On August 30, 2026, U.S. forces struck Iranian launchers on Larak Island near the Strait of Hormuz and Iran retaliated against U.S. positions in Jordan, sending Brent crude more than 2% higher above $90 a barrel and putting energy and petrochemical supply risks back at the center of global markets.
A U.S. official said two Iranian launchers on Larak Island were targeted. The strikes marked the first known direct U.S. attacks on Iran since late July.
Iran subsequently retaliated, including strikes against U.S. military positions in Jordan, ending a period in which the conflict had appeared to be moving toward a more contained phase.
Oil markets reacted immediately.
Brent crude rose $2.21 to $90.31 per barrel, while West Texas Intermediate gained $1.83 to $85.23. Brent moved still higher in Asian trading on August 31, reaching around $90.60 a barrel.
The central concern remains the Strait of Hormuz.
Roughly one-fifth of global oil supply normally moves through the narrow waterway, making it one of the most important energy shipping corridors in the world.
For the chemical industry, however, the exposure extends well beyond crude.
The Gulf is a major source of LPG, petrochemical feedstocks, polyethylene, polypropylene and fertilizer-related products. Any deterioration in shipping conditions can raise freight and insurance costs before it begins to affect physical availability.
That matters particularly for Asian petrochemical producers.
Many crackers across Northeast and South Asia rely heavily on imported naphtha and LPG. Higher crude prices feed directly into naphtha economics, while disruption to Gulf LPG cargoes can tighten propane and butane availability.
If crude remains around $90 or moves higher, naphtha-based ethylene and aromatics producers would again face stronger feedstock pressure after months of difficult margins.
The effect on polymers is less straightforward.
Middle Eastern producers are among the world's lowest-cost exporters of polyethylene and polypropylene, and prolonged shipping disruption could lengthen delivery times into Asia.
But regional polymer inventories and substantial Chinese production mean higher freight costs do not automatically translate into immediate shortages.
Physical vessel movements will matter more than headline oil prices.
Shipping through Hormuz has remained below normal levels during much of the conflict. U.S. naval escorts have helped some Gulf exports recover, with recent oil flows estimated at around 15 million to 16 million barrels per day, but renewed military activity is forcing tanker operators, insurers and traders to reassess conditions again.
Washington is also looking for additional supply options.
The U.S. government has said Venezuelan crude from a new arrangement will be used to replenish the Strategic Petroleum Reserve, which currently holds roughly 290 million barrels, its lowest level in 44 years.
That will not provide an immediate solution. Venezuela would need significant investment and infrastructure work before production could rise sharply.
For chemical markets, the next few days will therefore depend less on a single oil-price move and more on what happens physically in and around Hormuz.
If fighting remains contained, much of the impact could stay in the form of higher risk premiums, freight costs and feedstock prices.
If shipping volumes fall sharply again or energy infrastructure becomes a direct target, the consequences would extend further into LPG, naphtha, olefins and downstream polymer supply chains.
