Interesting find, thanks for posting this. I've seen this as well. with a batch of old ICs which had been stored (in black foam) for some 20-30 years. The leads kind of just stayed behind in the foam..
My assumption was that the foam was simply hygroscopic, and held enough atmospheric moisture & pollutants to foster corrosion. On Sat, Dec 3, 2016 at 9:06 AM, Al Kossow <a...@bitsavers.org> wrote: > > I was curious what the compound is that corrodes IC leads in old black > anti-static foam > > adipic acid > > https://www.febo.com/pipermail/time-nuts/2008-July/032531.html > > and google for polyurethane and adipic acid > > https://www.jstor.org/stable/20619421 > Corrosion on Metallic Tokens Stored in Polyurethane Foam > > >
