This article first appeared on GuruFocus .
Supply stress is no longer just an upstream storyit is starting to move through the system. Deepening disruptions tied to Middle Eastern crude flows are tightening naphtha availability in South Korea, a key feedstock for plastics that sits at the center of the country's industrial chain. LG Chem ( LGCEY ) has already taken action, temporarily shutting one of its three naphtha cracking facilities, a signal that constraints are beginning to translate into operational decisions. With roughly half of supply sourced from the Middle East, any prolonged instability could continue to ripple across Asia's fourth-largest economy.
The pressure is now surfacing at the consumer level. Early signs of stockpiling have emerged, with demand for government-designated garbage bags climbing sharply in parts of Seoul, forcing some retailers to impose purchase limits as shelves empty. At the same time, pricing dynamics are shifting quickly. Ethylene, a key derivative used in food-grade plastics, has nearly doubled to above $1,400 per ton since January, while naphtha prices have risen more than 60% amid shipping disruptions through the Strait of Hormuz. Industry data suggests inventories are running thin, in some cases covering only around two weeks, leaving producers increasingly exposed to further supply shocks.
That strain could extend into the food supply chain. NongShim Co. and Samyang Foods Co. indicate they may have only a limited window of plastic film supply remaining, potentially just a few months, which could begin to pressure production or pricing if shortages persist. Chemical producers are now racing to secure alternative feedstock from regions such as the US and Africa, with late March to early April seen as a critical period for supply conditions. While authorities suggest a full breakdown in supply remains unlikely, the current trajectory could still weigh on industrial output, consumer pricing, and broader economic activity if disruptions continue.
