On Tue, 12 Oct 2004 10:54:43 -0500, "Don Parker"
Tiny little glass beads that can be mixed with glue (or dope)
to make a filler:
Microballoons are a lightweight free-flowing white powder consisting
of microscopic, hollow, glass ball clusters. Microballoons are a
specially processed silica glass, classified to insure uniform
particle size and product performance and is hydrophopic (does not
readily adsorb moisture). It disperses extremely well when mixed with
various resins or plaster. Microballoons do not absorb resin and
therefore provide maximum filler function. Cured systems are more
water resistant and have a higher temperature resistance in addition
to being more thermal and electrical resistive.
In addition, microballoons reduce the weight of the finished the
product and offers improved workability (nailing, sawing, drilling,
etc.) further reducing costs. It has been used extensively in molded
vanities, doors, columns, lighting fixtures, picture frames, etc. It
is more more easily sanded than fiberglass flock, so it can be used in
polyester systems where extremely high-strength is not required. It
can be used in sandable pastes to repair imperfections in wood and
fiberglass boats, cars or other parts. Many engineering students at
the university level have used microballoons to increase buoyancy and
as a lightweight and inexpensive filler in cement canoe projects.