Soft glass

Soft glass is a high COE (~90-105) glass commonly used in furnace glassblowing and for beads and jewelry. It is very prone to thermal shock (cracking) if heated or cooled too quickly.

Moretti, Effetre, Lauscha, and other "Soft" glasses are usually soda lime glass. They can be worked in an air / gas flame like a hot head or bunsen burner. Softglass is great for sculpting and bead making and solid work. Without a furnace and gloryhole it's rather hard to make elaborate hollow forms with softglass. The glass tends to be runnier and holds it heatbase much longer. Softglass is what is traditionally used in hotshops with large furnaces and gloryholes.... on a torch you're pretty much limited to rod and a few odd sizes and colors of tubing.

96 COE Glass - http://www.thegldg.com/wiki/96