Our Homasote® is a 1/2" thick dense cellulose fiber composition workboard.
The board is soft enough to serve well as a surface for cutting glass.
It accepts push pins well, so is also good as a layout board to assemble your foiled or leaded projects.
And, it is heat resistant (not flame-proof), allowing you to solder on it.
Sold as one 16"x24" piece. Larger pieces are available upon request.