The February freeze that triggered mass blackouts in Texas led to chemical plant shutdowns that are disrupting global supply chains, causing a shortage of the raw materials needed for everything from medical face shields to smartphones.

The power outages brought the world’s largest petrochemical complex to a standstill, forcing more plants in the Gulf of Mexico region to shut down than during Hurricane Harvey in 2017. A month later, many remain offline, and analysts said it could be months more before all are fully back.

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