Glue for FR4 boards

Go To Last Post
6 posts / 0 new
Author
Message
#1
  • 1
  • 2
  • 3
  • 4
  • 5
Total votes: 0

Hi boys:

Do you know of a glue suitable for gluing FR4?
I need to glue two FR4 bare boards (a Qmatrix keyboard and a smaller suplement board)
and the glue must resist the soldering without cracking or bubbling inside, because I need to first glue the boards and then send it to component mounting.

Experience? brands?

Thank you in advance
Nachus

  • 1
  • 2
  • 3
  • 4
  • 5
Total votes: 0

I suggest you find a high temperature epoxy then...

  • 1
  • 2
  • 3
  • 4
  • 5
Total votes: 0

Epoxy will do it, but you'll have to grind the solder resist off first, as nothing sticks to it.

  • 1
  • 2
  • 3
  • 4
  • 5
Total votes: 0

Years ago I purchased an adhesive whose sole purpose was to cement components into place before dipping the board in a solder pot. Once the parts were set the instructions required the entire board to be placed in the oven at 200 degrees F for 20 minutes then the board was supposed to be ready to be dipped! I still have it and will look up the name for you!!


This
product is similar to what I am suggesting...later today I should have the details on this heat cured epoxy!

John

Just some guy

  • 1
  • 2
  • 3
  • 4
  • 5
Total votes: 0

As john k says, some adhesives are commonly used for gluing smt components to fr4 prior to wave soldering. Often this glue needs to be cured in a reflow oven before wave soldering. Locktite 3609 http://www.farnell.com/datasheets/301458.pdf may be suitable for what you wish to attempt. I'm sure a experienced board house can help with your inquiry.

oddbudman

  • 1
  • 2
  • 3
  • 4
  • 5
Total votes: 0

Those component glues set soft and rubbery - it's quite easy to remove glued components for rework. They certainly withstand the temperature, but I wouldn't use them to glue two PCBs together along the edges, for example. They might do if one board is within the other with no projecting edges to catch.