[ccp4bb] Lindemann glass

[James Holton]

Does anyone know the formula or supplier of what was once called 
"Lindemann glass"?  It is a silicon-free high-boron glass that has no 
elements in it heavier than oxygen.  Used to be used to make clear x-ray 
windows, but now I can't find anyone who sells it.

-James Holton
MAD Scientist