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Cabosil Use in Laminates

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Rom

Well-Known Member
Joined
Oct 30, 2006
Messages
489
Location
Medina, Ohio
In the book Advanced Composite Techniques the author suggests using Cabosil (fumed silicon dioxide) in a 1 to 2 part ratio Cabosil to epoxy for laminating fiberglass fabric on a vertical surface.

I have been looking for information regarding it's affect on the weight of the finale product and the affect Cabosil has on the strength of the laminate. The information availible is to say the least, nonexistant. A hand layup will have around 50%-60% epoxy to fabric weight, does adding fumed silicon dioxide increase or decrease the the percentage of the epoxy matrix? Does the strength remain the same, decrease or what?

My motto is " Trust but Verify". If fumed silicon dioxide prevents the epoxy from running out of the laminate on a vertical surface, that is great, but are there any negative effects?
 
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