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General Physical Properties
The construction sealant, reacting with the
moisture existing in the air, tends to harden
as a result of the hydrolysis effect between
the base polymer Si-OH and Si-X and the condensation
reaction. Water is essential in such a process
as well as is in need of the Sn titanic catalyst.
Thus, hardening process is affected by moisture
and the deep part remaining not in contact
with moisture tends to be retarded in hardening.
It remains stable while remaining not in contact
with moisture, but once it was exposed to
moisture, the part of Si-X is replaced with
Si-OH, resulting in condensation reaction.
In the wake of a gradual reaction, a crosslinking
occurs, which leads to transforming into the
elastic body.
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1.Easy
to handle
Use the product by simply squeezing
the cartridge container. No mixer or
equipment is needed. It hardens, reacting
with moisture, at the room temperature
without extra heating.
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2.High adhesion
As it has a high degree of adhesion,
it is highly adhesive to any material
without applying the primer, but it
may require cleaning or primer application,
depending on surface condition. |
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3.Excellent heat
and cold-resistance
Once completely hardened, it sustains
the certain adhesion and elasticity
within a temperature ranging from -30∑C
~ 200∑C even in case of being exposed
continuously. A specially-designed product
can be used for a certain short period
even at the temperature of 250∑C. |
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4.Chemically
stable
A silicon sealant is highly resistant
to the chemicals and oil, compared to
common organic rubber material. Even
in case it was exposed to engine oil,
it remains unresolved or dissolved,
but restores to the original state when
a catalyst is removed. |
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5.Excellent weather-resistance
Ultraviolet-resistant, ozone-resistant
and waterproof, which enables to sustain
its original properties even after the
outdoor application. |
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Cautions
As silicon sealant tends to become a
rubber elastic body as a result of reaction
with the moisturein the air, a hardening
condition shall be observed after application.
A standard conditions refers to, in
general, 25∑C with 65% humidity, which
serves the base to all data produced.
Keeping the product in cool and dry
place, in principle, is recommended.
A silicon sealant creates the by-product
(HX) in the process of hardening, which
requires a careful attention. For instance,
the products using acetoxysilan as a
cross-linker is called as acetic acid
sealant, which generates the acetic
acid that is corrosive, while generating
a stimulative odor. |
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