Beyond the barrel: Asia’s methanol and sulfur exposure in Hormuz

The Strait of Hormuz closure has so far been read as an oil and liquefied natural gas (LNG) story. The quieter disruption, tracked by the World Economic Forum and catalogued in the Atlantic Council's April dispatch this month, is to the non-energy commodities that feed Asia’s plastics, fertiliser and battery supply chains, and that sit without the strategic reserves or hedging machinery that cushion crude.The World Economic Forum in April identified nine commodities, beyond crude and LNG, that flow through Hormuz at volumes material to global manufacturing. Methanol, sulfur, aluminium, urea, ammonia, ethylene, polyethylene, propylene and graphite all have concentrated Gulf supply points and Asian demand points. PolitiFact and Renewable Matter reach a similar conclusion, noting that the closure drags in fertilisers, aluminium, helium and battery inputs alongside the headline oil numbers. UNCTAD's April position paper describes the downstream effect as a compound shock moving from Gulf terminals to Asian factory gates within weeks rather than months.

Methanol is a clear liquid chemical used to produce formaldehyde, acetic acid and, increasingly in Asia, olefins through the methanol-to-olefins process. Those olefins feed polyethylene and polypropylene plants that supply packaging, automotive components and consumer goods across the region. The WEF notes that around a third of global seaborne methanol trade passes through Hormuz, tightening the supply of a feedstock for resins, coatings and plastics. China is the dominant buyer. In recent years a large share of China's imported methanol has originated in Iran, with the balance from other Gulf producers including Oman, Saudi Arabia and Qatar. When vessels stop leaving Bandar Imam or Assaluyeh, the operating rate of China's coastal methanol-to-olefins plants falls within the storage cycle of those plants, typically measured in weeks.

Sulfur is the less visible exposure, and the more structurally awkward one. It is a by-product of refining sour crude and processing sour gas, which makes Saudi Arabia, the United Arab Emirates, Qatar and Kuwait four of the world's largest producers. Gulf sulfur is shipped primarily to phosphate fertiliser manufacturers in Morocco, India, Indonesia and China, where it is converted into sulfuric acid and then reacted with phosphate rock to produce the diammonium phosphate and monoammonium phosphate fertilisers that underpin Asian rice and wheat yields. The WEF highlights a second role: sulfuric acid is the reagent in the high-pressure acid leaching process that refines nickel, cobalt and copper for electric-vehicle batteries. A sustained Hormuz disruption during the pre-monsoon fertiliser application window, which runs April through June, pushes cost directly into the food system.

Aluminium is the exposure most likely to register on financial screens before it registers on factory floors. The WEF reports that Gulf Cooperation Council countries collectively produce around 6.16 million tonnes of primary aluminium, or about 8.35 per cent of global output, and that Europe imports around 20 per cent of its primary aluminium from the Middle East. Emirates Global Aluminium, operating smelters at Jebel Ali and Al Taweelah in the United Arab Emirates, and Aluminium Bahrain (Alba) in Bahrain, together sit among the world’s ten largest smelters. A significant share of their output ships to Asian customers, including Japanese automakers, Korean electronics producers and Southeast Asian construction fabricators. Smelter output itself is not directly interrupted by a shipping chokepoint, but the outbound metal is, and inventories at Asian ports draw down quickly when arrivals pause. The London Metal Exchange cash price has begun to reflect expectations of Gulf logistics delay.

Graphite, used as anode material in lithium-ion batteries, is a smaller but strategically concentrated flow. Iran and several Central Asian producers route natural graphite and some petroleum-coke feedstock for synthetic graphite through Gulf ports. Chinese, Japanese and Korean battery cell makers have been diversifying graphite sources since 2023, but Gulf-routed volumes remain a working part of the supply mix.

The test is how quickly commercial inventories can be reweighted. For methanol, Chinese buyers are reported to be turning to Trinidad, Venezuela and United States Gulf Coast cargoes to fill the gap. Freight from those origins runs 30 to 45 days against roughly 20 days from the Persian Gulf. For sulfur, Canadian and Kazakh export volumes can substitute in principle, but the logistics for Indian and Indonesian receivers are poor, and rail-to-port capacity is the binding constraint. For aluminium, Asian fabricators have the option to draw on Chinese, Indian and Malaysian smelters, but that shifts demand onto producers that are themselves under energy stress from elevated LNG prices. Substitution exists in every case. It is not fast, and it is not cheap.

Procurement teams across Asia are now learning, in real time, which of their inputs were quietly single-sourced through a 33-kilometre waterway. The test for the next quarter is not whether the strait reopens. It is whether the contracts, inventory buffers and alternative supplier qualifications behind these less-visible materials can be rebuilt before the price pass-through reaches the shelf.