Mitsubishi Chemical's decision to cut ethylene production is a direct consequence of a sudden, severe disruption in its raw material supply chain.
The immediate trigger is the effective closure of the Strait of Hormuz, a critical chokepoint for global energy supplies. Due to escalating geopolitical tensions in the Middle East, major shipping lines like Maersk and Japan's own NYK have suspended transits. This has halted the flow of naphtha, the primary feedstock for Japan's petrochemical plants. The result is a dual shock: physical scarcity of raw materials and soaring costs, as crude oil prices surged to over $115 per barrel, their largest weekly jump in decades.
This logistical crisis hit an industry already struggling with weak economics. For months, the profit margin for producing ethylene from naphtha—known as the 'ethylene-naphtha spread'—has been below the typical breakeven points for producers. When the price of naphtha skyrockets but the price of ethylene doesn't keep pace, manufacturing becomes a loss-making activity. Therefore, the Hormuz closure provided a clear economic rationale to reduce operations rather than produce at a significant loss.
Furthermore, this tactical decision aligns with a broader strategic shift in Japan's chemical industry. For some time, Japanese producers have been facing intense competition from new, large-scale plants in China, leading to regional oversupply. In response, companies like Mitsubishi Chemical have been pursuing structural rationalization—consolidating operations and planning to shut down older, less efficient facilities. This pre-existing move towards a smaller, more efficient industrial base meant there was less resistance to cutting production when faced with a major supply shock.
In short, the production cut at the Kamisu plant was not caused by a single factor. It was the result of a perfect storm: a sudden geopolitical event layered on top of poor underlying market profitability and a long-term industry trend of consolidation.
- Naphtha: A flammable liquid hydrocarbon mixture distilled from petroleum, used as a primary raw material (feedstock) for producing plastics and other chemicals.
- Ethylene: A basic chemical building block, produced from naphtha, that is used to make many common products, including polyethylene plastic.
- Strait of Hormuz: A narrow, strategically important waterway between Iran and Oman, through which about 20% of the world's oil consumption passes.