Talk Composites - The Forum for Advanced Composites

epoxy expire date

http://www.talkcomposites.com/Topic8533.aspx

By rupert - 11/18/2013 1:19:54 PM

Hi, i have been buy your products for a few years now. I use the EL2 LAMINATING Epoxy with AT30 SLOW hardener.
I have a bottle which is around 10 months old, its unopened but i cant find a date on the bottle. Could you please tell me weather its still good to use ? / How long it should last for ?
Many thanks Rupert 
By Dravis - 11/19/2013 1:28:07 PM

I still had a small amount of West systems 105 leftover from my very first purchase in 2005 ... I did a test with new hardener, and it worked perfectly after more than 7 years!!

My conclusion is, that the Resin will last for years, if kept cool, dry and dark.  The hardeners however will not last much more than a couple of years, even when ideally stored.