Idemitsu Cuts Ethylene Production Amid Strait of Hormuz Closure, Raising Supply Chain Concerns

Bearish (-0.6)Impact: High

Published on March 16, 2026 (3 hours ago) · By Vibe Trader

Idemitsu Kosan has announced a reduction in ethylene production at two of its domestic plants, including the Chiba facility, due to a shortage of naphtha caused by the de facto closure of the Strait of Hormuz amid ongoing conflict in Iran [1]. The company cited disruptions in the Middle East supply chain as the primary reason for the naphtha shortage, which is now threatening the plastics supply chain in Japan [1]. An Idemitsu spokesperson stated, 'The closure of the Strait of Hormuz has severely limited our ability to secure naphtha, and we are adjusting ethylene output accordingly to minimize disruption' [1].

While exact volumes of the production cuts were not disclosed, industry sources warn that if the closure persists, more facilities may be forced to reduce output, potentially causing ripple effects across global markets [1]. The shortage is expected to impact manufacturers and could lead to higher prices for plastics and related products [1].

Market sentiment in the petrochemical sector is described as highly uncertain, with energy and feedstock supply chains disrupted by geopolitical tensions in the Middle East [1]. Analysts note that Idemitsu's production cuts may signal broader industry challenges if the Strait of Hormuz remains closed [1].

No forward-looking statements regarding recovery timelines or technical trading advice were provided in the article [1].

CONCLUSION

Idemitsu's reduction in ethylene output highlights the immediate impact of the Strait of Hormuz closure on Japan's petrochemical industry. The ongoing naphtha shortage is raising concerns about supply chain disruptions and potential price increases for plastics. If the closure persists, broader industry and global market challenges are expected.

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