Isafire enye yekristale yimathiriyeli enobunzima obuphezulu, uzinzo olugqwesileyo lweekhemikhali kunye nokukhanya okubonakalayo kuluhlu olubanzi lwamaza. Ngenxa yolu ncedo, isetyenziswa ngokubanzi kumashishini ahlukeneyo abandakanya ukhathalelo lwempilo, ubunjineli, ukubonelela ngomkhosi, ukuhamba ngenqwelomoya, i-optics.
Ukukhula kobubanzi obukhulu bekristale enye yesafire, iindlela zeKyropoulos (Ky) kunye neCzochralski (Cz) zisetyenziswa ikakhulu. Indlela ye-Cz yindlela esetyenziswa ngokubanzi yokukhula kwekristale enye apho i-alumina inyibilika kwi-crucible kwaye imbewu itsalwa phezulu; imbewu ijikeleziswa ngaxeshanye emva kokuqhagamshelana nomphezulu wesinyithi otyhidiweyo, kwaye indlela yeKy isetyenziselwa ukukhula kwekristale enye yobukhulu besafire enkulu. Nangona iziko layo elisisiseko lokukhula lifana nendlela ye-Cz, ikristale yembewu ayijikelezi emva kokuqhagamshelana ne-alumina etyhidiweyo, kodwa ihlisa ngokucothayo iqondo lobushushu ukuze ivumele ikristale enye ikhule ihle ukusuka kwikristale yembewu. Singasebenzisa iimveliso ezixhathisa ubushushu obuphezulu kwiziko lesafire, ezifana ne-tungsten crucible, i-molybdenum crucible, i-tungsten kunye ne-molybdenum ikhuselo lobushushu, i-tungsten yokufudumala i-tungsten kunye nezinye izinto ezikhethekileyo ze-tungsten kunye ne-molybdenum.
