Silane for resin/silane for epoxy - RC Groups
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Jan 30, 2013, 08:48 AM
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Silane for resin/silane for epoxy

Curious to know if anybody has ever used the 3/4 glass from thayercraft they have listed for resin rather than the smaller, narrower glass listed for use with epoxy.

What is silane? Is it simply a wetting agent or similar?
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Jan 30, 2013, 12:53 PM
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David Forbes's Avatar
Yup, I've used it, it works fine for our uses with epoxy. Here's info on the finishes used on FG
Jan 30, 2013, 03:38 PM
Just fly it!
wyowindworks's Avatar
Silane is a finish the creates a molecular link between the resin and the fiberglass
Jan 31, 2013, 04:39 AM
Entropy is happening!
Jim.Thompson's Avatar
Does it increase strength of the layup? Or simply make wetting out easier and more reliable?
Jan 31, 2013, 05:57 AM
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Looks as though it does strengthen Jim
From the link David provided :Finishes are put on glass fabrics to allow a strong bond between the resin and the glass. If you take a sheet of glass and put resin on it, let it cure then try to peel it off it will easily come off, or chip off. Finishes like Volan or Silane act as intermediaries between the resin and the glass. Volan has been around a lot longer than the Silanes but I think is still one of the best finishes. Volan is generally the softest finish with the exception of some Silanes.
Jan 31, 2013, 09:13 AM
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All of the above is correct. I don't think silane could be called a wetting agent in the same sense as soldering flux, it's only purpose is to increase bonding strength between epoxy and fibre. If it does help with wetting, that's only a fortunate side-effect. I have not researched this aspect, so can't really comment if and how much effect it has on wetting properties. All of the fabrics that I am aware of are treated with silane or some equivalent stuff.
Feb 06, 2013, 03:41 PM
Registered User
IIRC, the various finishes reduce the strength of the glass fibers, but increase the strength of the bond more than enough to compensate.


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