I-Gray iron investment castings yimikhiqizo yokusakazwa ethelwa inqubo yokufaka imali elahlekile ye-wax endaweni yensimbi. Insimbi empunga (noma insimbi empunga) iwuhlobo lwe-iron-carbon alloy (noma i-Ferrum-Carbon Alloy) ene-graphite microstructure. Iqanjwe ngombala ompunga we-fracture eyakhayo. 
