metallurgy uses desulfurize , Best Price . HIGH QUALITY THE CALCIUM CARBIDE ; Chemistry formula : CaC2 , Color : Black brown ; Purity: 80% : SIZE: 4-7 MM , 7-15 MM , 15-25 MM , 25-50 MM , 50-80 MM , 70-100 MM , 80-120 MM ;GAS YIELD:295-305 L/KG ; PACKING: IN 50 GK AND 100 KG /NET NEW IRON DRUMS . CALCIUM CARBIDE FACTORY 50-80 MM