On Sun, May 1, 2022, 12:10 PM Jim Higgins <HigginsJ@...> wrote:
At 5/1/2022 18:45 UTC Norm Stewart wrote:
>Another peroxide question: how long can unopened peroxide be stored? Does it
>deteriorate? Some time ago I got a quart of 35%, then got sidetracked. Is it
>still usable?
Obviously depends on how long "some time ago" has been.
I used to work in a lab and unopened 35% peroxide should be plenty strong
even after a year... though I never bought more than a month's supply at a
time... simply because I didn't want that much of it on hand. For commercial
lab use, rules in the USA require it to be stored in a heavy cabinet intended
for storage of oxidizers.
It's potentially really nasty stuff that has no place in home PCB etching...
except by folks who know very little about it and think more is better. It
really isn't.
