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The Silicon-Oxygen Bond
The hallmark durability of polysiloxane coatings
comes from chemical bonding. Silicon-oxygen
bonds repeat, giving the coatings a strong polymeric
backbone. Because the silicon-oxygen bonds
present in these hybrid coatings are stronger
than the carbon-carbon bonds found in organic
epoxy/urethane and epoxy/silicone-alkyd coatings,
they are able to resist degradation from continuous
exposure to sunlight, high temperatures, chemicals,
abrasion and other environmental hazards.
The chemical structure of polysiloxane coatings
also makes them less susceptible to degradation
by oxidation. Each silicon atom in the binder
matrix of the polysiloxane polymer is bonded to
two or three oxygen atoms. As a consequence,
the silicon is already 50 to 75 percent oxidized
and, therefore, nearly impervious to the oxidation
that weakens the carbon-carbon bonds in epoxy/
urethane and epoxy/silicone-alkyd coatings.
Many polysiloxane coatings also have low volatile
organic compound (VOC) content. That is because
the siloxane binders that are the building blocks
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