Slag A fused nonmetallic material that protects molten metal from the air and extracts certain impurities from the melt. Casting surface imperfections similar to sand inclusions but containing impurities from the charge materials, silica and clay eroded from the refractory lining, and ash from the fuel during the melting process. May also originate from metal-refractory reactions occurring in the ladle during pouring of the casting. Slurry A flowable mixture of refractory particles suspended in a liquid. Test bar Standard specimen bar designed to permit determination of mechanical properties of the metal from which it was poured.
Test lug A lug cast as a part of the casting and later removed for testing purposes.
Vent An opening or passage in a mold or core to facilitate escape of gases when the mold is poured.