glass cement - what is it ?

[N_Cook]

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/

 

[Jim Yanik]

"N_Cook" <diverse@tcp.co.uk> wrote in
news:ghufa7$t64$2@news.motzarella.org:

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/

Probably a UV-curing cyanoacrylate,or it could be an optical epoxy.
Edmund Scientific (edsci.com) has UV curing optical glues.(not cheap)

--
Jim Yanik
jyanik
at
kua.net

 

[Charles]

"N_Cook" <diverse@tcp.co.uk> wrote in message
news:ghufa7$t64$2@news.motzarella.org...

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

 

[N_Cook]

Charles <charlesschuler@comcast.net> wrote in message
news:gi445v$t98$1@news.motzarella.org...

"N_Cook" <diverse@tcp.co.uk> wrote in message
news:ghufa7$t64$2@news.motzarella.org...
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/

 

[whit3rd]

On Dec 15, 12:24 am, "N_Cook" <dive...@tcp.co.uk> wrote:

[about filter plate on high intensity lights]

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 -

Isn't waterglass brittle and corrosive (etching the glass as it
adheres)?
I think a flexible high temperature adhesive like RTV silicone
is a better prospect, and more likely.

Dichroic reflectors and UV or 'heat absorbing' glass are typically
used on projector lamps which get quite hot, the thermal
cycling would fracture a hard adhesive.