Nick Davison
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| posted on 2/8/03 at 09:02 AM |
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Resin for carbon fibre
What type of resin do I need for carbon fibre cloth?
The standard resin I use with class fibre has a green colour which would spoil the look of carbon fibre.
Nick
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Spyderman
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| posted on 2/8/03 at 10:13 AM |
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I would have thought that the faint tint of the Polyester resin would not be noticable with CF unless you are using it for a gel coat.
If the CF cloth is going to be the topmost layer (no gel coat) then the colour should not a problem. Try a small sample first to see, but don't
compare it to the bare CF cloth.
Spyderman
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Spyderman
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| posted on 4/8/03 at 11:36 AM |
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I suppose it depends what kind of finish you want and where it will be.
To be honest I'd have thought that using a clear gel coat would be the best option, but until you have tried a sample you won't know which
would be best for what you need.
The trouble with other peoples opinions is that they are "other people's"! 
Experiment!
Spyderman
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ProjectLMP
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| posted on 6/8/03 at 04:02 PM |
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Polyester resin doesn't work too good with carbon (and is useless with kevlar). The best option would be epoxy (which is also pretty clear) or
vinyl ester (sort of a cross between epoxy and polyester).
Home of the Astronomicalcost Mid engined LMP project
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suparuss
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| posted on 12/8/03 at 09:08 PM |
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Epoxy is used for carbon fibre for its gap filling properties, you cant get carbon fibre mat, so you need something a little thicker because the
layers wont bond together properly other wise. when using glass cloth, mat is used between the layers because it will squish between the voids in the
cloth.
vinylester is basically the same as polyester, but has better elogation (making it more bendy and less brittle)
and has better chemical resistance.
you can use the epoxy resin as a gel coat as its is usually clear, and is hard enough anyway, trouble is, i dont think it is air inhibited, so if
doing it in a number of coats i would check if it will bond to its self properly when cured. carbon fibre is usually baked under pressure, or vacuum
cast, i guess it depends on how critical the part is.
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MK9R
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| posted on 13/8/03 at 06:08 AM |
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I was told by a supplier that the normal polyester resin would be fine to use (if its looks only you are after), but to makesure you buy the clearest
(is that a word), and probably the most expensive, polyester resin otherwise it will look cloudy. Just use carbon for the first layer then strengthen
will normal fibre glass matt
Cheers Austen
RGB car number 9
www.austengreenway.co.uk
www.automatedtechnologygroup.co.uk
www.trackace.co.uk
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flip
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| posted on 15/8/03 at 07:03 PM |
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gelcoat
if you can, use gelcoat but spray it on. do not brush it. spraying will leave a very thin and smooth surface which will produce a better finished
product. i know some people also laminate a very thin layer of glass mat before applying the carbon. (almost glass tissue) i am not sure why, but it
could be something to do with getting rid of air bubbles.
i would use a normal polyester resin, but make sure you get one which is highly transparent.
if it is looks you are after then try looking into Multiaxial Fabrics instead of normal woven mat. there are more expensive but can look great if
layed up correctly.
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dozracing
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| posted on 18/8/03 at 08:17 PM |
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Try looking at SP system Sprint material. Its easy to work with gives a good finish and is a pre-preg so its got no messy resin to dob on. When you
have laid it up bring it to me and i'll vac bag it and oven cook it for you. It'll be the best and lightest part you'll affordably
get in carbon.
Kind regards,
Darren
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Nick Davison
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| posted on 19/8/03 at 12:36 PM |
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Thanks for that chaps.
I initially want to make a dashboard and may make a few other more complicated parts if it all goes well, I think pre preg is probably too advanced
for my requirements and unnecessary as the components will not be in stressed areas. However the offer of auto claves is interesting, I only wish I
had the time and money to experiment more!
I will do a trial sample with what I have which will point me in the direction for improvements.
Many Thanks
Nick
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