Note: This is a popular frit and has been used for many years. Equivalents are made by many frit companies. The manufacturer says that it is "intended for use as a lime and borate source in partially fritted glazes, lead bisilicate glazes and low cost hobby glazes cone 06-10". 1450° F melting point. Replaces Pemco P54. Leadless high calcia borosilicate frit.