Total weight of resin and carbon cloth


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CurlyHutty
CurlyHutty
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Hi - I have searched for the answer to this - to no avail.  I would have thought it was an FAQ ...

Are there any rules of thumb to estimate the total weight of a carbon-fibre layup i.e. the weight of the carbon cloth plus the resin?

E.g:
1 layer of 200sgm CF including wet-lay epoxy = XX gsm
2 layers of 200sgm CF including wet-lay epoxy = YY gsm
3 layers of 200sgm CF including wet-lay epoxy = ZZ gsm

Is there a 'standard' ratio of CF to resin?

I only plan to make flat sheets, wet-lay, not infusion, but with pressure to squeeze out as much epoxy as possible.

I am planning to make some aero parts so weight is important.

Thanks!  CH
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Zorongo
Zorongo
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I always mix same resin as cloth by weight for small parts. Or a bit lower. And is more than enough.

Part of the resin will remain on your roller, part on the tray and part on the mixing pot and stick.





So, from the weight point of view is easy to reach ratios close to 100 / 85 and a bit lower ( being 85 resin amount ) for plates and medium to big size parts.

100 / 100 is OK for small parts, where resin used on try, roller etc represent a high amount on the total ratio.

If weight is VERY important, work your roller hard, "dry" it before impregnating the fiber, and squeege after impregnating.

Limiting your mix amount will make you roll harder. Will push you on the resin reduction direction. And you'll earn a bit of money.

Limiting your resin ratio is OK If you have a good consolidation pressure, which will help / improve interlaminar bonding.

Those ratios will leave any pinholes on your part´s suface.
CurlyHutty
CurlyHutty
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Brilliant - thanks folks.
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