Electronics Repair (sci.electronics.repair) Discussion of repairing electronic equipment. Topics include requests for assistance, where to obtain servicing information and parts, techniques for diagnosis and repair, and annecdotes about success, failures and problems.

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Default glass cement - what is it ?

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.


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Default glass cement - what is it ?

"N_Cook" wrote in
:

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)

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Default glass cement - what is it ?


"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


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Default glass cement - what is it ?

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/


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Default glass cement - what is it ?

On Dec 15, 12:24*am, "N_Cook" 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.
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