FK-5-1-12 is a fluorinated ketone (Dodecafluoro-2-methylpen- tan-3-one) compound of carbon, fluorine and oxygen (CF3CF2C(O)CF(CF3)2). It is colourless, electrically non-conductive and has a low odor. It suppresses fire primarily by physical mechanisms due to its relatively high heat capacity with minimal effect on the available oxygen. This allows people to see and breathe, permitting them to leave the fire area safely.

FK-5-1-12 fluid is acceptable for use in occupied spaces when used in accordance with the United States Environmental Protection Agency (EPA) Significant New Alternatives Policy (SNAP) program rules. 

Kidde Fire Systems ECS 500 psi Fire Suppression Systems designed for use with FK-5-1-12 Fire Protection Fluid are designed to extinguish fires in specific hazards or equipment located where an electrically non-conductive agent is required, where agent cleanup creates a problem, where extinguishing capability with low weight is a factor and where the hazard is normally occupied by personnel. FK-5-1-12 fluid is an acceptable alternative to Halon and is approved by the EPA and NFPA for use in fire suppression systems. 

FK-5-1-12 fluid complies with the NFPA Standard 2001, Standard for Clean Agent Fire Extinguishing Systems, EPA SNAP Program, (Significant New Alternate Policy), Underwriters Laboratories, Inc. (UL) FM Approvals (FM).

The Kidde Fire Systems ECS 500 psi Fire Suppression System is environmentally friendly with zero ozone depletion potential (ODP) and negligible global warming potential (GWP). The atmospheric lifetime is between three and five days making it an ideal solution without compromising the environment.