I hope I am posting in the right section.... I am involved in a project where I have to permanently attach (glue) tiny metal pieces to circuit boards that can be so strong to act like screws. I tried different material like epoxy, super glue, liquid nails, etc without success. After a short while, these pieces would come loose due to normal use. I can not use screws or solder to hold these pieces in place. It must be some kind of liquid material. What is the toughest, strongest kind of material can I use ? Thank you.

 

How about silicon glue that will form a head thru the mounting holes?

 

You say the parts come loose. How and where is the failure occurring?


If you've tried all those materials it sounds like you need to go a totally different route wither with a mechanical fastener or redesign it so the part is not overloading your ability to mount it. I know you're going to say "but I want/need this part right there and don't want to change anything" but not everything is possible. You've tried a wide variety of adhesives and they have all failed.

 

I like the redesign idea- thank you. I just thought there may be a "magic" material that is super strong that I have never heard of. Thanks again for your time.

 

I'd try PC7 epoxy. It's a 2 part paste that you mix together and its pretty thick. When it sets up it's like iron. I think it would probably work pretty good. You'd mix it up and put some on the board, then some on the piece and then push them together. I think it sets up in 30 minutes if I recall. Clean your tools with acetone.