Izitini ze-mullite ezinesisindo esincane ziqukethe i-porosity ephezulu, engasindisa ukushisa okwengeziwe futhi ngenxa yalokho inciphisa izindleko zikaphethiloli.
I-refractory mortar iwuhlobo olusha lwezinto ezibophayo ezingaphili, ezenziwe ngempushana enekhwalithi efanayo nesitini esifakiwe, i-inorganic binder ne-admixture.