Lead: The Strait of Hormuz blockade has escalated from a geopolitical risk to a material supply shock. WTI surged 11% this week above $105, while Brent topped $109. However, 80 out of 109 monitored chemical products declined (73.4%), indicating a clear breakdown in the cost transmission chain.
I. Crude Oil: Hormuz Blockade Becomes Reality
WTI June climbed to $105.66/bbl (+4.44% daily, +11% weekly). Brent July settled at $109.24/bbl (+3.33%, +8.1% weekly). This is the sharpest weekly gain of 2026.
Key Price Data
| Contract | May 15 Close | Daily | Monthly | YoY |
|---|---|---|---|---|
| WTI Crude Jun 2026 | $105.66/bbl | +4.44% | +11.59% | +70.50% |
| Brent Crude Jul 2026 | $109.24/bbl | +3.33% | +9.91% | +67.01% |
Supply Disruption Analysis
- Physical Strait closure: Tanker traffic minimal; only a handful of vessels have left the Persian Gulf since conflict began
- IEA warning: Oil markets may remain severely undersupplied through October even if ceasefire reached next month
- Inventory depletion: Global oil stocks declining consecutively; floating storage nearly exhausted
- Geopolitical complexity: Trump sent mixed signals on Hormuz openness
II. Chemicals: 73% Decline Despite Oil Rally
Sci99 weekly data (May 8-14): 80 out of 109 monitored products declined (73.39%).
Worst Performers
| Product | Weekly | Logic |
|---|---|---|
| Liquid Chlorine | -28.57% | Sharp demand contraction |
| Flexible Foam PPG | -14.29% | Weak polyurethane end-use demand |
| Propylene Oxide | -10.00% | Cost pass-through failed |
Top Gainers
| Product | Weekly | Driver |
|---|---|---|
| Toluene | +5.34% | Blending demand + reduced imports |
| Diethylene Glycol | +4.91% | Polyester chain cost support |
| Calcium Carbide | +4.35% | Supply tightening |
III. Why Cost Transmission Is Breaking Down
- Refining margins compressed: Fuel price adjustments lag, squeezing refinery margins, reducing naphtha output
- Petrochemical firms constrained: Downstream plants resist high feedstock prices; PE supply rising
- End-user pressure: US CPI +3.8% YoY; manufacturing margins squeezed
IV. Outlook
Crude: WTI likely tests $108-110. Medium-term: ceasefire could trigger rapid correction to $95-100.
Chemicals: Cost support vs demand suppression dynamic persists. Zibo index fell to 864.08.
Plastics: PE, PVC range-bound. Watch cost-driven opportunities but beware demand collapse risk.
