In order to cope with the problem that no gas fire suppressant can be used in the future, perfluoro-2-methyl-3-pentanone (C6F12O), also known as FK-5112, Novec 1230 or Novec 649, with its environmentally friendly performance, zero ODP, GWP of approximately one and atmospheric lifetime of up to two weeks (as shown in Table 1), has been considered as the next generation of halon alternatives. C6F12O belongs to fluorinated ketones which is different to HFCs. Its nontoxicity, noncombustibility, excellent insulation properties and fire suppression efficiency have attracted worldwide attention. The thermophysical parameters, safety and environmental issues and other properties such as the dispersion characteristics of C6F12O are important indexes to evaluate whether it is appropriate to replace the halon. Meanwhile, these properties and parameters are critical to determine the application scenes of fire suppressant, the selection of fire extinguishment facilities and the engineering calculation of the fire extinguishment system.
properties of C6F12O (almost in liquid phase) and obtained more accurate calculation equations according to the experimental results. Then, Tanaka [9] measured the pρT
Properties | Data |
---|---|
Boiling point (1 atm) | 49.2 °C |
Freezing point | −108.0 °C |
Critical temperature | 168.7 °C |
Critical pressure | 18.65 bar |
Critical density | 639.1 kg/m3 |
Density, sat. Liquid | 1.6 g/ml |
Density, gas (1 atm) | 0.0136 g/mL |
Specific volume, gas (1 atm) | 0.0733 m3/kg |
Specific heat, liquid | 1.103 kJ/(kg °C) |
Specific heat, vapor (1atm) | 0.891 kJ/(kg °C) |
Heat of vaporization (boiling point) | 88 kJ/kg |
Liquid viscosity (0 °C/25 °C) | 0.56/0.39 centistokes |
Relative dielectric strength, (1atm, n2 = 1.0) | 2.3 |
Fire Suppressant |
LC50/ALC (%) | NOAEL (%) | LOAEL (%) | MEC (%) |
---|---|---|---|---|
C6F12O | >10 | 10 | >10 | 3.5–6.4 |
HFC 227ea | >80 | 9 | 10.5 | 5.8–6.6 |
HFC 125 | >70 | 7.5 | 10 | 8.1–9.4 |
Halon1301 | >80 | 5 | 7.5 | 2.9–4.0 |
Fire Suppressants | Molecular Weight | Boiling Point (°C, 1 atm) | Vapor Pressure (MPa, 25 °C) | Diffusion Coefficient (10−6 m2/s, 1 atm, 0 °C) |
---|---|---|---|---|
Halon 1301 | 149 | −57.9 | 1.62 | 7.49 |
HFC 125 | 120 | −48.5 | 1.37 | 6.81 |
HFC 227ea | 170 | −16.4 | 0.458 | 5.68 |
C6F12O | 316 | 49.2 | 0.04 | 4.17 |
This entry is adapted from the peer-reviewed paper 10.3390/fire5020050