[Laser] UV Sheet???

[laser@mailman.qth.net]

A while back I bought a sheet of IR lexan.  This sheet
is black in appearance and blocks 99.9% of light
visible to the human eye while passing IR.

I am in need of an equivelent in the UV range. 
Searching the internet reveals IR filters, which block
UV!  This won't work, I need somethig that blocks most
visible light and passes UV, the equivelent of a very
dark black light but in a flat material I can cut
lenses from.

I have found UV bulbs, but they look like a white light
with a blueish tint to them when lit, I need something
that appears almost black or a very dark almost
invisible purple to the human eye.

Is there anything out there on the market?

What would something like this be called?

What/Where should I be looking?

Kurt