It is the byproduct when production of Fine coke， belongs to medium temperature coal tar. 1)Application：Making phthalic anhydride, colophony, engineering plastic, synthetic fibre, acridine,crude oil, artificial petroleum, and so on. 2)Medium temperature coal tar technical index: a) Density（20℃）＜１．１０×１０³kg/m³ b) Viscosity number/unit （１００℃）＜４.２°Ｅ c) Calorific value＞３６０００J/g d) Moisture content: About 4℅ e) Ash content＜０．５％ f）Mechanical impurity ＜０．５％ g) Sulphur content＜１％ h) Flash point＞１００ºC