
However, oversupply does not fully shield toluene from price spikes — for three key reasons:
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Both benzene and toluene share a common naphtha-based cost foundation.
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Widespread toluene disproportionation converts toluene into benzene; when benzene commands a strong premium, refiners increase operating rates, tightening toluene availability.
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Traders often treat BTX aromatics as a unified sector, leading to synchronized speculative activity during geopolitical events.
As a result, even a structurally long toluene market can experience sharp upward moves when crude risk premiums expand.
Cost Chain Impact on MDI and TDI
The aromatics surge has quickly translated into higher polyurethane production costs.
TDI Chain
TDI production depends directly on toluene through nitration and subsequent phosgenation processes. Therefore, TDI is particularly sensitive to rapid toluene price increases. Rising toluene costs have compressed margins quickly, prompting domestic producers to signal upward pricing adjustments.
MDI Chain
MDI production follows the benzene → nitrobenzene → aniline → MDI pathway. Although integrated aniline production in China provides partial cost buffering, benzene’s near-40% surge has materially lifted the MDI cost base.
Overall, industry estimates suggest MDI and TDI margins have contracted significantly compared with late February, as feedstock increases outpaced finished product adjustments in the early phase of the rally.
Downstream Response: Resistance and Caution
Downstream polyurethane sectors — including flexible foam, coatings, CASE applications, and elastomers — are now facing growing cost pass-through pressure.
High raw material volatility is creating two contrasting behaviors:
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Purchasing hesitation at elevated levels
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Preventive stocking among rigid-demand buyers
If crude remains elevated, downstream manufacturers may temporarily slow procurement cycles while waiting for greater price clarity. However, any renewed escalation in Middle East tensions could quickly reignite panic buying.
The market is therefore entering a phase of high-level oscillation rather than linear expansion.
Outlook: Elevated Volatility Into Q2
In the short term, crude oil risk premiums remain the dominant variable.
If tanker traffic through the Strait of Hormuz gradually normalizes before late April, aromatics prices could retrace part of their recent gains. A correction of 15–25% in benzene and toluene would materially ease cost pressure on MDI and TDI producers.
However, if geopolitical tensions extend into the second quarter and crude oil strengthens further, additional upside cannot be ruled out. In that case:
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Benzene may test new highs
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Toluene could break above recent resistance levels
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Polyurethane producers may accelerate cost pass-through
Key indicators to monitor include:
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Daily tanker flows through the Strait of Hormuz
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Asian benzene export movements
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Domestic toluene disproportionation operating rates
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Inventory levels of aniline and TDI
Structural Takeaway for the MDI/TDI Industry
China’s refining integration and coal-chemical expansion have strengthened domestic supply resilience. Yet crude oil remains the fundamental anchor of the aromatics cost structure.
The current geopolitical episode once again highlights:
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The import sensitivity of China’s benzene market
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The tight arbitrage linkage between benzene and toluene
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The vulnerability of the MDI/TDI cost chain to external shocks
For polyurethane producers, the first half of 2026 is likely to be defined by elevated feedstock volatility and increasingly divergent downstream demand. Active feedstock risk management, inventory control, and margin protection strategies will be critical in maintaining competitiveness under this new pricing regime.
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