3. Glass industry

Electric glass melting is mainly carried out by furnaces with direct current flow through the molten glass bath; however, indirect heating by resistors is used in a few special cases:

• leaded glass melting in closed-crucible furnaces, for low-volume production. The resistors used are made of molybdenum bisilicide (suspended from the refractory roof and arranged around the crucible, along the vertical walls of the chamber) or silicon carbide;

• heating...