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Default An Epoxy Glue that Keeps After Opening?

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jim evans wrote:

I need a small amount of epoxy glue every 3-6 months. The problem is
the last one I bought usually drys out by the time I need it again
So, I have to buy the tubes again when I need it. Is there any way to
buy this stuff that I can reuse it for a year or so?


Agree with other respondents about epoxy having a long shelf life. But,
it is not indefinite. Industrial epoxies contain an expiration date.
After that, the resin part may start to become stringy and grainy. In
some applications that may not be a problem. In many it is.
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Default An Epoxy Glue that Keeps After Opening?

On Jul 14, 9:24*pm, Smitty Two wrote:

snip


Agree with other respondents about epoxy having a long shelf life. But,
it is not indefinite. Industrial epoxies contain an expiration date.
After that, the resin part may start to become stringy and grainy. In
some applications that may not be a problem. In many it is.


My experience with epoxy resins dates back to the 60's. I still have a
few filled formulations I prepared back then that are still perfectly
functional. I have never seen an expiration date on an epoxy resin
from any major supplier (as opposed to commercial formulators). IMO
the formulators probably use fillers that are somewhat reactive and
can cause premature semi hardening of the systems. True epoxy resins
like the Epon 826 that I work with, are so pure that they will
crystallize, but are easily warmed in working batch size by a few
seconds in a microwave. I find it surprising that people will put up
with the aggravation of twin tubes and such, when a small postal scale
will permit precise quantities with so little fuss. Over the years,
the resins and hardeners have improved steadily and what used to be
distinctly yellowish colored materials are now nice water white, just
what the paint formulators always wanted. My nickels worth...

Joe
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