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Fire protection
products
Conductive
coatings
Absestos
remediation
Industrial floorings
Acryl-silicone
paints
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Though based on the
results of long term tests
and experience the present
information is given as a
guide only as utilization and
operating conditions are
extremely variable.
We cannot accept any
liability for use of the product
that must be verified by the
user.
Accurate preliminary testing
is highly advisable to obtain
the full advantage of this
product. Call in our technical
department for any further
information you may need.
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IRIDAL SILOX
IRIDAL SILOX QUARZO
IRIDAL SILOX is a hybrid acryl-silicone paint with excellent wheathering
characteristics, that offers simultaneously water vapour permeability and
waterproofing.
Moreover it has a high resistance outdoors, to rain, abrasion and wet scrub.
Due to these characteristics it gives a durable protection of mansonry from the
action of rain and weather, soluble salts, acid rain and aggressive chemicals,
which are carried by water inside the wall structure to perform their destructive
action.
Therefore formation of efflorescence, mildew growth and damage from freeze-
thaw cycles are dramatically reduced. Also the loss of thermal insulation,
usually due to a high moisture content in the wall, is reduced and formation of
thermal bridges is avoided.
IRIDAL SILOX belongs to the new generation of acryl-silicon facade paints
that, due to the sinergystic effect of the binders used, shows two apparently
opposite physical characteristics. Besides the very low permeability to liquid
water contributed by the silicon compounds (hydrorepellency) IRIDAL SILOX
has a very high permeability to water vapour. This allows transfer to the
outside of water that may have entered through different paths (from
basament via capillary absorption, from inside the building by condensation,
from other parts of the mansonry that are unprotected.
This concept, that comes from the theory initially developed by Künzel and
adopted first in DIN standards, is the most advanced technique of façade
protection from weathering.
KÜNZEL PLOT
The Künzel plot, reported above, shows the water transport characteristics of
paints by plotting resistance to water vapour diffusion (Sd) versus liquid water
permeability (w). The first parameter, expressed in meters, represents the
equivalent air layer thickness which gives the same water vapour transfer
resistance as the layer of paint. In practice it should be the lowest possible
value to ensure a proper water vapour outlet. The parameter w represents the
permeability to water and must be the lowest possible to adequately protect
the coated surface.
These characteristics are difficult to match simultaneously. An emulsion paint
generally gives good waterproofing but a low release of water vapour. A
mineral paint (silicate or lime) has a very good vapour permeability but a very
bad protection from penetration of water from rain.
The acryl-silicon paints, due to their hybrid nature, to the hydrorepellency of
the silicon resin and to their typical microporous structure, offer an optimal
balance of vapour permeability and water repellency. Therefore they are found
in the Künzel plot in the best position.
The following picture (SEM electron microscope) shows the microporous
structure of an acryl-silicon paint film compared to a standard latex paint film.
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ACRYL-SILICON PAINT
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STANDARD PAINT
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Through microporosity the water vapour transfer is allowed, while a difficult
penetration of liquid water is obtained due to poor affinity to polar liquids of
the silicon polymer that is oriented on the substrate in a way to direct
hydrophobic methyl groups outbound.
In the following picture a comparison is reported showing a porous unprotected
substrate (sandstone) and the same coated with two coats of IRIDAL SILOX
and IRIDAL SILOX QUARZO (the quartz filled version), with a standard latex
paint (SL) and a standard quartz filled latex paint (SQ). It clearly shows how
water absorption is much lower in specimens coated with IRIDAL SILOX paints.
CHARACTERISTICS
IRIDAL SILOX can be applied on different substrates used in building
construction, including plaster, concrete, reinforced concrete. It is particularly
useful outdoor and in moist environment and has an excellent resistance to
sunlight (note: lightfastness or colour fading may depend on the choice of
pigment in coloured shades). Application is performed with conventional
techniques (brush, roller, airless spray) and dilution with tap water.
The product is waterborne, with low cosolvent content and low environmental
impact.
IRIDAL SILOX is complying with standards DIN 52615, DIN 52617 and DIN
18550. According to the latter, façade paints with excellent durability must
have a low vapour resistance coefficient (equivalent thickness S d < 2 m), a
low permeability coefficient ( w < 0.5 kg·m -2 h -0.5 ) and a low product of
both ( S d x w < 0.2 kg·m -1 h -0.5 ).
Values obtained for IRIDAL SILOX in various tests are reported in the table
below.
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IRIDAL SILOX
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IRIDAL SILOX QUARZO
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Sd coefficient
(m)
for 250 µm
(2 coats)
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0.03-0.06
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w coefficient
(kg·m -2 h -0.5 )
for 250 µm
(2 coats)
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0.10-0.12
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0.03-0.09
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Sd x w
( kg·m -1 h -0.5 )
for 250 µm
(2 coats)
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0.003-0.007
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0.0009-0.004
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Wet abrasion resistance (scrub test) is over 7000 cycles according 53778, i.e.
IRIDAL SILOX is perfectly washable and resistant to outdoor exposure.
| WET SCRUB TEST |
STANDARD |
| > 7000 cycles |
DIN 53778 |
The data reported were obtained from experimental tests by independent
laboratories (test report of the University of Venice issued 14.04.1998; test
report of Rhône-Poulenc research center in Aubervilliers issued 8.01.1998).
REFERENCES
J. M. Pouchol, Fatipec Congress proceedings 1986, Vol. 2 B, p. 555-587,
Venezia, Italy
J. M. Pouchol, EuroCoat 89 Conference, Nice, France, september 1989
F. Huguet, EuroCoat 96 Conference proceedings, Vol. I, pp. 173-178, Genova,
Italy
september 1996
C. De Backer, Double Liason -Chimie des Peintures, n. 255, 1976, p. 461-
470
Deutsche Norm DIN 52 615, Deutsches Institut fur Normung, Berlin
Deutsche Norm DIN 52 617, Deutsches Institut fur Normung, Berlin
Deutsche Norm DIN 18 550, Deutsches Institut fur Normung, Berlin
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