"Joseph Gwinn" wrote in message
...
In article ,
"Paul K. Dickman" wrote:

"jk" wrote in message
...
pyotr filipivich wrote:



Okay, this I can understand. The need to clean up pollution. The
question I still have is - why would an industrial site in an
industrial zone, be required to be restored to being as pristine as a
day care playground?

Because it might be. You don't know WHAT that might be in 5 or 10
years.


Why is it that TV and Computers are consider hazardous waste
because of the lead in the glass? Is that going to magically leech
out of the glass?

AFIK, it ISN'T the lead in the glass, its the phosphors, and the lead
in the solder.


jk

It is the lead in the glass as well.
A 15" computer monitor has about a 20lb tube with 1.65 lbs of lead in it.
I has another couple of pounds in the other components.
Leaded glass dissolves fairly easily in a caustic environment. That is
why
you don't run the good crystal through the dishwasher.

Oh, but I do run lead crystal through the dishwasher. It works just
fine. Lead glass is very strong and stable. And I break far fewer
glasses than if I hand wash them, which I did for many years.

Joe Gwinn

It is not breakage. The strongly alkaline automatic dishwashing detergent
will etch the surface and they will loose their shine. It will etch regular
glass to, just not as fast.

From wikipedia
Lead crystal should not be cleaned in a dishwasher as the corrosive effect
of dishwasher detergent is high on such types of glass-that is, it will
quickly go 'cloudy'.
http://en.wikipedia.org/wiki/Dishwasher

Paul K. Dickman