South Korea’s April Middle East Crude Imports Drop 38.2%, Pressuring MDI/TDI Feedstock Supply

On May 25, 2026, South Korea’s Customs Service released trade statistics showing a 38.2% year-on-year decline in crude oil imports from the Middle East in April 2026. This sharp reduction has lowered naphtha cracker operating rates to 71%, constraining production capacity for aniline and toluene diamine (TDA)—key upstream feedstocks for MDI and TDI. The development directly affects polyurethane raw material supply chains and warrants close attention from chemical procurement, formulation, and downstream manufacturing stakeholders.

Event Overview

According to official data published by the Korea Customs Service on May 25, 2026, South Korea imported 38.2% less crude oil from the Middle East in April 2026 compared to April 2025. As a result, naphtha cracker utilization fell to 71%. This has impacted domestic output of aniline and TDA—the primary precursors for MDI and TDI. Korean producers including OCI and Hanwha Chemical have issued advance payment letters to Chinese suppliers to secure MDI/TDI volumes, with delivery schedules now commonly extended to end-Q3 2026.

Impact on Specific Industry Segments

Raw material procurement enterprises: Reduced Middle East crude inflows have tightened domestic naphtha availability, limiting benzene and toluene derivatives production. Procurement teams face higher lead times and reduced flexibility in spot sourcing of aniline and TDA—especially for non-contracted volumes.

MDI/TDI producers and formulators: Lower cracker run rates constrain feedstock throughput, affecting batch scheduling and yield consistency. Producers relying on domestic aniline or TDA may experience delayed production cycles or increased reliance on imported intermediates—raising landed cost and logistics complexity.

Downstream polyurethane manufacturers (e.g., insulation, automotive foam, adhesives): Extended MDI/TDI delivery windows signal potential supply constraints in Q3. Formulators with just-in-time inventory models may face production planning adjustments or need to reassess safety stock levels for key isocyanate-based systems.

What Relevant Enterprises or Practitioners Should Monitor and Do

Track official energy import revisions and policy statements

Monitor subsequent monthly customs releases and any statements from Korea’s Ministry of Trade, Industry and Energy regarding diversification efforts or emergency supply measures—these may indicate whether the April dip reflects a structural shift or a transient adjustment.

Focus on naphtha-derived intermediate availability—not just crude volumes

The bottleneck lies not in crude import volume alone but in downstream conversion: watch real-time naphtha cracker load factors and domestic aniline/TDA production reports. A sustained sub-75% cracker rate suggests continued pressure on aromatic amine supply, independent of crude sourcing changes.

Distinguish between contractual commitments and operational execution

Advance payment letters from OCI and Hanwha Chemical signal intent and risk mitigation—not guaranteed supply. Verify actual shipment confirmations and port clearance data before adjusting internal production forecasts or customer commitments.

Prepare contingency plans for Q3 feedstock allocation

Given widespread delivery deferrals to end-Q3, procurement managers should review existing contracts for force majeure clauses, assess alternative regional suppliers (e.g., ASEAN-based TDA sources), and initiate early dialogue with logistics partners on container availability and demurrage exposure.

Editorial Observation / Industry Perspective

Observably, this development functions more as a near-term supply chain stress indicator than a full-blown disruption. The 38.2% drop in Middle East crude imports is notable—but its impact is mediated through refining infrastructure constraints (specifically naphtha cracking) rather than absolute feedstock scarcity. Analysis shows that the ripple effect is concentrated in the aniline→MDI and TDA→TDI conversion steps, not upstream benzene or toluene markets. From an industry perspective, the situation highlights growing sensitivity of East Asian isocyanate supply to regional refining dynamics—particularly where cracker utilization falls below operational thresholds needed to sustain aromatic amine economics.

Current developments are better understood as a logistical and scheduling challenge emerging from constrained conversion capacity—not a fundamental shortage of crude or core intermediates. That said, repeated sub-75% cracker rates over consecutive months would warrant deeper assessment of structural bottlenecks in Korea’s petrochemical integration.

Conclusion: This event underscores how shifts in crude sourcing can propagate through refining and derivative production layers to affect specialty chemical availability—even without changes in global crude prices or geopolitical supply bans. It is not yet evidence of systemic instability, but it is a validated signal of heightened vulnerability in the MDI/TDI value chain’s midstream segment. Stakeholders should treat it as a timely reminder to stress-test feedstock allocation models against refining utilization volatility—not as an isolated incident.

Source Disclosure:
Primary source: Korea Customs Service trade statistics, published May 25, 2026.
Note: Ongoing monitoring is advised for June 2026 customs data and any follow-up announcements from OCI, Hanwha Chemical, or Korea’s Ministry of Trade, Industry and Energy regarding feedstock supply stabilization measures.