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Quality standards for fuel oil: 1. In terms of fuel oil quality, density, viscosity, pour point, flash point, sulfur content, impurities, and carbon residue are important parameter indicators. 2. In international standards, high, medium, and low sulfur are defined as low sulfur when the sulfur content is 1 or less ； Sulfur content of 1-2 indicates medium sulfur level ； A sulfur content of 2 or above is the criterion for classifying as high-sulfur. 3. Excess sulfur content can result in the formation of sulfur-containing substances in the fuel oil, which are highly corrosive and cause air pollution, leading to negative environmental impacts. 4. According to international standards, the maximum sulfur content should not exceed 3.5. 5. The lower the density, the higher the proportion of light oils in the fuel oil, as well as its calorific value; therefore, a lower density is preferable according to the quality standards for fuel oil. 6. Under international standards, the density should not exceed 0.991. 7. What are the main metal components present in fuel oil? Steel, aluminum, and sodium 8. Excess metal content can lead to the formation of metal compounds after combustion, which can corrode equipment. 9. Classified by viscosity, the standards are 180# and 380#; the specific parameter is that the viscosity of 180# fuel oil should not exceed 180 ； The viscosity of 380# fuel oil should not exceed 380. 10. Please list some good indicators? Density below 0.96 √ Total metal content below 100 Viscosity below 170 √ Moisture below 0.1 Residual carbon below 10 Impurities 0.01 Flash point above 100 Ash content 0.1 Sulfur content below 3√