Black anti-static foam corrosion
Tothwolf
tothwolf at concentric.net
Mon Dec 5 21:19:32 CST 2016
On Sat, 3 Dec 2016, Fred Cisin wrote:
> On Sat, 3 Dec 2016, drlegendre . wrote:
>
>> 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.
>
> There are numerous black foam formulations.
>
> I inherited some lenses (including a Leitz Tele-Elmarit 180mm (<250
> made)) that had been stored for a few decades in an essentially airtight
> case with black foam. When I first opened the case, it seemed as though
> there was liquid in the case, with an intense vinegar? smell. Second
> time that I opened the case, a few hours later, it was dry and crumbly,
> and the outer painted surfaces of the lenses were badly pitted and had
> to scrape bits of the foam off, but NOT at all like water damage. It
> turned that lens from mint condition and a major rarity, into usable but
> POOR cosmetic condition (a loss of more than a thousand dollars in
> value!). (Three other cases had simply disappeared between the time my
> buddy died and the time that the county let us go through the house.)
Something similar happened with a Nikon FT2, Nikon EM, and some lenses
after a local friend of mine passed away in 2001. The same also happened
with his HAM radio gear, which I was supposed to get. For much of the
radio gear, I could likely come up with the model/serial numbers too. (We
know who took the HAM radio gear, but couldn't really do much about it.)
http://strudel.ignorelist
.com/~tothwolf/classiccmp/stolen_nikon_camera_gear.txt
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