I wrote a letter to Royal Sovereign asking them what the materials were in their laminating pouches. The outer film that is in contact with the stamps is NOT acetate, so there should be no problem.
That may not be the case with other brands. I suggest writing to the manufacturer if you have a question about it. Being acid-free doesn't mean being safe for ezmount.
Quiltzi...High Plains Member of PunchkateerzI'll stand with arms high and heart abandoned,
in awe of the One who gave it all.
I'll stand, my soul, Lord, to You surrendered,
all I am is Yours.
Feb 7 Mini
Mar 7-8 Main