Charles wrote in message
...

"N_Cook" wrote in message
...
The cement used to fix the UV filter glass discs to the front of
dichroic
lamps etc, so high temperatures. It is clear , maybe a silicone type
material.


--
Diverse Devices, Southampton, England
electronic hints and repair briefs , schematics/manuals list on
http://home.graffiti.net/diverse:graffiti.net/

http://www.infoplease.com/ce6/sci/A0851590.html



I think you're right. I'd forgotten about waterglass. Once you make a
purchase under the lamp cover disc it comes away fairly easily. I did not
realise that waterglass can tolerate such high temperatures - even a major
non-sand component of foundry casting sand even.
I'd forgotten I used it a long time ago to stick a glass patch over a bullet
hole in a sheet of window glass, otherwise I've just used for disguising
scratches on 'scope CRT screens. Incidently there must be some medical use
for it as I got a pint of it from a dispensing chemist.


--
Diverse Devices, Southampton, England
electronic hints and repair briefs , schematics/manuals list on
http://home.graffiti.net/diverse:graffiti.net/