I. Crude Rally Reshapes Plastic Cost Base
As of May 18 close, WTI June 2026 settled at $108.66/bbl, up $3.24 or 3.07%; Brent July 2026 at $112.10/bbl, up $2.84 or 2.60%. China SC crude futures (2607) gained 30.9 yuan/bbl to 672.3 yuan/bbl. WTI has posted three consecutive weekly gains, accumulating over 12%, firmly establishing itself above the $100 psychological threshold while pushing toward the $110 zone.
Key Energy Price Movements
| Commodity | Price | Change |
|---|---|---|
| WTI Crude (Jun) | $108.66/bbl | +3.07% |
| Brent Crude (Jul) | $112.10/bbl | +2.60% |
| SC Crude (2607) | 672.3 yuan/bbl | +30.9 yuan/bbl |
| Zibo Chemical Index | 868.81 | +0.55% |
Market Logic Analysis
- Geopolitical premium widening: Iran's foreign ministry signals no breakthrough in US-Iran negotiations, leaving approximately 21 million bpd of Hormuz Strait traffic at risk. Markets are pricing in a scenario of sustained supply curtailment that shows no sign of dissating near-term.
- Accelerating global inventory draws: Hormuz disruption fears are driving expectations for continued global stock depletion. Tight supply fundamentals combined with the approaching peak summer demand season create a powerful bullish convergence with geopolitical risk.
- Domestic cost transmission: Higher crude feeds directly into ethylene and propylene production costs via naphtha cracking, eventually reaching PE and PP resins. However, China's plastics market exhibits a "strong costs, weak demand" divergence, meaning transmission efficiency carries a discount.
II. Plastic Feedstock Gains Capped by Weak Demand
Among 42 tracked petrochemical products, 26 rose, 5 held steady, and 11 declined. PP granule and powder prices gained 25-170 yuan/tonne, while LLDPE film-grade saw isolated declines. Futures strength lifted spot sentiment somewhat, and elevated oil prices provided cost support, prompting traders to raise offers broadly. However, end-user purchasing remained predominantly just-in-time, and overall trading activity was subdued.
The core contradiction lies in simultaneously rising costs and persistently soft demand. May is traditionally a consumption lull for plastics — agricultural film demand has wound down, packaging film operating rates stay low, and downstream tolerance for elevated feedstock prices is limited. This means that even with robust cost-side momentum, upside in plastic prices will be constrained by a demand-side ceiling.
III. Outlook
WTI faces technical resistance near $110 and may consolidate after this sharp push. But geopolitical risk premia are unlikely to evaporate quickly, likely keeping crude in a $100-115/bbl range. For plastic resins, the cost-support thesis holds, but seasonal demand weakness should keep PP in the 8,200-8,600 yuan/tonne range and PE at 9,100-9,500 yuan/tonne. A breakout above these bands becomes probable if downstream operating rates recover seasonally from June onward while geopolitical tensions persist.
