... appearing casting defects such as slag, gas, which is helpful for molten iron (steel) purification, improve castings quality, reduce casting ... , usually it can make the liquid iron cooling speed reduced by 20% - 30%.5. The slag is brittle, does not ... dry place, waterproof, moistureproof, ripstop. physical and chemical indexes (For casting iron using)Table 1: compositions compositions(element)loss on ...