4 Dec
2016
4 Dec
'16
2:51 a.m.
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 <aek at 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