What glue to use for carbon fiber drag washers

[oldmanjoe]

 What glue are you using for glueing carbon fiber to aluminum plate in lever drag reels .

[Marlinmate]

i've used West Marine GFlex 2 part epoxy to glue an Avet drag washer back to the spool.   No issues.

[oldmanjoe]

  Thanks for the reply!   Funny thing is I just tried J B weld 2 hours ago , I will know in 22 hours if it works .

[Marlinmate]

please report back with your findings

[alantani]

the best stuff is loctite depend 330.  it's expensive and difficult to use.  the last time, i used a simple 2-part epoxy. it worked, but i told the guy to get back to me if it fails. 

[jurelometer]

the best stuff is loctite depend 330.  it's expensive and difficult to use.  the last time, i used a simple 2-part epoxy. it worked, but i told the guy to get back to me if it fails. 

I have done this repair on exactly zero reels, but as someone who plays with adhesives, i have some questions:

Curious as to what makes Loctite 3030 the best.  It is an acrylic with a maximum operating temperature of 212F according to Loctite.  It is also a flexible bond, which doesn't seem particularly desirable where shear strength will be the greatest challenge.  Loctite positions this as a good multi-material adhesive which is  a plus.

Expoxies are going to do very well in terms of bonding stainless steel or aluminum to bare carbon fiber (drag washer surface).   Typical epoxies will have a max operating temp around 250F, which would include the West Systems G Flex, which is also a flexible adhesive.

Just going with the materials and usage requirements,  I would have looked for a high temp epoxy (some readily available products include high temp flavors of JBWeld and Permatex) that support temps over 400F, had high shear strength ratings (rigid not flex), and strong resistance to lubricants and water.  Also want something that is not too thick of a paste that  it makes it difficult to get a flush fit for a flat final surface.

i am probably overthinking it, and any adhesive that gives you a flush fit and a reasonable amount of shear strength is going to be good enough.   Although the drag surfaces are going to risk getting up over 200F, it is going to be for a matter of minutes and not continuous operating temperature.

[Edit: maybe a bit of flex is not too bad.  Drags go  back and for between lower and higher compressive loads.   Since there is probably some spring/compressabilty in the drag washer itself, the adhesive might stay  bonded a bit better in the long run if it is not too rigid.   Dunno]

-J

[oldmanjoe]

  J B weld , strength of 5020 psi and 550 degrees fahrenheit  .    I have cooked J B to 475-500 degrees a few times already , it works .

I am trying the twill weave here , I did not have a big enough piece of plain weave .
The original brake disk is Ferodo brake pad , Organic material with a little metal strands.

I will make another disk to try another material and do testing .   I was able to pick up another drag lever with the thrust bearing for more testing drag ramps

   Once I get all my ducks in a row , I will do testing.

[Donnyboat]

I have megapoxy 69, I give it a couple of days to set, once the 2 parts are mixed, and applied you can move the carbon fibre into position easy, I then place some weight on it, megapoxy is good to work with, its not as runny as araldite, cheers Don.

[alantani]

Curious as to what makes Loctite 3030 the best.  It is an acrylic with a maximum operating temperature of 212F according to Loctite.  It is also a flexible bond, which doesn't seem particularly desirable where shear strength will be the greatest challenge. 

that i didn't know.  somehow, i had the idea that accurate or avet used this.  that's gotta not be the case.  this was so long ago. thanks for the correction!!!!!