So I’m building a speargun and I need to use some Kevlar which is not prepreg on top of prepreg carbon. Will I have to wet the kevlar like normal or will the prepreg adhere to the Kevlar and “lend” it’s resin to the dry Kevlar?
Thanks in advance!
Prepreg is usually impregnated with the required resin volume for that specific weight of carbon, so, unless you found over impregnated pre-preg, you’d need more resin to have the correct and needed fiber to resin ratio.
Do you have glue films available? Put it on the kevlar (the right amount ofcourse) and do a testpiece first.
Where might I find something like that! Sounds like that’s exactly what I need!
This will work great if your Kevlar is kept minimal and you have a few layers of pre preg carbon to lend it’s resin.
I use preg (1 x 200g carbon) with foam cores and no film glue all the time and this works fine too.
maybe consider using a structural adhesive film
such as a bms 5-101 type 2 (AF 163) many cure temps to chose from
sourcing it out in a small quantity will be tough, but not unobtainable
Go with an adhesive film which should be available from the same place you got your pre-preg: Look up resin film infusion. I use this method a lot when Im working with epoxy resins but want a unique fibre (when I say unique I mean anything where I cant get pre-preg economically in small qunatities) in there such as twaron, diolen, carbon/kevlar hybrids,etc
See the attached picture for an example: You can do this with multiple layers as I often do but all my other photos are commercially sensitive sorry!
Oh…and a close up of the finished surface attached now
You might be able to get away with using a non-net-resin prepreg, laying the dry kevlar on top and cooking it. It will leave a dry finish, but you might be able to put wet resin over top, and then finish as a normal wet-layup part.
You can use a resin film(prepreg) in between the kevlar fabric and Carbon prerpreg. We supply 80 gsm super thin resin prepreg
Why not use Kevlar Prepreg instead?
http://www.cacomposites.com/kevlar--prepreg.html