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GL-227TM Extinguishing Agent for Total Flooding Applications
GL-227TM is a gaseous extinguishing agent, which can be used as a replacement for Halon 1301 in total flooding systems to protect “normally occupied” areas.

GL-227 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, GL-227 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 low toxicity level, GL-227 is suitable for protection of “normally occupied” areas. For most common applications, the recommended design concentration is lower than that which would cause harmful effects to the personel present in the protected area.

The minimum extinguishing concentration for n-heptane, determined by the cup-burner test, is 6.6% by weight.

The physical properties of GL-227 allow a fast and homogeneous distribution in the protected volume, ensuring a rapid and efficient extinguishment of the fire at normal ambient temperatures.
GL-227 complies with the requirements of purity for HFC 227 ea as listed in international standards for gaseous extinguishing agents.

Although any potential fire risk presents its own particular complexities, the choice of GL-227 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

· the relationship between space/weight and extinguishing capability is of essence 

· the safety of personnel within the protected area must be guanteed. 

Typical examples of hazards where the use of GL-227 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). GL-227, unlike Halon 1301 (ODP = 12-16), does not contain Bromine nor Chlorine.

Consequently, it does not deplete the stratospheric ozone layer (ODP = 0). Also the low Global Warming Potential (GWP) and low Atmospheric Lifetime (ALT) make it an acceptable replacement.
GL-227 does not pose any risk to humans when used at its recommended desing concentration.

GL-227 acute toxicity (LC50 for 15 minutes = >80%) 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 GL-227TM are respectively 9.5% and 10.5%.
GL-125 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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