The development of a dissolution model for quartz in vitrified alumino-alkalisilicate bonding systems has been investigated. The model has been developed so that heat treatment cycles can be formulated that eliminate the harmfiul effects of residual quartz. The complete dissolution of quartz increases the efficiency of vitrified grinding wheels by reducing the likelihood of bond fracture. The loss of strength in the bonding system is caused by the displacive transformation of quartz at 573 degrees C.
