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- What’s the Difference? |
In order to understand the advantages of the ImmerSeal® system over wet
applied sealants we should explore how the two systems perform.
ImmerSeal® is an ultra low modulus silicone extrusion
designed for extremely high extension and compression capabilities
while exerting very low tensile or compressive forces. Unlike other
elastomers which function generally as compression seals, ImmerSeal®
is bonded to the substrate using an adhesive sealant. Due to the
unique physical properties and relatively thin cross-section (~
2 mm) of ImmerSeal®, only minimal bond-forces are
generated during compression and extension movement of the substrates.
This crucial feature is new to the sealing industry and provides
consultants, engineers and designers with new ways to create high
performance seals, expansion joints and waterproofing systems.
It is critical not to confuse ImmerSeal® extruded
silicone profiles with compression seals. It can be described as
a passive seal, a seal that is being moved instead of withstanding
movement. Furthermore, since ImmerSeal® is manufactured
using 100% Silicone, a long service life is certain. Similar products
made of organic materials can not be manufactured at such a small
thickness while achieving such exceptional aging characteristics.
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- Joint Movement Performance Comparison |
Preformed Silicone Joint Sealants
ImmerSeal® deforms during joint movement, but
the deformation during compression is in the form of a bend,
which generates very little stress within the material and on
the substrates. |
Wet Applied Sealants
The volume of a wet applied sealant does not change during movement
of a joint, but the sealant cross-sectional shape is deformed
during extension or compression. During this deformation, stress
and or high pressure related forces strain the bond area. |
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- Performance Analysis |
Unlike Preformed Silicone Joint Sealants, wet applied sealants
experience much higher compressive forces than tensile forces at
the same amount of movement. High compressive forces can be detrimental
to the sealant adhesion and may damage fragile or sensitive substrates.
Lab results have shown that sealants fail during elongation after
compression cycles.
When comparing the forces generated by preformed silicone joint
seals to wet applied sealants experiencing equal movement, the results
might be surprising. Compressive and tensile forces generated during
movement are much lower for Preformed Silicone Joint Seals than
those generated when using conventional wet applied sealants. Since
the forces on the adhesive bonds of preformed joint seals are so
low, the adhesion should last a long time, even on difficult to
adhere to surfaces. Therefore, ImmerSeal® systems
are the best choice to use on sensitive substrates such as EIFS,
sandstone or grout, where most normal wet applied sealant systems
will pull the substrate apart at the surface.
Technical data obtained from ASTM "Science and Technology of Building Seals, Sealants, Glazing, and Waterproofing" vol. 7, Jerome Klosowski, Editor. Authors: Peter R. Hagen, Gregory E. Mayville and Jerome M. Klosowski. Reprinted with permission, from STP 1334-Science and Technology of Building Seals, Sealants, Glazing, and Waterproofing: Seventh Volume, copyright American Society for Testing and Materials, 100 Barr Harbor Drive, West Conshohocken, PA 19428
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