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It was made of delayed petroleum coke and coal tar pitch which was mixed and kneaded in the kneader, as raw materials. It is stable in quality with the features of low ash, good conductivity of electricity, strong mechanical strength, oxidation-resistant, etc...It is mainly used in the self-baked electrolysis cell of either side-inserting or top-inserting. It is shaped like a trapezium block which is black and weight 15kg.It can also be small piece of block. ITEM THY-1 THY-2 THY-3TypicalAsh,% ≤ 0.45 0.60 1.00 0.48 Electrical resistivity,m2/m ≤ 75 80 80 72 Compressive strength,Mpa ≥28 27 27 34 Apparent Density,g/cc ≥ 1.38 1.36 1.36 1.40 Real density,g/cc ≥ 1.98 1.98 1.98 1.99