Minimum Energy Requirement For Melting Lead Crystal And Borosilicate Glasses

The minimum energy requirement for melting batches of a typical, laboratory borosilicate and a 24% Pb0 crystal glass were determined using the drop mixing method. Measurements of the heat content of cullet of the glasses were also made. The results are compared with those obtained by thermochemical calculation assuming various reaction paths and calculated values for typical soda-lime-silica glasses; the differences being discussed.