To understand fully the unique properties of the different types of cellular glass, it makes sense to read some more didactic books for glass science. I found these books on the Internet and I guess I am allowed to mention them.

The first work I like to advise is the under graduate student book of James E. Shelby. I got sympathy for the book by its definition of a glass: A glass can be defined as “an amorphous solid completely lacking in long range, periodic atomic structure, and exhibiting a region of glass transformation behavior”. Any material, inorganic, organic, or metallic, formed by any technique, which exhibits glass transformation behavior is a glass.

The second work is a little bit more academic. About glass is a shorter but more difficult version of the above one. 

Cellular glass can be foamed from different glass compositions. The history of the glass composition is the perfect introduction how the world evolved from colored glass beads to optical fibers. This topic is interesting because cellular glass is the best method to recycle all kinds of glass.