Silicone
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Silicones
are not very strong adhesives, but are
known for their flexibility and high temperature
resistance. They are available in single
or two part forms. The latter function
like the two part epoxies, the former
like the single part polyurethanes. When
the single part adhesives cure they liberate
either alcohol or acetic acid (the familiar
smell of vinegar). They are often used
as bath and shower sealants. Their adhesion
to surfaces is only fair but like their
flexibility, their durability is excellent.
The two part versions need a hardening
agent to be mixed into the resin. Two
forms are available, those which liberate
acid on curing and those that do not.
As might be anticipated the two part adhesive
systems give a better cure in thick sections
than do the single part types.
