carbon wet-out consistancy issues.


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jono
jono
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hi all, i'm having issues with the final part not wetting out enough consistently. I am using the same mould, same layers, same resin and temperature conditions. absolutely no leaks in the bag and obviously the same vac pump. it visually appears to infuse at the same rate every time but only 1/3rd of the time it's actually fully wetting out the weave. it seems to be luck of the draw for me? i'm using a low viscosity resin, pulling a vacuum for at least 40 mins before infusing. i've tried clamping off the vac line and resin line like the easy composites tutorial, i've also tried allowing the resin to almost empty the pottle and only clamping the resin line and allowing excess to reach the catchpot and letting it cure wit vaccuum pump going. also moving around the resin feed/vac lines. i honestly have no idea what the cause is. would appreciate any help here.

this is what my parts come out like 2/3 of the time.




yet sometimes my parts come out perfect like this (same exact mould)-ignore the traces of clay on it-




any idea what could be doing this? i'm doing a fully dry layup, no glue or gel coat (its a brake duct) should i perhaps consider brushing/spraying a fine layer of resin down and allowing it to almost fully cure to a late stage of tack and then layup/infuse? 
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jono
jono
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Posts: 11, Visits: 63
thanks for some very good points. i have not been slowing down the resin at all. i will definiatley try this next time.

 the temperatures i'm infusing at is ambient, always over 25deg celcius. 

i have been degassing the resin for about 5 minutes usually. sometimes you can watch micro bubbles come through the feed line. but very, very small.

the mould i am using is a 2 peice mould. its firmly bolted together also having the split line sealed with a thin line of clay acting as a gasket between the two and then put in a massivly oversize vaccum bag to insure no bridging, even on the reverse of the mold. i have been doing at least 30 minute leakdown tests as well. 

i have constant access to a paint oven, would it be worth doing the infusion process in there? we can reach temps of 70deg celcius (not fun to be in there at that though)
GO

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