GL-227TM Extinguishing Agent for Total Flooding Applications
HIGHLIGHTS
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.
Use
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.
Toxicity
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)
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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