pre-preg pinholes.. driving me crazy


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roger sbk composites
roger sbk composites
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this is the third part that comes out exactly the same and i've done 3 diff things so far.... my kitchen oven minum is 76c so i leave that 2 hours and then take it to 110c this time i added peelply on the edges but nothing... the stack is as fallowed  2 layers of pre-preg aviation no face side... ... eassycomposite unperforated release film and breather all over the mold put inside a bag and full vac... any ideas guys... this is dirving me crazy already 


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roger sbk composites
roger sbk composites
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thanks guy.. ive seen that video im subscribed to you... i know about the eassy preg... the problem is the client wanted this rear hugger plain weave and i havent been able to find plain weave pre-preg that will work... so i had to use this crap... the third part had acceptable pinholes i could live with apart from the bridging... morepower on the sides of the hugger did you cut the fabric to be able to layup first the sides then the middle part???  with infusion i was having problems too i was getting 3d looking c.f from the bridgin so i cut pannels out... but do this to plain weave i dont think it would look good

morepower
morepower
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Yes I cut the sides and matched them in.... Plain weave is harder to find I use a plain weave but it is a lot more prone to pinholes than twill and you have to be 100% with everything you do to get it pin hole free or almost pinhole free... The layup has to be perfect, the breather stack and curing schedule has to be followed exactly every time. If the bag is not perfect it has some pinholes... I leave the pump running on the bag for the full cure and still find if there is a slight leak it is OK but you find some pinholes....
Matthieu Libeert
Matthieu Libeert
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The thing you could do is use easypreg finishing layer behind that plain weave to add some resin rich fabric to maybe get a better finish and less pinholes

Matthieu Libeert
Founder MAT2 Composites X Sports
website:
www.mat2composites.com




morepower
morepower
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matthieutje65 (20/01/2014)
The thing you could do is use easypreg finishing layer behind that plain weave to add some resin rich fabric to maybe get a better finish and less pinholes
 

That may work but I have been told more resin does not always mean less pinholes.. I have used a material that was resin rich and pinholes were the same as other less resin rich material. The plain weave I am using at the moment is 42% and gives a great finish.. But as I said it is not easy to find that point where it all works... Plus Plain weave is a lot more prone for pinholes...  
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roger sbk composites - 11 Years Ago
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roger sbk composites - 11 Years Ago
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     Cool design :-)
Djekouk - 11 Years Ago
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roger sbk composites - 11 Years Ago
Djekouk - 11 Years Ago
                 No problem let go on pm
roger sbk composites - 11 Years Ago

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