Glass is nearly invulnerable to chemicals and thus why it's the preferred material for chemical containers and reaction vessels. But when exposed to molten sodium hydroxide even glass will dissolve.
To perform the reaction a steel container is used as it's resistant to the sodium hydroxide.
For more information as well as the reaction equation check out the webpage at: http://sites.google.com/site/nurdrage/chemistry-experiments/dissolve-glass-with-drain-cleaner

































L
L
All your Instructables they are educational and useful.
I can't see the video at office, I must wait the night to see it at home. But I am not patient... and I have some questions:
1) When the glass is fused with sodium hydroxide, is it degraded in any way? Or can I expect a glass treated in this way maintain their properties in much?
2) Is there a part of sodium hydroxide incorporated into the glass? That makes it dangerous or corrosive?