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It may look the same, smell the same, and mix the same, but if the expiration
date has passed, you are no longer guaranteed that the cured Hysol will obtain
the advertised physical properties.  Unless you can get data from the
manufacturer stating how the properties deteriorated with age of unmixed
material, I would not use it on critical applications.  You simply will not know
how much strength you may be loosing.  I have kept various epoxies around for
years after their expiration dates and used them on projects where strength was
not an issue.  I never had a batch not cure, but I certainly would not interpret
that as meaning the batch had obtain full strength.
Chris Zavatson
L-360 std
N91CZ
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Please send your photos and drawings to marvkaye@olsusa.com.
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