[ATM] Lightweight glass

[Vladimir Galogaza]

Jim,

>Has anyone tried to lighten large glass blanks by entraining the glass 
>with air bubbles instead of with some sort of honeycomb arrangement?  A 
>pre-curveded glass "foam" blank could be topped with a thin layer of 
>bubble free glass for grinding/polishing. 

The idea was tested by David Davis on foam glass.
He reported on it extensively and you can find it in archives.
Here is small quote from his mail:

> I am working with some material called foamglass.
> It is an industrial insulation made of glass that has been foamed up with
>trapped gas.  I have successfully fused a glass face onto a pre-curved
>puck of the foamglas material. 

If you are interested in details David is available at:
vorblesnak at peak.org

Regards
Vladimir.