(Monroe)---A man was seriously injured after an explosion and flash fire at a Monroe factory. The incident happened at 12:38pm Friday at Alfrebro Incorporated, 1055 Reed Road. Fire Chief John Centers says the worker was transferring a container of the chemical Acetal to another container when a chemical reaction occured, causing the explosion and fire. The victim was taken to Miami Valley Hospital by Care Flight for treatment of undisclosed injuries. The plant was evacuated while firefighters made sure the building was safe. Mutual Aid was provided by Liberty Township and Middletown Hazmat.