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HFC-23TM Extinguishing Agent for Total Flooding Applications
HFC-23TM is a gaseous extinguishing agent, which can be used as a replacement for Halon 1301 in total flooding systems to protect “normally occupied” areas.

HFC-23 is efficient on Class A, B and C fires, it is electrically no-conductive and leaves no residue after discharge.

Halogenated extinguishing agents, when in contact with fires or burning surfaces, generate dcomposition byproducts, which can be harmful to humans. In order to limit the creation of toxic byproducts, HFC-23 fire frotection systems are designed with a maximum discharge time of 10 seconds. The addition of isoprpenyl l-methyl cyclohexene further reduces the creation of toxic fumes.

Due to its extremely low toxicity level, HFC-23 is suitable for protection of “normally occupied” areas, allowing the designer to apply large safety factors, when the risk requires high system reliability. Even for the most critical applications, the design concentration will be far lower than that which would cause harmful effects to the personnel present in the protected area. The minimum extinguishing concentration for n-heptane, determined by the cup-burner test, is 12% by volume.

The physical properties of HFC-23 allow a fast and homogeneous distribution in the protected volume, ensuring a rapid and efficient extinguishment of the fire.
HFC-23 complies with the requirements of purity for HFC 23 as listed in international standards for gaseous extinguishing agents.
Although any potential fire risk presents its own particular complexities, the choice of HFC-23 in a fire protection system is suitable when:

· an electrial no-conductive gaseous extinguishing agent is required
· the clean-up of another media would represent a problem
· to guarantee a high system reliability and, at the same time, the safety of personnel is of essence
· sub-zero temperatures are encountrad in the protected volume. 

Typical examples of hazards where the use of HFC-23 is suitable are: computer rooms, control rooms, archives, flammable liquid stores, laboratories, military vehicles, telecommunications system.
Environmental impact 
The Montreal Protocol, which establishes the actions to control emissions of substances damaging the ozone layer, banned the manufacture of Halons due to their high Ozone Depletion Potential (ODP). HFC-23, unlike Halon 1301 (ODP = 12-16), does not contain Bromine nor Chlorine.
Consequently, it does not deplete the stratospheric ozone layer (ODP = 0).
Taking into consideration the reduced quantity of this product, which would be used for very specific applications, then the Global Warming Potential (GWP) and Atmospheric Lifetime (ALT) are also acceptable.
HFC-23 does not pose any risk to humans when used at its recommended desing concentration.
HFC-23 acute toxicity (LC50 for 4 hours = >65%) is far higher than the normal concentrations of use. Exposure at lower concentrations for a limited period of time does not represent a risk to personnel.
Nevertheless, like Halon 1301, exposure to the product at higher concentrations and for longer periods of time can cause indisposition, lack of coordination and heart arrhythmia.
The cardiac sensitization is the first evident symptom when exposed to halogenated extinguishing agents. The NOAEL (No Observable Adverse Effect Level) and LOAEL (Lowest Observed Adverse Effect Level) values for HFC-23 are respectively 50% and 50%. 
HFC-23 Physical Properties
1301     HFC-23 
Halon 1301


Molecular weight 70.01 148.93
Boiling point @ 1 atm (°C) - 82.2 - 57.8
Critical temperature (°C) 25.9 67
Critical Pressure (bar) 48.36 39.6
Critical density (Kg./m3) 525 745
Vapour pressure @ 25°C (bar) 47.29 16.20
Liquid density @ 25°C (g/ml) 0.67 1.57
Freezing point (°C) -155.2 -168
Specific heat of liquid @ 25°C (j/Kg °C) 1,549 910
Heat of vapourization at boiling point point (Kj/Kg) 329.5 120.9
Viscosity of liquid @ 25° C (cP) 0.083 0.059
Solubility in water @ 25° C (% weight) 0.1 0.03
Phisical state Liquid/vapour Liquid/vapour
1301       HFC-23 
Halon 1301


Ozone Depletion Potential

(CFC 11 = 1)


0 12 – 16
Global Warming Potential

(Kg. CO2  - 100 year horizon)


12,100  5,600

Atmospheric Lifetime



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