SK Hynix fire and HF leak evacuates 3,600 at Cheongju chip plant
In brief
- Fire in sixth-floor gas room at SK Hynix Cheongju plant triggered hydrogen fluoride leak June 1
- 3,600 employees evacuated; six to seven workers hospitalized for eye irritation from toxic exposure
- Automated sprinkler systems extinguished fire but triggered chemical leak
- Manufacturing operations remained fully functional with zero downtime recorded
- Incident highlights AI chip supply-chain vulnerability to localized disruptions
The incident
Automated sprinkler systems extinguished the flames quickly, but the sprinkler activation apparently triggered the hydrogen fluoride leak. By roughly 1:38 p.m. local time, the residual gas had been cleared from the facility. Employees were allowed to re-enter only after thorough return inspection and safety checks were completed.
The fire's location—a gas room on the sixth floor—raises questions about facility design and chemical storage protocols. That a sprinkler system activation could trigger a hazardous-gas release suggests SK Hynix will need to review its containment and safety architecture at the Cheongju site.
Production and supply-chain impact
Production operations reportedly remained fully functional throughout the incident with no manufacturing downtime recorded. This rapid containment prevented disruption to the M15 facility, which produces NAND flash memory, and the M15X expansion, part of SK Hynix's broader push to increase capacity.
SK Hynix is one of the planet's largest memory chipmakers, producing the high-bandwidth memory (HBM) chips essential for the AI boom. SK Hynix's HBM chips are used in Nvidia's most advanced AI accelerators and other cutting-edge hardware. Market analysts have reported no significant connection between this event and potential disruptions to semiconductor supply or pricing.
Still, the incident underscores how localized disruptions at critical manufacturing nodes can ripple across global AI infrastructure. SK Hynix reported robust financial performance in Q1 2026, paralleling gains seen at competitors including Samsung and Micron, but production concentration at single facilities remains a structural vulnerability in chip supply chains.
