Borosilicate (Boro COE 33) has exceptional clarity. Many manufacturers are mad right here in the USA with a wide range in rod and tubing sizes. It’s excellent for organic flowing shapes. Glass tubing makes glassblowing very easy.
This type of glass is made from both silica and boric oxide. Its manufactured for laboratory ware, domestic cooking and many kinds of technical. A high resistance of both heat and thermal shock is required. It is also used for low expansion-type glasses required to bond to metals and for glasses with a high degree of chemical resistance.
It requires a higher melting temperature, large torch, and oxygen supply. Click to view all materials