Diesel grades have an ASTM end point of 650-700°F. Diesel fuel is a blend of light and heavy distillates and has an ASTM boiling range of approximately 350-675°F. Marine diesels are a little heavier, having an ASTM boiling end point approximately 775°F. The most important specifications of diesel fuels are cetane number, sulfur, and pour or cloud point. Cetane number is related to the burning quality of the fuel in an engine. The permissible sulfur content of diesel is being lowered worldwide due to the environmental pollution concerns resulting from combustion of this fuel. Pour point or cloud point of diesel is related to the storage and handling properties of diesel and depends on the climatic conditions in which the fuel is being used.

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