|Test items||Meaning of test items|
|Flashing point (℃)||
Temperature for instantaneously lighting on and off when approaching the flame to the oil by heating oil products
Criteria for judging the degree of danger in fire when saving, delivering, and using oil products
|Coefficient of viscosity (50 ℃, mm2/s)||
Item for distinguishing the types of heavy oil
Related to the spraying feature of fuel. The lower the viscosity, the better the spraying feature is. It is also precisely sprayed accelerating heating and evaporation, reducing the delay of ignition, and hence improving combustion.
For the fuel sprayed by the spraying nozzle to be completely burnt, the efficacy of spraying shall be high. In addition, there is a need to maintain the viscosity in a certain level for this.
|Pour point (℃)||
The lowest temperature to maintain the flux status when being frozen
Viscosity increases when the temperature rapidly decreases in winter, and the wax content included in the fuel is emitted at the same time. Therefore, it blocks filter causing the fuel to be insufficiently supplied, lowering the spraying function, and badly influencing on the ignitionability and combustion.
Pour point is the feature that frequently becomes an issue in winter when transmitting the oil
|Remaining carbon (weight, %)||
Remaining carbon is the criterion for distinguishing combustion and is related to the amount of carbon
|Water and precipitate (volume %)||
If water is frozen below 0 ℃, fuel becomes oblique and frozen blocking the filter and causing problems on the devices using the fuel due to the corrosion of nozzle and fuel line
|Ash (weight, %)||
Left-over that is not burnt when completely burning the oil product
Metal becomes the oxide when it is burnt causing the abrasion on cylinder by producing deposit on the organization
|Sulfur content (weight, %)||
Cause the air pollution issues, deposit in the organization, and corrosion on the combustion system by SO2 occurring in the combustion