Epoxy characteristics - expansion and contraction

[VADLAB]

I am using a 60 min set Loctite Epoxy. I am having a problem with the two parts which I am bonding together moving after curing. The parts are fine while clamped together but when pressure is removed, the parts rebound. Is this something anyone has encountered?

 

[VADLAB]

Does anyone have a suggestion of an adhesive which has a low linear shrinkage value?

 

[Compositepro]

You need to provide more information to get any reasonable response. I was going to wait until someone else felt like playing twenty questions.

To answer your second question, epoxy has about the lowest cure shrinkage of any adhesive. I infer from you question that you think that adhesive shinkage is causing your problem. That maybe the case, I can't say from what you've described. You may be using a heat cured epoxy and differing CTE (coefficient of thermal expansion) of your adherends and the adhesive maybe more the issue.

 

[carlossus]

VADLAB

It depends totally on your application. In my experience the faster curing adhesives (like domestic Aradite etc.) tend to be compromised in terms of shrinkage and strength.

I use Henkel Hysol EA9309NA to bond glass to Titanium and the shrinkage is very low. I cure at about 50C which gives full cure in only a few hours.