Interesting question. Where I worked for many years we had very specific shelf life manuals on things organic like epoxies and paints and plastics. I'm not sure if I recall any shelf life on resin core solder. I have had rolls of the stuff that were 25 years old before they were used up, and I never had a problem. I'd avoid high humidity because of the tin/lead oxidizing, but the flux inside is pretty well sealed up. Al WA6VNN
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