Editing Butanone (section)

===Flammability===
Butanone can react with most oxidizing materials and can produce fires.<ref name="TurnerMcCreery"/> It is moderately explosive, requiring only a small flame or spark to cause a vigorous reaction.<ref name="TurnerMcCreery"/> The vapor is heavier than air, so it can accumulate at low points. It is explosive at concentrations between 1.4 and 11.4%.<ref name=medrev/> Concentrations in the air high enough to be flammable are intolerable to humans due to the irritating nature of the vapor.<ref name="Fairhall"/> Butanone fires should be extinguished with [[carbon dioxide]], dry agents, or [[Firefighting foam|alcohol-resistant foam]].<ref name="TurnerMcCreery"/>

The ignition of butanone vapor was the [[proximate cause]] of the 2007 [[Xcel Energy Cabin Creek fire]], resulting in the deaths of five workers in a hydroelectric [[penstock]]. After the incident, the [[U.S. Chemical Safety and Hazard Investigation Board]] specifically noted the danger posed by butanone in confined spaces, and suggested [[1,1,1-trichloroethane]] or [[limonene]] as safer alternatives.<ref>{{cite web |url=https://www.csb.gov/file.aspx?DocumentId=5703 |title=Investigation Report: Xcel Energy Hydroelectric Plant Penstock Fire |author=U.S. Chemical Safety and Hazard Investigation Board |author-link=U.S. Chemical Safety and Hazard Investigation Board |date=August 2010 |publisher=U.S. Chemical Safety and Hazard Investigation Board}}</ref>