Jeff Urban wrote in message
...
Sunglasses ?

More realistically, we have all seen those super insulated argon
filled windows and doors.

Some of them are not totally dependent upon the gas fill for their
insulative qualities. Some of them are also metal evaporated or metal
sputterred on the glass. This makes them reflect IR, near and far
actually as it is to be heat insulator.

These doors/windows are quite expensive, but maybe you could find one
that is broken and just take the glass you need. Any of the pieces
could be large enough. I have seen these and I get the impression that
they are like crown glass, which is softer. This depositing of the
metal might not work as well on flint type glass. That is just a
guess. Hell it could be a film.

Tell you what else, I just remembered the name - REFRACTORY. This
refers to a furnace. Companies that run or build refractories might
have what you need. When they close the door to a furnace and kick it
up to a million degrees, they do not need sunburnt eyelids from
looking through the glass. Maybe some kilns have something that'll
work also, who knows.

Well, I just threw a few ideas out there. Might work or not.

J


I just tried some mylar film , shiney side out but the IR passes and display
not really visible in normal light