Diesel stability
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Diesel stability includes oxidative stability and color stability; what are the required specifications for each? Are the color requirements strict?
Oxidative stability should not exceed 2.5 mg/100 ml; this refers mainly to the total insoluble substances in diesel. Color stability should not exceed 3.5, and the requirements regarding color are quite strict
Quality specifications for diesel fuel GB 252-2000 – Quality specifications for light diesel fuel
Parameter: 10号, 5号, 0号, -10号, -20号, -35号, -50号
Colority, units: ≤ 3.5 (applicable to all grades)
Oxidation stability, total insoluble matter: mg/100mL ≤ 2.5
Sulfur content, % (m/m) ≤ 0.2
Acidity, mgKOH/100mL ≤ 7
Carbon residue from 10% distillate, % (m/m) ≤ 0.3
Ash content, % (m/m) ≤ 0.01
Copper sheet corrosion (50°C, 3 hours), grade ≤ 1
Moisture content, % (v/v) ≤ trace amounts
Mechanical impurities: none
Kinematic viscosity (20°C): mm²/s – 3.0 to 8.0 for grades 10, 5, 0, -10; 2.5 to 8.0 for grade -20; 1.8 to 7.0 for grades -35 and -50
Freezing point, °C ≤ 10 for grades 5, 0, -10, -20, -35, -50
GB 252-2000 – Quality specifications for light diesel fuel
Parameter: 10号, 5号, 0号, -10号, -20号, -35号, -50号
Cold filter plugging point, °C ≤ 12 for grades 10, 5, 0; ≤ 8 for grade 5; ≤ 4 for grades -5, -10, -20; ≤ -14 for grade -35; ≤ -29 for grade -50
Flash point (closed cup), °C ≥ 55 for all grades; 45 for grades 5 and -20
Cetane number ≥ 45 for all grades
Distillation range:
50% recovery temperature, °C ≤ 300 for all grades
90% recovery temperature, °C ≤ 365 for all grades
95% recovery temperature, °C ≤ 365 for all grades
Density (20°C), kg/m³: determined experimentally for all grades
Q/SHR 006-2000 – Quality specifications for diesel fuel used in urban vehicles
Parameter: Quality specifications
10号, 5号, 0号, -5号, -10号, -20号
Colority, units: ≤ 3.5 (applicable to all grades)
Oxidation stability, mg/100mL ≤ 2.5
Sulfur content, % (m/m) ≤ 0.05
Acidity, mgKOH/100mL ≤ 7
Carbon residue from 10% distillate, % (m/m) ≤ 0.3
Ash content, % (m/m) ≤ 0.01
Copper sheet corrosion (50°C, 3 hours), grade ≤ 1
Moisture content, % (v/v) ≤ trace amounts
Mechanical impurities: none
Kinematic viscosity (20°C), mm²/s – 3.0 to 8.0 for grades 10, 5, 0; 2.5 to 8.0 for grade -5; 1.8 to 7.0 for grades -10 and -20
Freezing point, °C ≤ 10 for grades 5, 0, -5, -10, -20
Cold filter plugging point, °C ≤ 12 for grade 10; ≤ 8 for grade 5; ≤ 4 for grade -5; ≤ -14 for grade -10
Flash point (closed cup), °C ≥ 55 for all grades
Cetane number ≥ 48 for all grades
Distillation range:
50% recovery temperature, °C ≤ 300 for all grades
90% recovery temperature, °C ≤ 355 for all grades
95% recovery temperature, °C ≤ 365 for all grades
Density (20°C), kg/m³: determined experimentally
Parameter: 10号, 5号, 0号, -10号, -20号, -35号, -50号
Colority, units: ≤ 3.5 (applicable to all grades)
Oxidation stability, total insoluble matter: mg/100mL ≤ 2.5
Sulfur content, % (m/m) ≤ 0.2
Acidity, mgKOH/100mL ≤ 7
Carbon residue from 10% distillate, % (m/m) ≤ 0.3
Ash content, % (m/m) ≤ 0.01
Copper sheet corrosion (50°C, 3 hours), grade ≤ 1
Moisture content, % (v/v) ≤ trace amounts
Mechanical impurities: none
Kinematic viscosity (20°C): mm²/s – 3.0 to 8.0 for grades 10, 5, 0, -10; 2.5 to 8.0 for grade -20; 1.8 to 7.0 for grades -35 and -50
Freezing point, °C ≤ 10 for grades 5, 0, -10, -20, -35, -50
GB 252-2000 – Quality specifications for light diesel fuel
Parameter: 10号, 5号, 0号, -10号, -20号, -35号, -50号
Cold filter plugging point, °C ≤ 12 for grades 10, 5, 0; ≤ 8 for grade 5; ≤ 4 for grades -5, -10, -20; ≤ -14 for grade -35; ≤ -29 for grade -50
Flash point (closed cup), °C ≥ 55 for all grades; 45 for grades 5 and -20
Cetane number ≥ 45 for all grades
Distillation range:
50% recovery temperature, °C ≤ 300 for all grades
90% recovery temperature, °C ≤ 365 for all grades
95% recovery temperature, °C ≤ 365 for all grades
Density (20°C), kg/m³: determined experimentally for all grades
Q/SHR 006-2000 – Quality specifications for diesel fuel used in urban vehicles
Parameter: Quality specifications
10号, 5号, 0号, -5号, -10号, -20号
Colority, units: ≤ 3.5 (applicable to all grades)
Oxidation stability, mg/100mL ≤ 2.5
Sulfur content, % (m/m) ≤ 0.05
Acidity, mgKOH/100mL ≤ 7
Carbon residue from 10% distillate, % (m/m) ≤ 0.3
Ash content, % (m/m) ≤ 0.01
Copper sheet corrosion (50°C, 3 hours), grade ≤ 1
Moisture content, % (v/v) ≤ trace amounts
Mechanical impurities: none
Kinematic viscosity (20°C), mm²/s – 3.0 to 8.0 for grades 10, 5, 0; 2.5 to 8.0 for grade -5; 1.8 to 7.0 for grades -10 and -20
Freezing point, °C ≤ 10 for grades 5, 0, -5, -10, -20
Cold filter plugging point, °C ≤ 12 for grade 10; ≤ 8 for grade 5; ≤ 4 for grade -5; ≤ -14 for grade -10
Flash point (closed cup), °C ≥ 55 for all grades
Cetane number ≥ 48 for all grades
Distillation range:
50% recovery temperature, °C ≤ 300 for all grades
90% recovery temperature, °C ≤ 355 for all grades
95% recovery temperature, °C ≤ 365 for all grades
Density (20°C), kg/m³: determined experimentally
The oxidative stability of diesel should be ≤2.5 mg/100 ml, with a color intensity requirement of no more than 3.5. Generally, oxidation stability analysis is complex and changes over time. Generally, colorimetry is strictly controlled.
The standard currently in use for light diesel products is GB 252-2000, the standard for Light Diesel. Under this standard, diesel is classified into grades 10, 5, 0, -10, -20, -35, and -50, with the grading being determined based on the diesel’s freezing point. On May 23, 2003, the standard GB/T 19147-2003 for diesel fuel for vehicles was issued; it is a recommended standard that came into effect on October 1, 2003. I don’t have the text for the specific metrics; only images are available, and they can’t be uploaded yet. If you need them, contact me on MSN: shawn_wang_82@hotmail.com