CSB Releases Update on Investigation into Fatal Explosion and Fire at Resin Plant in Columbus, OH

U.S. Chemical Safety and Hazard Investigation Board (CSB), December 15, 2022

The U.S. Chemical Safety and Hazard Investigation Board (CSB) has released information related to its ongoing investigation of the April 8, 2021 explosion and fire at the Yenkin-Majestic OPC Polymers resin plant in Columbus, OH. The incident led to one fatality and injured eight additional employees. The CSB's investigation update provides a detailed incident description, background information on the facility and production as well as a history of the equipment. 

Resin plant the day after the incident. (Credit: CSB)

CSB Interim Executive Steve Owens said, “this was a very serious incident which led to a fatality, several injuries and serious damage to the facility and the surrounding community. This update provides important information about the events leading up to this incident while our investigation is ongoing.

The update details events on the night of the incident. Chemical reactions occurred when a process in a unit referred to as Kettle 3 was nearly complete. The CSB determined that during the addition of a solvent to Kettle 3 an agitator (stirring mechanism) had not been running for over an hour. When a worker realized that the agitator had shut down, he turned it on and the product inside the kettle began to quickly vaporize. This increased pressure inside the kettle, which continued to rise until a mixture of resin liquid and flammable solvent vapor released from Kettle 3’s manway into the enclosed room where the kettle was located.

As the pressure in Kettle 3 continued to build, flammable vapor spread throughout different areas of the building, including the furnace room, and ignited. The explosion also ignited flammable material present at the plant which resulted in a large fire. Two employees were rescued from collapsed parts of the plant, one employee was fatally injured, and eight others were transported to area hospitals for injuries.  

Moving forward the CSB’s investigation will continue to analyze several key areas, including:

  • Equipment design,
  • Process safety management systems,
  • Regulations, industry standards and guidance, and
  • Emergency response to a flammable vapor release.

Board Member Sylvia Johnson said, “Our investigation is still ongoing. Complete findings, analyses and recommendations will be available in the agency’s final report. In the interim, the CSB’s goal is to distribute information on our ongoing work as it becomes available.” 


About the CSB

The CSB is an independent, non-regulatory federal agency whose mission is to drive chemical safety change through independent investigations to protect people and the environment. The agency’s board members are appointed by the President and confirmed by the Senate. CSB investigations look into all aspects of chemical incidents, including physical causes such as equipment failure as well as inadequacies in regulations, industry standards, and safety management systems. The CSB does not issue citations or fines but makes safety recommendations to companies, industry organizations, labor groups, and regulatory agencies such as OSHA and EPA. For more information, please visit


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