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Microballoons: Yay or Nay by CarverToo
Started on: 05-01-2014 03:14 PM
Replies: 4 (488 views)
Last post by: Raydar on 05-01-2014 11:19 PM
CarverToo
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Report this Post05-01-2014 03:14 PM Click Here to See the Profile for CarverTooClick Here to Email CarverTooSend a Private Message to CarverTooEdit/Delete MessageReply w/QuoteDirect Link to This Post
What is your experience with this product and what are its likely applications?
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TriumphFetish
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Report this Post05-01-2014 04:34 PM Click Here to See the Profile for TriumphFetishClick Here to Email TriumphFetishSend a Private Message to TriumphFetishEdit/Delete MessageReply w/QuoteDirect Link to This Post
As an additive to composite layups?
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notaguru
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Report this Post05-01-2014 05:04 PM Click Here to See the Profile for notaguruClick Here to visit notaguru's HomePageClick Here to Email notaguruSend a Private Message to notaguruEdit/Delete MessageReply w/QuoteDirect Link to This Post
I have experience using EXPANDED PERLITE as filler in composite buildups - works fine. It's about 80% silicon dioxide (like glass) - the rest is mostly alumina. Quite inert under ordinary circumstances. Particles are typically larger than 100 microns, and the irregular/granular surface enhances interparticle bonding. Don't mix perlite with materials that react with alumina, unless you want that reaction.

Microballoon material (3M, for example) as filler is much the same, though it's nearly 100% glass and each particle has a smooth surface. The particles are so small (usually under 100 microns) that surface area is very high and therefore bonding is excellent.

BUT:
Expanded perlite is cheap (check Lowes or Home Depot for a large but light bag) and Microballoons are expensive.
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tesmith66
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Report this Post05-01-2014 07:49 PM Click Here to See the Profile for tesmith66Send a Private Message to tesmith66Edit/Delete MessageReply w/QuoteDirect Link to This Post
Microballons added to latex paint is a cheap Lizard Skin alternative. It can be used as a sound deadener and mildly effective heat barrier.
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Raydar
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Report this Post05-01-2014 11:19 PM Click Here to See the Profile for RaydarClick Here to Email RaydarSend a Private Message to RaydarEdit/Delete MessageReply w/QuoteDirect Link to This Post
The only application I'm familiar with is as a thickening agent added to glue to make a putty/filler. Model airplane applications.
My dad used to mix cabosil with two part epoxy, for much the same purpose.

From the web...
If you added a couple of tablespoons of Cabosil to say, an ounce of epoxy, it would greatly thicken it, to the "Aeropoxy-ish" consistency. To get epoxy to the same consistency using microballoons would probably take 4 to 6 times as much microballoons.

Since Cabosil is a thickening agent, the resultant "goop" is stronger (and heavier, and harder to sand) than the equivalent "goop" made with microballoons. So, I use Cabosil where I need strength, like at the seam on a molded wing, and use microballoons where I intend to sand, like a fillet.
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