From: John Cremati (johnjohnc@core.com)
Date: 09/30/02-11:19:39 PM Z
This is the information on Shott white glass... It is superior to regular
glass in UV transmission... Although not quartz it a great alternative to
glass according to the specs...Quartz would be the schnitz though...John
Cremati
Dear group-members,
For those who are really interested in the exact physical and chemical
properties of a sheet of glass with a high UV transmission :
0% at 280 nm
14% at 300 nm
65% at 320 nm
85% at 340 nm
>90% from 360 nm and higher. thickness 2.0 mm
you can e-mail to michael.quidde@schott.com and ask him for the
specifications of Schott B270 superwite crown glass.He will send you a large
attachment (~800 kB) to his answer.
The internet address of an U.S. supplier is
http://www.howardglass.com/B270.html
Erich
----- Original Message -----
From: "Ken Sinclair" <photo1@telusplanet.net>
To: <alt-photo-process-l@skyway.usask.ca>
Sent: Monday, September 30, 2002 11:37 AM
Subject: Glass
>
> A friend is building himself a larger contact printing frame for his 5x7
> negatives, and has asked me to inquire as to the best glass to use.
>
> My first thoughts were to suggest plate glass for flatness and
strength....
> However, a month or so ago I saw an eBay auction for sheets of glass with
a
> "higher" UV transmission, but, since "I" was not in need, did not take
note
> of the vendor.
>
> Can anyone make a better recommendation.. manufacturer and "type" or
> "number" of glass that would be best to install?
>
> Regards,
>
> Ken.
>
>
>
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