Anthracite is the highest rank coal and is characterized buy low volatile matter (always less than 10%) and high carbon content. It has a semi- metallic luster and is capable of burning without smoke. Semi- anthracite is coal midway between low volatile bituminous coal and anthracite. (1-6 �?�?) Ash content for dry condition no more than 4 % Volatile substances no more than 3 % Moisture no more than 9.5 % Lowest heat of combustion (GCF) at least 7,200 kcal/kg Total sulfur for dry condition no more than 1 % (0.2-1 �?�?) Ash content for dry condition no more than 30 % Volatile substances no more than 6 % Moisture no more than 10 % Lowest heat of combustion at least 5,000 kcal/kg Total sulfur for dry condition no more than 1 % (6-13 �?�?) Ash content for dry condition no more than 4 % Volatile substances no more than 4 % Moisture no more than 8 % Lowest heat of combustion at least 7,200 kcal/kg Total sulfur for dry condition no more than 1 % Trivia Content no more than 18 % (13-25 �?�?) Ash content for dry condition no more than 5 % Volatile substances no more than 3.5 % Moisture no more than 6.5 % Lowest heat of combustion at least 7,200 kcal/kg Total sulfur for dry condition no more than 1 % Trivia Content no more than 17 %
