Hy




I have a problem, which i do not know how to solve. For my application i need a thin sheet of carbon fiber that is perfect finish on both sides.




I am using one layer of deltapreg 200g prepreg and vacuumed between two glass panells and than baked in autoclau on 4bar. The problem is no matter what i try i get pinholes on both sides, which are not acceptable. I have also tried with drg carbon with resin and the result is similar.




What can i do to get rid of the pinholes on both sides and get a perfect finish?

Hy the carbon fiber si twill 200g/m2, and the technical data sheet of the epoxy is here http://www.delta-tech.it/pdf/STE%20DT120-6.pdf




What i found is that nearer the edges there are less and less pinholes, to about 2cm from the edge there are no pinholes left.

The main focus is that we get rid of this pinholes on both sides and is not important structuraly.




And another thing that i found out is when i put the glass panel on just one side, the surface was perfect and pinhole free.

How would you recomend the autoclau cycle (pressure and temperatures) to give the best chance of getting what i want.

And also i am wondering what is causing the pinholes. Is it gas forming in the epoxy that can't escape, or is it epoxy bleeding out.




F1rob




Yes the carbon fiber sheet is the same size as the glass panels but i didn't flash tape around so I Will try that also, if the problem is resin bleed.




Regards