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Fixed carbon (C) : 80% 53% porosity  
Wear rate of 0.35% or less 1.57 g/cm3 density  
Broken rate of more than 0.68% 0.947 g/cm3  
density Hydrochloric acid soluble rate 0.98% or less k80 non-uniform coefficient more than 2  
Sulfur content of 0.05% or less (S) copper content (Cu) more than 0.025%  
Zinc content 0.04% or less heavy metal content not more than other national standards for drinking water  
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