CST 180 specifies the following properties for diesel fuel oil:
* Cetane number: The cetane number is a measure of the ignition quality of diesel fuel. The higher the cetane number, the more easily the fuel ignites. The minimum cetane number for CST 180 is 40.
* Sulfur content: The sulfur content is a measure of the amount of sulfur in diesel fuel. Sulfur can cause damage to engines and is also a major contributor to air pollution. The maximum sulfur content for CST 180 is 0.05% by weight.
* Density: The density of diesel fuel is a measure of its weight per unit volume. The density of CST 180 is between 0.832 and 0.865 g/mL at 15°C.
* Flash point: The flash point is the temperature at which diesel fuel will ignite in the presence of an open flame. The minimum flash point for CST 180 is 52°C.
* Viscosity: The viscosity of diesel fuel is a measure of its resistance to flow. The viscosity of CST 180 is between 2.0 and 4.5 mm²/s at 40°C.
CST 180 is a widely used specification for diesel fuel oil in the United States and Canada. It is also used in some other countries around the world.
