Hi,

this is a returning subject imho. If you have a UV box of unknown
provenience and want to erase windowed parts with it, make sure that it
has clear tubes (not bulbs) inside and that it makes a bit of ozone smell
when turned on (don't look into the lamps when they work !). If it passes
these two tests then it should erase EPROMs and PICs within 20-45 minutes.
The chips should be placed very close to the tubes (withing 1 inch or even
contacting the lamp envelopes). The chips will be safe if they do not
exceed the storage temperature (which is well above 100 degrees C - not
likely to be reached unless you shine a high pressure mercury vapor arc
lamp onto them - which is what I am using incidentally, but please do what
I say, and not what I do ;-) ).

hope this helps,

        Peter