Might have some here mate what exact thickness are you looking for an what size ???

was that with pre preg? I was looking for someone to make me some 2 ply sheet or just an offcut to make a new visor mount for my momo helmet, as I left all my glass sheets in germany and theres nothing thin enough at work

It would be mostly down to the cure cycle you are using. Here I had to make a couple of single layer sheets. 

There's your problem, always apply to a cloth first then wipe onto the mould

Thanks for the tips




Yes i do use gloves, but i don't change the cloth for each coat. And i'm pretty sure i applied a too heavy coat as i just sprinkle it on the glass and then wipe down.

I found that is more of an application error. There's 3 main things that cause it:

Hy




now that i have a pin hole free surface i have another question.




Although the surface is smooth there are still some stripes visible from the release agent i think. I am using a frekote 770-nc.

Is there a way to get ride of this stripes on carbon fibre. And how/can I get rid of this problem when applying the release agent. I have tried polishing it with a smooth cloth by hand after the release agent has dried, but it seems that is not enough.




Thanks

Thanks Rob,




I taped the edges, and straight to 120C at 3 bar and the result is outstanding

no pinholes, really perfect glossy finish on both sides.

Well looking at the data sheet its a 42% resin material an a fairly standard cure (120,2 dag a minute ramp)

For a single ply you wouldn't need a dwell so straight to 120

but on glass you should be ok with 30psi to get the Finnish but still tape the edges off

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