A clean agent fire extinguishant which was developed as a halon replacement and hydrofluorocarbon (HFC) alternative. It belongs to a family of chemicals called halocarbons, a group which includes HFCs and fluoroketones. Haylo fluid is a fluoroketone, while chemical clean agents like FM-200™ are HFCs (HFC-227ea). Haylo fluid has a global warming potential (GWP) of less than one while HFCs typically have a GWP of more than 3000. Haylo fluid has the highest margin of safety for human occupancy among clean agents, including inert gas.
FK-5-1-12, C₆F₁₂O, is a fluorinated ketone with the systematic name 1,1,1,2,2,4,5,5,5-nonafluoro-4–3-pentanone and the structural formula CF₃CF₂CCF(CF₃)₂, a fully fluorinated analog of ethyl isopropyl ketone.