GL-125TM Extinguishing Agent for Total Flooding Applications
HIGHLIGHTS
GL-125TM is a gaseous
extinguishing agent, which can be used as a replacement for
carbon dioxide and Halon 1301 in total flooding systems to
protect “normally occupied” areas.
GL-125 is efficient on Class A, B and C fires, it is
electrically no-conductive and leaves no residue after
discharge.
GL-125 is a blend of 125 and 1-bromopropane. The latter
enhances the extinguishing performance of HFC 125.
The minimum extinguishing concentration for n-heptane,
determined by the cup-burner test, is 6.2% by volume. Full
technical specification has been submitted to NFPA for
inclusion in the NFPA 2001 Standard.
The physical properties of GL-125 allow a fast and homogeneous
distribution in the protected volume, ensuring a rapid and
efficient extinguishment of the fire.
Use
GL-125 is an economically
advantageous choice to replace Halon 1301. Furthermore, as
replacement for carbon dioxide in fixed system, it features
the following advantages:
· the cost of GL-125 system is lower than a CO2 system
· GL-125 can be discharged in 10 seconds, allowing faster
knockdown than CO2 and reducing the damage caused by the fire
· the relationship between space/weight and extinguishing
capability is of essence
· lower toxicity level
Although any potential fire risk present its own particular
complexities, the choice of GL-125 in a fire protection system
is suitable when:
· an inert and electrical noconductive extinguishing agent is
required
· the clean-up of another media would represent a problem
· a rapid extinguishment of the fire is desired
· the risks to life posed by CO2 are to be eliminated.
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-125, unlike
Halon 1301 (ODP = 12-16), 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.
Toxicity
GL-125 is an extinguishing
agent to be used in normally “non occupied” areas.
Its acute toxicity (LC50 for 15 minutes is 50%) is far lower
than the recommended concentrations of use.
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-125 are respectively 4%
and 6%.
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)
Gielle Srl -
Idari Ofis Via R. Ferri 32 Z.I. - 70022 Altamura (Ba) Italy
Tel +39 0803118998 - Fax + 39 0803101309
E-mail: info@gielle.it
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