The Siam Cement Public Company LimitedROC olefins plant restart restores production and offsets MOC maintenance-driven capacity decline, preserving Q4 profitability.

Siam Cement Public Company Limited, or SCC, announced that Rayong Olefins Company Limited, or ROC, has completed the restart of its olefins plant on 17 September 2026, after a temporary shutdown caused by the situation in the Middle East region. Thammasak Sethaudom, President and CEO of SCC, said ROC had successfully begun the plant restart process after assessing operational readiness and safety standards. An analysis by Bualuang Securities views the news as positive, because ROC's restart will help offset the reduced olefins production capacity of the Map Ta Phut Olefins plant, or MOC, which will decline due to planned maintenance shutdown in the fourth quarter of 2026, keeping olefins output in the fourth quarter of 2026 roughly flat compared with the third quarter of 2026 and helping preserve the company's profitability during that period. The broker maintained its Buy recommendation with a target price of 332 baht.
The Siam Cement Public Company LimitedROC olefins plant restart restores production and offsets MOC maintenance-driven capacity decline, preserving Q4 profitability.
ROC completed restart of its olefins plant on 17 September 2026 after a temporary Middle East-related shutdown.
MOC's olefins production capacity will decline due to a planned maintenance shutdown in Q4 2026.