Glass Scrim Ply


Glass Scrim Ply
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pkcomposite
pkcomposite
pkcomposite
posted 10 Years Ago HOT
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Hello all,

I'm new to the forum and will shoot right to my question:
What is the purpose and effect of glass scrim ply (106 overlay to be exact) on top of carbon laminate?
The carbon laminate is a two ply 0/90 uni that is used for honeycomb sandwich panel skin.
One of my need is surface resistivity to not exceed x ohms per square - this is not achievable with the presence of glass scrim.
Removing that the carbon fibers are now exposed to external damage but other than that, what else?

Thanks.
Edited 10 Years Ago by pkcomposite
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pkcomposite
pkcomposite
pkcomposite
posted 10 Years Ago HOT
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Dravis (08/01/2015)
Are you referring to a commercially purchased cured CF sheet ?  Depending on the intended use, I do not think a glass "scrim" on top of the CF is needed, but to keep a very low resistivity / high conductivity of the actual surface, you will probably need to leave some of the carbon fibres  exposed ... how that affects the surface properties of the sheet i do not know ..

However, if I were to build with your "constraints" on the design I would incorporate Nanocyl "Epicyl" carbon nanotube additive in the top resin, this leaves the resin itself highly conductive, thoug the actual values probably will need to be tested ...  This has the added benefit of a substantial increase in strenght of the laminate  ... It does not work all that well with infusion resins, and only with Epoxy ..


Thanks for the reply.

I'm actually working with my supplier who is a HSP vendor, whom produce various HSPs using prepregs and cores they procure. 
Thus the carbon laminate in discussion here is actually in prepreg form which is pressed together with other materials at certain temp. This implies that use of nanotube additive is probably out of the equation since it would drive the cost way up.

But it is good to know what the "scrim" does not really provide anything structural.

Edit: How about galvanic corrosion? Will removal of glass cause any of this in service?
Edited 10 Years Ago by pkcomposite
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Glass Scrim Ply
pkcomposite - 10 Years Ago
     Are you referring to a commercially purchased cured CF sheet ? Depending on the intended use, I do...
Dravis - 10 Years Ago
             [quote][b]Dravis (08/01/2015)[/b][hr]Are you referring to a commercially purchased cured CF sheet ?...
pkcomposite - 10 Years Ago
     Calvanic corrosion will only occur if you have conductive (uncovered) carbon fibre in contact with...
Dravis - 10 Years Ago
             [quote][b]Dravis (09/01/2015)[/b][hr]Calvanic corrosion will only occur if you have conductive...
pkcomposite - 10 Years Ago

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