1. Crude Oil Plunges as Petrochemical Cost Anchor Loosens
Oil prices experienced the sharpest correction of the current conflict cycle on May 20. Reports of the US extending its ceasefire with Iran and advancing peace negotiations improved prospects for the Strait of Hormuz, rapidly unwinding the shipping-risk premium. WTI July fell $5.89 to $98.26/bbl, down 5.66%; Brent July fell $6.26 to $105.02/bbl, down 5.63%. Both benchmarks have retraced approximately $10/bbl from mid-May highs.
Key Price Movements
| Commodity | Price | Change |
|---|---|---|
| WTI Crude (July) | $98.26/bbl | -5.66% |
| Brent Crude (July) | $105.02/bbl | -5.63% |
| SC Crude 2607 | 682.8 RMB/bbl | +9 RMB/bbl |
| Ethylene | - | Top 3 decline |
| Naphtha | - | Top 3 gain |
| PP Filament | 9,670 RMB/mt | +1.26% vs. early May |
| PP Fiber | 9,937.5 RMB/mt | +1.53% vs. early May |
Logic Behind Onshore-Offshore Divergence
- Geopolitical premium unwinding:US-Iran negotiations progressing beyond expectations, Strait of Hormuz shipping risk declining sharply. The 15-20 USD/bbl risk premium is being repriced, with 5-8 USD further downside potential.
- SC diverges from international benchmarks:Domestic SC crude gained, reflecting RMB-denominated asset resilience and refinery procurement demand.
- Ethylene leading declines:Among 42 monitored products, 18 declined with ethylene in the top three. Naphtha bucked the trend due to Asian cracker maintenance season supply tightness.
2. Downstream Plastic Resins: Transmission Lag
Current PP filament quotes at 9,670 RMB/mt and PP fiber at 9,937.5 RMB/mt still show 1.2-1.5% gains versus early May, indicating geopolitical premium support has not fully dissipated. However, as crude anchors shift lower, polyolefin cost support will gradually weaken. Naphtha counter-trend strength provides a partial buffer. Oil-based PE should feel cost pressure within 1-2 weeks.
3. Market Outlook
This plunge is a repricing of geopolitical premium rather than a fundamental reversal. Global crude inventories remain at historic lows and OPEC+ compliance stays firm. WTI should find support at $92-95/bbl. Polyolefins face near-term downward pressure, PP likely retreating to 9,400-9,500 RMB/mt, though naphtha strength will limit the decline. Multiple PDH units coming online in Q3 could add new downward pressure on PP costs.
