All of my work is borosilicate (boro) glass melted and blown on a torch. Boro is the glass used in Pyrex kitchenware. It is stronger and lighter than common soft glass used in most windows, drinking glasses, and art glass made in a furnace.
Boro can be worked much thinner than soft glass. Thin boro has a unique elegance and beauty and is stronger than expected. Thick boro is much stronger and less breakable than soft glass with comparable thickness. Unlike regular silicate glass, borosilicate is resistant to temperature change because it does not expand and contract.
Invention of borosilicate glass is generally credited to Otto Schott, a German glassmaker who worked in the 19th century. By the late 1800s, the process for making it had been refined, and in 1915, a famous line of borosilicate kitchen products was released under the Pyrex label. Because it is stronger and more durable than conventional glass, it has a number of far reaching uses. This glass is not invincible, of course. It will crack if subjected to very sudden and radical temperature fluctuations, or if it is dropped. The glass is more likely to crack or snap than to shatter, however, making it safer to have around in a situation where breakage is a concern. In the event that products made with the glass do crack, it is generally easier and safer to clean up than shattered glass.