Fire and Toxic Gas Leak at SK Hynix Cheongju Plant Injures Workers, Evacuates Thousands

Fire and Toxic Gas Leak at SK Hynix's Cheongju Plant Injures Workers, Evacuates Thousands

A fire broke out today at SK Hynix's semiconductor manufacturing complex in Cheongju, South Korea, triggering a hydrogen fluoride gas leak that left multiple workers injured and forced the evacuation of thousands, according to multiple local and international news reports.

The blaze, which ignited at one of the world's largest memory chip production facilities, sent at least seven workers to local hospitals for medical checks, the Korea JoongAng Daily reported. The Chosun Ilbo placed the injury count at 11, while emergency responders confirmed a toxic gas release that complicated the initial firefighting response.

Mass Evacuation Ordered

Authorities ordered the evacuation of approximately 3,600 employees from the Cheongju complex as the fire spread and the hydrogen fluoride leak was detected, according to reports from Yonhap News Agency and confirmed by the Economic Times. Hydrogen fluoride is a highly corrosive chemical widely used in semiconductor etching processes, and exposure can cause severe respiratory damage.

Fire crews worked to contain the blaze and stop the gas leak simultaneously. Local emergency services set up a perimeter around the facility as a precaution, diverting traffic and advising nearby residents to stay indoors with windows closed.

Production Impact Assessment

Despite the severity of the incident, the Seoul Economic Daily reported that the fire was "quickly extinguished" and initial assessments suggest no major disruption to semiconductor production. SK Hynix officials are conducting a full safety audit before the affected sections of the plant resume operations.

This is a critical reassurance for global technology markets. SK Hynix is the world's second-largest memory chipmaker and a key supplier of High Bandwidth Memory (HBM) chips used in Nvidia's AI accelerators. Any prolonged production halt at Cheongju could ripple through the already tight AI chip supply chain.

Hanwha Connection: Separate But Related Incident

The SK Hynix incident occurred on the same day as a separate, deadlier fire at a nearby Hanwha Aerospace factory in the same industrial corridor. The Korea JoongAng Daily reported that five workers died in that blaze, and the proximity of the two fires raised concerns about industrial safety standards in South Korea's high-tech manufacturing zone.

It remains unclear whether the two fires share a common cause, though investigators are looking at electrical and chemical storage infrastructure as contributing factors. South Korea's Ministry of Employment and Labor has dispatched a joint inspection team to both sites.

Market and Supply Chain Implications

SK Hynix shares have been on a tear in recent months, fueled by skyrocketing demand for AI memory chips. The company recently reported record margins and locked in HBM4 supply deals with major US tech firms. Industry analysts are closely watching whether today's fire and gas leak will affect HBM production timelines.

Digitimes reported that the HF leak raises particular concern because hydrogen fluoride gas can damage sensitive semiconductor equipment even at low concentrations. If cleanroom environments were compromised, recalibration and requalification cycles could take weeks.

Safety Record Under Scrutiny

Today's incident is not the first at a SK Hynix facility. The company has faced previous safety incidents, including a major fire at its Wuxi, China plant in 2013, and a separate gas leak incident in earlier years. Labor advocacy groups in South Korea have long called for stricter enforcement of industrial safety laws at semiconductor factories, citing the use of hazardous chemicals in confined cleanroom environments.

The Ministry of Employment and Labor has opened a formal investigation into both today's fire and the HF gas leak. Company officials said they are cooperating fully with investigators.

Reporting for Global1.news — Prof. David Park in Seoul.