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To Get some answers on Epoxy I Called Composite
Polymer Design The Maker OF Easy Epoxy 83-87
I spoke to the Technical Director and got these
Recrystallize often can happen just from
To Decrystallize the hardener heat it to
140 -150 Deg F. And then stir
Do not exceed 180 Deg F.
Hardener has a 1 year shelf life Guarantee but
should be good for 2-5 years if kept in a sealed
container . IF exposed for more than 2 weeks to
out side air Discard. He also said they have had
hardener around for more
then 5 years with no ill effects
There is no silver nitrate in the Hardener. The
Color change is from moisture getting in to the hardener.
and no heating will return the color. That is
why you need to keep the container sealed.
If the hardener turns dark brown that dose not
mean that it is nessasaraly bad the way to
tell if it has gone bad is by testing the
strength or by watching for extended cure times.
Post cure is at 150 deg for two hours to reach
or full cure is about 1 month witch is why it
may darken if the humidity is high and it
was not post cured in that month. But post
curing adds no strength.
This is what I was told form the people how make