polyurethane glue

S

Steve Hayden

Joined
Mar 7, 2003
Messages
4,270
Has anyone here had experience with Polyurethane glues?

I am burnt out on mixing epoxy and would like to try something else. Elmer's puts one out called Probond and someone else has Gorilla Glue, they call these industrial grade adhesives. I haven't been able to find out specs like tensile strength and temperature stability range.

I don't really want to try it unless it is in the league with epoxy.
 
There are several types of PU adhesives on the market. In general comparison to epoxies they mostly have better impact strength but somewhat lower ultimate shear strength, some of the softer ones may have problems with low temperatures (they harden). If you use two component PU's be careful not to get the isocyanate hardener on your skin, the resin part is mostly harmless. On one part PU's they are premixed so dont get uncured adhesive on your skin either (once cured no problems). I prefer PU's on impact critical or sensitive jobs, one part formulations are also easy to use, no messy mixing.

TLM
 
My experience with PU glues is that they have a very limited shelf life after you open the bottle, less than a year. I think the reason is that the glue uses moisture to harden, and after opening water vapor will work its way into the bottle no matter how well you seal it. I've got a hard bottle of the stuff if you want proof.:grumpy:
 
That's true, the self lives are limited, a year is a good first approximation for two component ones, for one component it is more like 6 months.

TLM
 
I have stayed with epoxies because they have such good gap filling properties and the squeeze out is an indication of complete edge sealing. I have looked at PU glues and worried about getting a complete edge seal. The bonding characteristics however are outstanding.
 
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