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Formosa Plastics Vinyl Chloride Explosion
Illiopolis, IL, April 23, 2004
Formosa Plastics Vinyl Chloride Explosion
Smoke billows from heavily damaged Formosa Plastics plant following April 23 explosion. Photo: Kevin German/The State Journal-Register.

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Incident Description
On April 23, 2004, five workers were fatally injured and two others were seriously injured when an explosion occurred in a polyvinyl chloride (PVC) production unit at Formosa Plastics in Illiopolis, Illinois, east of Springfield. The explosion followed a release of highly flammable vinyl chloride, which ignited. The explosion forced a community evacuation and lighted fires that burned for several days at the plant.

Investigation Status
The CSB's final report on this investigation was issued at a news conference in Springfield, Illinois, on March 6, 2007.

Reports Final Investigation Report
Webcast
News Releases News Release March 6, 2007 - CSB Issues Final Report and Safety Video on Formosa Plastics Explosion in Illinois, Concludes That Company and Previous Owner Did Not Adequately Plan for Consequences of Human Error
News Releases News Release April 22, 2005 - CSB Investigation of Formosa Accident Continues; Agency Analyzing Evidence, Determining Root Causes
News Releases News Release April 30, 2004 - CSB Continues Investigation of Formosa Plastics Explosion, Examines Functioning of Plant Fire Safety System for Vinyl Chloride
News Releases News Release April 25, 2004 - CSB Chairman Merritt Declares Full Root-Cause Investigation of Fatal Accident at Formosa Plastics PVC Plant in Illinois
News Releases News Release April 24, 2004 - CSB Investigation Team En Route to Site of Serious Explosions at Formosa Plastics PVC Plant in Illinois