On Sun, 30 Nov 2014, Dale H. Cook wrote:
As with many things in this world, the quality of
varies greatly. I use foam which I bought in mats from a local
electronics distributor (since closed) about 20 years ago. I have some
ICs which have been stored in that foam for as long as I have owned it.
Their pins are not discolored nor are they stuck to the foam.
"quality" also as in TYPE.
The worst offenders of all have been the "Highest quality" and most
expensive of the foams.