Is the product of the distillation bottoms. As part of the fallout after the light. And high value, such as kerosene and diesel Distillate Fuels. By evaporation and condensation, until exhausted. For this reason, fuel oil, so called Residual Fuel (distillation residue) or Heavy Fuel Oils as a heavy and very viscous. It is not easy to use, with temperatures ranging from 371oC to 482oC boiling point, but it may have a low boiling point of 211oC - 371oC mixed with some oil sold in the United States, there are many kinds. Since the skin is very thick The mixed with the light to achieve the proper viscosity. The Ministry of Commerce has set up five types of fuel oil, which has a different viscosity is.
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